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Title: JavaScript modules - JavaScript | MDN

Open Graph Title: JavaScript modules - JavaScript | MDN

Description: This guide gives you all you need to get started with JavaScript module syntax.

Open Graph Description: This guide gives you all you need to get started with JavaScript module syntax.

Opengraph URL: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

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Domain: developer.mozilla.org

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Skip to main contenthttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#content
Skip to searchhttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#search
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HTML: Markup languagehttps://developer.mozilla.org/en-US/docs/Web/HTML
Elementshttps://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements
Global attributeshttps://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Global_attributes
Attributeshttps://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes
See all…https://developer.mozilla.org/en-US/docs/Web/HTML/Reference
Responsive imageshttps://developer.mozilla.org/en-US/docs/Web/HTML/Guides/Responsive_images
HTML cheatsheethttps://developer.mozilla.org/en-US/docs/Web/HTML/Guides/Cheatsheet
Date & time formatshttps://developer.mozilla.org/en-US/docs/Web/HTML/Guides/Date_and_time_formats
See all…https://developer.mozilla.org/en-US/docs/Web/HTML/Guides
SVGhttps://developer.mozilla.org/en-US/docs/Web/SVG
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XMLhttps://developer.mozilla.org/en-US/docs/Web/XML
CSS: Styling languagehttps://developer.mozilla.org/en-US/docs/Web/CSS
Propertieshttps://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties
Selectorshttps://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors
At-ruleshttps://developer.mozilla.org/en-US/docs/Web/CSS/Reference/At-rules
Valueshttps://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values
See all…https://developer.mozilla.org/en-US/docs/Web/CSS/Reference
Box modelhttps://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Box_model/Introduction
Animationshttps://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Animations/Using
Flexboxhttps://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Flexible_box_layout/Basic_concepts
Colorshttps://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Colors/Applying_color
See all…https://developer.mozilla.org/en-US/docs/Web/CSS/Guides
Column layoutshttps://developer.mozilla.org/en-US/docs/Web/CSS/How_to/Layout_cookbook/Column_layouts
Centering an elementhttps://developer.mozilla.org/en-US/docs/Web/CSS/How_to/Layout_cookbook/Center_an_element
Card componenthttps://developer.mozilla.org/en-US/docs/Web/CSS/How_to/Layout_cookbook/Card
See all…https://developer.mozilla.org/en-US/docs/Web/CSS/How_to/Layout_cookbook
JavaScript: Scripting languagehttps://developer.mozilla.org/en-US/docs/Web/JavaScript
Standard built-in objectshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects
Expressions & operatorshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators
Statements & declarationshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements
Functionshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions
See all…https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference
Control flow & error handinghttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Control_flow_and_error_handling
Loops and iterationhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration
Working with objectshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_objects
Using classeshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_classes
See all…https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide
Web APIs: Programming interfaceshttps://developer.mozilla.org/en-US/docs/Web/API
File system APIhttps://developer.mozilla.org/en-US/docs/Web/API/File_System_API
Fetch APIhttps://developer.mozilla.org/en-US/docs/Web/API/Fetch_API
Geolocation APIhttps://developer.mozilla.org/en-US/docs/Web/API/Geolocation_API
HTML DOM APIhttps://developer.mozilla.org/en-US/docs/Web/API/HTML_DOM_API
Push APIhttps://developer.mozilla.org/en-US/docs/Web/API/Push_API
Service worker APIhttps://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API
See all…https://developer.mozilla.org/en-US/docs/Web/API
Using the Web animation APIhttps://developer.mozilla.org/en-US/docs/Web/API/Web_Animations_API/Using_the_Web_Animations_API
Using the Fetch APIhttps://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
Working with the History APIhttps://developer.mozilla.org/en-US/docs/Web/API/History_API/Working_with_the_History_API
Using the Web speech APIhttps://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_API/Using_the_Web_Speech_API
Using web workershttps://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers
All web technologyhttps://developer.mozilla.org/en-US/docs/Web
Accessibilityhttps://developer.mozilla.org/en-US/docs/Web/Accessibility
HTTPhttps://developer.mozilla.org/en-US/docs/Web/HTTP
URIhttps://developer.mozilla.org/en-US/docs/Web/URI
Web extensionshttps://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions
WebAssemblyhttps://developer.mozilla.org/en-US/docs/WebAssembly
WebDriverhttps://developer.mozilla.org/en-US/docs/Web/WebDriver
See all…https://developer.mozilla.org/en-US/docs/Web
Mediahttps://developer.mozilla.org/en-US/docs/Web/Media
Performancehttps://developer.mozilla.org/en-US/docs/Web/Performance
Privacyhttps://developer.mozilla.org/en-US/docs/Web/Privacy
Securityhttps://developer.mozilla.org/en-US/docs/Web/Security
Progressive web appshttps://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps
Learn web developmenthttps://developer.mozilla.org/en-US/docs/Learn_web_development
Getting started moduleshttps://developer.mozilla.org/en-US/docs/Learn_web_development/Getting_started
Core moduleshttps://developer.mozilla.org/en-US/docs/Learn_web_development/Core
MDN Curriculumhttps://developer.mozilla.org/en-US/curriculum/
Structuring content with HTML modulehttps://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Structuring_content
CSS styling basics modulehttps://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Styling_basics
CSS layout modulehttps://developer.mozilla.org/en-US/docs/Learn_web_development/Core/CSS_layout
Dynamic scripting with JavaScript modulehttps://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Scripting
Playgroundhttps://developer.mozilla.org/en-US/play
HTTP Observatoryhttps://developer.mozilla.org/en-US/observatory
Border-image generatorhttps://developer.mozilla.org/en-US/docs/Web/CSS/CSS_backgrounds_and_borders/Border-image_generator
Border-radius generatorhttps://developer.mozilla.org/en-US/docs/Web/CSS/CSS_backgrounds_and_borders/Border-radius_generator
Box-shadow generatorhttps://developer.mozilla.org/en-US/docs/Web/CSS/CSS_backgrounds_and_borders/Box-shadow_generator
Color format converterhttps://developer.mozilla.org/en-US/docs/Web/CSS/CSS_colors/Color_format_converter
Color mixerhttps://developer.mozilla.org/en-US/docs/Web/CSS/CSS_colors/Color_mixer
Shape generatorhttps://developer.mozilla.org/en-US/docs/Web/CSS/CSS_shapes/Shape_generator
About MDNhttps://developer.mozilla.org/en-US/about
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MDN on GitHubhttps://github.com/mdn
Bloghttps://developer.mozilla.org/en-US/blog/
Webhttps://developer.mozilla.org/en-US/docs/Web
JavaScripthttps://developer.mozilla.org/en-US/docs/Web/JavaScript
Guidehttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide
JavaScript moduleshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
https://github.com/orgs/mdn/discussions/739
https://developer.mozilla.org/de/docs/Web/JavaScript/Guide/Modules
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
https://developer.mozilla.org/es/docs/Web/JavaScript/Guide/Modules
https://developer.mozilla.org/fr/docs/Web/JavaScript/Guide/Modules
https://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/Modules
https://developer.mozilla.org/ko/docs/Web/JavaScript/Guide/Modules
https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Guide/Modules
https://developer.mozilla.org/ru/docs/Web/JavaScript/Guide/Modules
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Modules
Previous https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Internationalization
A background on moduleshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#a_background_on_modules
Introducing an examplehttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#introducing_an_example
Basic example structurehttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#basic_example_structure
Exporting module featureshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#exporting_module_features
Importing features into your scripthttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#importing_features_into_your_script
Importing modules using import mapshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#importing_modules_using_import_maps
Loading non-JavaScript resourceshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#loading_non-javascript_resources
Applying the module to your HTMLhttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#applying_the_module_to_your_html
Other differences between modules and classic scriptshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#other_differences_between_modules_and_classic_scripts
Default exports versus named exportshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#default_exports_versus_named_exports
Avoiding naming conflictshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#avoiding_naming_conflicts
Renaming imports and exportshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#renaming_imports_and_exports
Creating a module objecthttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#creating_a_module_object
Modules and classeshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#modules_and_classes
Aggregating moduleshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#aggregating_modules
Dynamic module loadinghttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#dynamic_module_loading
Top level awaithttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#top_level_await
Import declarations are hoistedhttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#import_declarations_are_hoisted
Cyclic importshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#cyclic_imports
Authoring "isomorphic" moduleshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#authoring_isomorphic_modules
Troubleshootinghttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#troubleshooting
See alsohttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#see_also
A background on moduleshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#a_background_on_modules
Node.jshttps://developer.mozilla.org/en-US/docs/Glossary/Node.js
CommonJShttps://en.wikipedia.org/wiki/CommonJS
AMDhttps://github.com/amdjs/amdjs-api/blob/master/AMD.md
RequireJShttps://requirejs.org/
webpackhttps://webpack.js.org/
Babelhttps://babeljs.io/
Introducing an examplehttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#introducing_an_example
set of exampleshttps://github.com/mdn/js-examples/tree/main/module-examples
https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/canvas
Basic example structurehttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#basic_example_structure
basic-moduleshttps://github.com/mdn/js-examples/tree/main/module-examples/basic-modules
https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/div
Aside — .mjs versus .jshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#aside_—_.mjs_versus_.js
V8's documentation recommends thishttps://v8.dev/features/modules#mjs
Node.jshttps://nodejs.org/api/esm.html#esm_enabling
Babelhttps://babeljs.io/docs/options#sourcetype
GitHub Pageshttps://pages.github.com/
http-serverhttps://github.com/http-party/http-server#readme
Content-Typehttps://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Type
Exporting module featureshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#exporting_module_features
exporthttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/export
Importing features into your scripthttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#importing_features_into_your_script
importhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import
main.jshttps://github.com/mdn/js-examples/blob/main/module-examples/basic-modules/main.js
import maphttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#importing_modules_using_import_maps
import referencehttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#imported_values_can_only_be_modified_by_the_exporter
Importing modules using import mapshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#importing_modules_using_import_maps
Import mapshttps://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/script/type/importmap
base URLhttps://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/base
JSON objecthttps://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/script/type/importmap#import_map_json_representation
importmaphttps://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/script/type/importmap
Feature detectionhttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#feature_detection
HTMLScriptElement.supports()https://developer.mozilla.org/en-US/docs/Web/API/HTMLScriptElement/supports_static
Importing modules as bare nameshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#importing_modules_as_bare_names
Remapping module pathshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#remapping_module_paths
Scoped modules for version managementhttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#scoped_modules_for_version_management
Improve caching by mapping away hashed filenameshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#improve_caching_by_mapping_away_hashed_filenames
Loading non-JavaScript resourceshttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#loading_non-javascript_resources
CSSStyleSheethttps://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet
import attributeshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import/with
Applying the module to your HTMLhttps://developer.mozilla.org/docs/Web/JavaScript/Guide/Modules#applying_the_module_to_your_html