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https://nodejs-api-docs-tooling.vercel.app/assert.html#strict-assertion-mode Message parameter semantics https://nodejs-api-docs-tooling.vercel.app/assert.html#message-parameter-semantics Legacy assertion mode https://nodejs-api-docs-tooling.vercel.app/assert.html#legacy-assertion-mode assert.AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror new assert.AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#new-assertassertionerroroptions assert.Assert https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassert new assert.Assert https://nodejs-api-docs-tooling.vercel.app/assert.html#new-assertassertoptions assert https://nodejs-api-docs-tooling.vercel.app/assert.html#assertvalue-message assert.deepEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepequalactual-expected-message Comparison details https://nodejs-api-docs-tooling.vercel.app/assert.html#comparison-details assert.deepStrictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepstrictequalactual-expected-message Comparison details https://nodejs-api-docs-tooling.vercel.app/assert.html#comparison-details-1 assert.doesNotMatch https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotmatchstring-regexp-message assert.doesNotReject https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotrejectasyncfn-error-message assert.doesNotThrow https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotthrowfn-error-message assert.equal https://nodejs-api-docs-tooling.vercel.app/assert.html#assertequalactual-expected-message assert.fail https://nodejs-api-docs-tooling.vercel.app/assert.html#assertfailmessage assert.ifError https://nodejs-api-docs-tooling.vercel.app/assert.html#assertiferrorvalue assert.match https://nodejs-api-docs-tooling.vercel.app/assert.html#assertmatchstring-regexp-message assert.notDeepEqual 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Comparison details https://nodejs-api-docs-tooling.vercel.app/assert.html#comparison-details-2 Assert https://nodejs-api-docs-tooling.vercel.app/assert.html#assert lib/assert.js https://github.com/nodejs/node/blob/main/lib/assert.js Strict assertion mode https://nodejs-api-docs-tooling.vercel.app/assert.html#strict-assertion-mode Exposed as require('node:assert/strict').v15.0.0 https://github.com/nodejs/node/pull/34001 Changed "strict mode" to "strict assertion mode" and "legacy mode" to "legacy assertion mode" to avoid confusion with the more usual meaning of "strict mode".v13.9.0, v12.16.2 https://github.com/nodejs/node/pull/31635 Added error diffs to the strict assertion mode.v9.9.0 https://github.com/nodejs/node/pull/17615 Added strict assertion mode to the assert module.v9.9.0 https://github.com/nodejs/node/pull/17002 assert.deepEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepequalactual-expected-message assert.deepStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepstrictequalactual-expected-message Message parameter semantics https://nodejs-api-docs-tooling.vercel.app/assert.html#message-parameter-semantics util.format() https://nodejs-api-docs-tooling.vercel.app/util.html#utilformatformat-args getColorDepth() https://nodejs-api-docs-tooling.vercel.app/tty.html#writestreamgetcolordepthenv Legacy assertion mode https://nodejs-api-docs-tooling.vercel.app/assert.html#legacy-assertion-mode == operator https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality assert.deepEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepequalactual-expected-message assert.equal() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertequalactual-expected-message assert.notDeepEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotdeepequalactual-expected-message assert.notEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotequalactual-expected-message assert.deepEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepequalactual-expected-message assert.AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.AssertionError Constructor https://nodejs-api-docs-tooling.vercel.app/assert.html#new-assertassertionerroroptions https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types assert.strictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertstrictequalactual-expected-message https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types assert.strictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertstrictequalactual-expected-message https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#boolean_type https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type assert.Assert https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassert assert.Assert Constructor https://nodejs-api-docs-tooling.vercel.app/assert.html#new-assertassertoptions Added skipPrototype option.v24.9.0 https://github.com/nodejs/node/pull/59762 https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#boolean_type https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#boolean_type assert https://nodejs-api-docs-tooling.vercel.app/assert.html#assertvalue-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function assert.ok() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertokvalue-message assert.deepEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepequalactual-expected-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 Promises are not considered equal anymore if they are not of the same instance.v25.0.0 https://github.com/nodejs/node/pull/59448 Invalid dates are now considered equal.v25.0.0 https://github.com/nodejs/node/pull/57627 Recursion now stops when either side encounters a circular reference.v24.0.0 https://github.com/nodejs/node/pull/57622 Error cause and errors properties are now compared as well.v22.2.0, v20.15.0 https://github.com/nodejs/node/pull/51805 Regular expressions lastIndex property is now compared as well.v18.0.0 https://github.com/nodejs/node/pull/41020 In Legacy assertion mode, changed status from Deprecated to Legacy.v16.0.0, v14.18.0 https://github.com/nodejs/node/pull/38113 NaN is now treated as being identical if both sides are NaN.v14.0.0 https://github.com/nodejs/node/pull/30766 The type tags are now properly compared and there are a couple minor comparison adjustments to make the check less surprising.v12.0.0 https://github.com/nodejs/node/pull/25008 The Error names and messages are now properly compared.v9.0.0 https://github.com/nodejs/node/pull/15001 The Set and Map content is also compared.v8.0.0 https://github.com/nodejs/node/pull/12142 Typed array slices are handled correctly now.v6.4.0, v4.7.1 https://github.com/nodejs/node/pull/8002 Objects with circular references can be used as inputs now.v6.1.0, v4.5.0 https://github.com/nodejs/node/pull/6432 Handle non-Uint8Array typed arrays correctly.v5.10.1, v4.4.3 https://github.com/nodejs/node/pull/5910 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function assert.deepStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepstrictequalactual-expected-message assert.deepStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepstrictequalactual-expected-message assert.deepStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepstrictequalactual-expected-message assert.deepEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepequalactual-expected-message Comparison details https://nodejs-api-docs-tooling.vercel.app/assert.html#comparison-details == operator https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/NaN https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/NaN Type tags https://tc39.github.io/ecma262/#sec-object.prototype.tostring enumerable "own" properties https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Enumerability_and_ownership_of_properties https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error Object wrappers https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Data_structures#primitive_values https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Set [[Prototype]] https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#symbol_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WeakMap https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WeakSet https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror == operator https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.deepStrictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepstrictequalactual-expected-message Message may now be a printf-like format string or function.v25.1.0 https://github.com/nodejs/node/pull/58849 Promises are not considered equal anymore if they are not of the same instance.v25.0.0 https://github.com/nodejs/node/pull/59448 Invalid dates are now considered equal.v25.0.0 https://github.com/nodejs/node/pull/57627 Recursion now stops when either side encounters a circular reference.v24.0.0 https://github.com/nodejs/node/pull/57622 Error cause and errors properties are now compared as well.v22.2.0, v20.15.0 https://github.com/nodejs/node/pull/51805 Regular expressions lastIndex property is now compared as well.v18.0.0 https://github.com/nodejs/node/pull/41020 Enumerable symbol properties are now compared.v9.0.0 https://github.com/nodejs/node/pull/15169 https://github.com/nodejs/node/pull/15036 https://github.com/nodejs/node/pull/15036 The NaN is now compared using the https://github.com/nodejs/node/pull/15036 SameValueZero https://tc39.github.io/ecma262/#sec-samevaluezero The Error names and messages are now properly compared.v8.5.0 https://github.com/nodejs/node/pull/15001 The Set and Map content is also compared.v8.0.0 https://github.com/nodejs/node/pull/12142 Typed array slices are handled correctly now.v6.4.0, v4.7.1 https://github.com/nodejs/node/pull/8002 Objects with circular references can be used as inputs now.v6.1.0 https://github.com/nodejs/node/pull/6432 Handle non-Uint8Array typed arrays correctly.v5.10.1, v4.4.3 https://github.com/nodejs/node/pull/5910 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function Comparison details https://nodejs-api-docs-tooling.vercel.app/assert.html#comparison-details-1 Object.is() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is Type tags https://tc39.github.io/ecma262/#sec-object.prototype.tostring [[Prototype]] https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots === operator https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality enumerable "own" properties https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Enumerability_and_ownership_of_properties https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#symbol_type Object wrappers https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Data_structures#primitive_values https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Set https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WeakMap https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WeakSet https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error assert.doesNotMatch https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotmatchstring-regexp-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 This API is no longer experimental.v16.0.0 https://github.com/nodejs/node/pull/38111 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.doesNotReject https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotrejectasyncfn-error-message https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise ERR_INVALID_RETURN_VALUE https://nodejs-api-docs-tooling.vercel.app/errors.html#err_invalid_return_value Class https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp assert.throws() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertthrowsfn-error-message assert.doesNotThrow() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotthrowfn-error-message assert.doesNotThrow https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotthrowfn-error-message The message parameter is respected now.v5.11.0, v4.4.5 https://github.com/nodejs/node/pull/2407 The error parameter can now be an arrow function.v4.2.0 https://github.com/nodejs/node/pull/3276 https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror Class https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp assert.throws() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertthrowsfn-error-message https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/TypeError AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.equal https://nodejs-api-docs-tooling.vercel.app/assert.html#assertequalactual-expected-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 In Legacy assertion mode, changed status from Deprecated to Legacy.v16.0.0, v14.18.0 https://github.com/nodejs/node/pull/38113 NaN is now treated as being identical if both sides are NaN.v14.0.0 https://github.com/nodejs/node/pull/30766 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function assert.strictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertstrictequalactual-expected-message assert.strictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertstrictequalactual-expected-message == operator https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error assert.fail https://nodejs-api-docs-tooling.vercel.app/assert.html#assertfailmessage https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.ifError https://nodejs-api-docs-tooling.vercel.app/assert.html#assertiferrorvalue Instead of throwing the original error it is now wrapped into an [AssertionError][] that contains the full stack trace.v10.0.0 https://github.com/nodejs/node/pull/18247 Value may now only be undefined or null. Before all falsy values were handled the same as null and did not throw.v10.0.0 https://github.com/nodejs/node/pull/18247 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types assert.match https://nodejs-api-docs-tooling.vercel.app/assert.html#assertmatchstring-regexp-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 This API is no longer experimental.v16.0.0 https://github.com/nodejs/node/pull/38111 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.notDeepEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotdeepequalactual-expected-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 In Legacy assertion mode, changed status from Deprecated to Legacy.v16.0.0, v14.18.0 https://github.com/nodejs/node/pull/38113 NaN is now treated as being identical if both sides are NaN.v14.0.0 https://github.com/nodejs/node/pull/30766 The Error names and messages are now properly compared.v9.0.0 https://github.com/nodejs/node/pull/15001 The Set and Map content is also compared.v8.0.0 https://github.com/nodejs/node/pull/12142 Typed array slices are handled correctly now.v6.4.0, v4.7.1 https://github.com/nodejs/node/pull/8002 Objects with circular references can be used as inputs now.v6.1.0, v4.5.0 https://github.com/nodejs/node/pull/6432 Handle non-Uint8Array typed arrays correctly.v5.10.1, v4.4.3 https://github.com/nodejs/node/pull/5910 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function assert.notDeepStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotdeepstrictequalactual-expected-message assert.notDeepStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotdeepstrictequalactual-expected-message assert.deepEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepequalactual-expected-message AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error assert.notDeepStrictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotdeepstrictequalactual-expected-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 The -0 and +0 are not considered equal anymore.v9.0.0 https://github.com/nodejs/node/pull/15398 https://github.com/nodejs/node/pull/15036 https://github.com/nodejs/node/pull/15036 The NaN is now compared using the https://github.com/nodejs/node/pull/15036 SameValueZero https://tc39.github.io/ecma262/#sec-samevaluezero The Error names and messages are now properly compared.v9.0.0 https://github.com/nodejs/node/pull/15001 The Set and Map content is also compared.v8.0.0 https://github.com/nodejs/node/pull/12142 Typed array slices are handled correctly now.v6.4.0, v4.7.1 https://github.com/nodejs/node/pull/8002 Objects with circular references can be used as inputs now.v6.1.0 https://github.com/nodejs/node/pull/6432 Handle non-Uint8Array typed arrays correctly.v5.10.1, v4.4.3 https://github.com/nodejs/node/pull/5910 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function assert.deepStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepstrictequalactual-expected-message AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.notEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotequalactual-expected-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 In Legacy assertion mode, changed status from Deprecated to Legacy.v16.0.0, v14.18.0 https://github.com/nodejs/node/pull/38113 NaN is now treated as being identical if both sides are NaN.v14.0.0 https://github.com/nodejs/node/pull/30766 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function assert.notStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotstrictequalactual-expected-message assert.notStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotstrictequalactual-expected-message != operator https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Inequality AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error assert.notStrictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotstrictequalactual-expected-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 Used comparison changed from Strict Equality to Object.is().v10.0.0 https://github.com/nodejs/node/pull/17003 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function Object.is() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error assert.ok https://nodejs-api-docs-tooling.vercel.app/assert.html#assertokvalue-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 The assert.ok() (no arguments) will now use a predefined error message.v10.0.0 https://github.com/nodejs/node/pull/18319 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error assert.rejects https://nodejs-api-docs-tooling.vercel.app/assert.html#assertrejectsasyncfn-error-message https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise ERR_INVALID_RETURN_VALUE https://nodejs-api-docs-tooling.vercel.app/errors.html#err_invalid_return_value assert.throws() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertthrowsfn-error-message Class https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.throws() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertthrowsfn-error-message assert.strictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertstrictequalactual-expected-message Message may now be a printf-like format string or function.v26.0.0 https://github.com/nodejs/node/pull/58849 Used comparison changed from Strict Equality to Object.is().v10.0.0 https://github.com/nodejs/node/pull/17003 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function Object.is() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.throws https://nodejs-api-docs-tooling.vercel.app/assert.html#assertthrowsfn-error-message The error parameter can be an object containing regular expressions now.v10.2.0 https://github.com/nodejs/node/pull/20485 The error parameter can now be an object as well.v9.9.0 https://github.com/nodejs/node/pull/17584 The error parameter can now be an arrow function.v4.2.0 https://github.com/nodejs/node/pull/3276 https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type Class https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror assert.partialDeepStrictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertpartialdeepstrictequalactual-expected-message Promises are not considered equal anymore if they are not of the same instance.v25.0.0 https://github.com/nodejs/node/pull/59448 Invalid dates are now considered equal.v25.0.0 https://github.com/nodejs/node/pull/57627 partialDeepStrictEqual is now Stable. Previously, it had been Experimental.v24.0.0, v22.17.0 https://github.com/nodejs/node/pull/57370 https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#Data_types https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#string_type https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function assert.deepStrictEqual() https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepstrictequalactual-expected-message Comparison details https://nodejs-api-docs-tooling.vercel.app/assert.html#comparison-details-2 Object.is() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is Type tags https://tc39.github.io/ecma262/#sec-object.prototype.tostring [[Prototype]] https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots enumerable "own" properties https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Enumerability_and_ownership_of_properties https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error https://developer.mozilla.org/docs/Web/JavaScript/Data_structures#symbol_type Object wrappers https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Data_structures#primitive_values https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Map https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Set https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WeakMap https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WeakSet https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/RegExp JSON https://nodejs-api-docs-tooling.vercel.app/assert.json MD https://nodejs-api-docs-tooling.vercel.app/assert.md Edit this page https://github.com/nodejs/node/edit/HEAD/doc/api/assert.md Strict assertion mode https://nodejs-api-docs-tooling.vercel.app/assert.html#strict-assertion-mode Message parameter semantics https://nodejs-api-docs-tooling.vercel.app/assert.html#message-parameter-semantics Legacy assertion mode https://nodejs-api-docs-tooling.vercel.app/assert.html#legacy-assertion-mode assert.AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassertionerror new assert.AssertionError https://nodejs-api-docs-tooling.vercel.app/assert.html#new-assertassertionerroroptions assert.Assert https://nodejs-api-docs-tooling.vercel.app/assert.html#class-assertassert new assert.Assert https://nodejs-api-docs-tooling.vercel.app/assert.html#new-assertassertoptions assert https://nodejs-api-docs-tooling.vercel.app/assert.html#assertvalue-message assert.deepEqualL https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepequalactual-expected-message Comparison details https://nodejs-api-docs-tooling.vercel.app/assert.html#comparison-details assert.deepStrictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdeepstrictequalactual-expected-message Comparison details https://nodejs-api-docs-tooling.vercel.app/assert.html#comparison-details-1 assert.doesNotMatch https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotmatchstring-regexp-message assert.doesNotReject https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotrejectasyncfn-error-message assert.doesNotThrow https://nodejs-api-docs-tooling.vercel.app/assert.html#assertdoesnotthrowfn-error-message assert.equalL https://nodejs-api-docs-tooling.vercel.app/assert.html#assertequalactual-expected-message assert.fail https://nodejs-api-docs-tooling.vercel.app/assert.html#assertfailmessage assert.ifError https://nodejs-api-docs-tooling.vercel.app/assert.html#assertiferrorvalue assert.match https://nodejs-api-docs-tooling.vercel.app/assert.html#assertmatchstring-regexp-message assert.notDeepEqualL https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotdeepequalactual-expected-message assert.notDeepStrictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotdeepstrictequalactual-expected-message assert.notEqualL https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotequalactual-expected-message assert.notStrictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertnotstrictequalactual-expected-message assert.ok https://nodejs-api-docs-tooling.vercel.app/assert.html#assertokvalue-message assert.rejects https://nodejs-api-docs-tooling.vercel.app/assert.html#assertrejectsasyncfn-error-message assert.strictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertstrictequalactual-expected-message assert.throws https://nodejs-api-docs-tooling.vercel.app/assert.html#assertthrowsfn-error-message assert.partialDeepStrictEqual https://nodejs-api-docs-tooling.vercel.app/assert.html#assertpartialdeepstrictequalactual-expected-message Comparison details https://nodejs-api-docs-tooling.vercel.app/assert.html#comparison-details-2