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Title: GitHub - jet/FsCodec: F# Event-Union Contract Encoding with versioning tolerant converters supporting System.Text.Json and Newtonsoft.Json

Open Graph Title: GitHub - jet/FsCodec: F# Event-Union Contract Encoding with versioning tolerant converters supporting System.Text.Json and Newtonsoft.Json

X Title: GitHub - jet/FsCodec: F# Event-Union Contract Encoding with versioning tolerant converters supporting System.Text.Json and Newtonsoft.Json

Description: F# Event-Union Contract Encoding with versioning tolerant converters supporting System.Text.Json and Newtonsoft.Json - jet/FsCodec

Open Graph Description: F# Event-Union Contract Encoding with versioning tolerant converters supporting System.Text.Json and Newtonsoft.Json - jet/FsCodec

X Description: F# Event-Union Contract Encoding with versioning tolerant converters supporting System.Text.Json and Newtonsoft.Json - jet/FsCodec

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	https://dev.azure.com/jet-opensource/opensource/_build/latest?definitionId=18?branchName=master
	https://github.com/jet/fscodec/releases
	https://www.nuget.org/packages/FsCodec
	https://patch-diff.githubusercontent.com/jet/FsCodec/blob/master/LICENSE
applications	https://github.com/jet/dotnet-templates
Equinox	https://github.com/jet/equinox
Propulsion	https://github.com/jet/propulsion
	https://patch-diff.githubusercontent.com/jet/FsCodec#components
	https://www.nuget.org/packages/FsCodec/
FsCodec.IEventCodec	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L19
FsCodec.Codec	https://github.com/jet/FsCodec/blob/master/src/FsCodec/Codec.fs#L5
FsCodec.StreamName	https://github.com/jet/FsCodec/blob/master/src/FsCodec/StreamName.fs
FsCodec.StreamId	https://github.com/jet/FsCodec/blob/master/src/FsCodec/StreamId.fs
	https://www.nuget.org/packages/FsCodec.Box/
FsCodec.Box.Codec	https://patch-diff.githubusercontent.com/jet/FsCodec#boxcodec
Equinox.MemoryStore	https://www.fuget.org/packages/Equinox.MemoryStore
depends	https://www.fuget.org/packages/FsCodec.Box
	https://www.nuget.org/packages/FsCodec.NewtonsoftJson/
a scheme for the serializing Events modelled as an F# Discriminated Union	https://eiriktsarpalis.wordpress.com/2018/10/30/a-contract-pattern-for-schemaless-datastores/
TypeShape	https://github.com/eiriktsarpalis/TypeShape
UnionContractEncoder	https://eiriktsarpalis.wordpress.com/2018/10/30/a-contract-pattern-for-schemaless-datastores
Newtonsoft.Json	https://github.com/JamesNK/Newtonsoft.Json
depends	https://www.fuget.org/packages/FsCodec.NewtonsoftJson
	https://www.nuget.org/packages/FsCodec.SystemTextJson/
#38	https://github.com/jet/FsCodec/pulls/38
depends	https://www.fuget.org/packages/FsCodec.SystemTextJson
	https://patch-diff.githubusercontent.com/jet/FsCodec#features-fscodec
FsCodec.IEventData	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L4
FsCodec.ITimelineEvent	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L23
FsCodec.IEventCodec	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L31
FsCodec.Codec.Create	https://github.com/jet/FsCodec/blob/master/src/FsCodec/Codec.fs#L27
FsCodec.Core.EventData.Create	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L44
FsCodec.Core.TimelineEvent.Create	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L58
	https://patch-diff.githubusercontent.com/jet/FsCodec#features-fscodecnewtonsoftsystemtextjson
	https://patch-diff.githubusercontent.com/jet/FsCodec#common-api
	https://patch-diff.githubusercontent.com/jet/FsCodec#codec
FsCodec.NewtonsoftJson/SystemTextJson.Codec	https://github.com/jet/FsCodec/blob/master/src/FsCodec.NewtonsoftJson/Codec.fs
a scheme for the serializing Events modelled as an F# Discriminated Union	https://eiriktsarpalis.wordpress.com/2018/10/30/a-contract-pattern-for-schemaless-datastores/
	https://patch-diff.githubusercontent.com/jet/FsCodec#converters-newtonsoftjsonconverters--systemtextjsonserializationjsonconverters
	https://patch-diff.githubusercontent.com/jet/FsCodec#explicit-vs-implicit
recommendations	https://patch-diff.githubusercontent.com/jet/FsCodec#recommendations
Equinox's module Aggregate documentation	https://github.com/jet/equinox/blob/master/DOCUMENTATION.md#aggregate-module
	https://patch-diff.githubusercontent.com/jet/FsCodec#this-set-might-be-all-you-need-
JsonIsomorphism	https://patch-diff.githubusercontent.com/jet/FsCodec#jsonisimorphism
recommendations	https://patch-diff.githubusercontent.com/jet/FsCodec#recommendations
Anti Corruption Layer	https://docs.microsoft.com/en-us/azure/architecture/patterns/anti-corruption-layer
event versioning	https://leanpub.com/esversioning
	https://patch-diff.githubusercontent.com/jet/FsCodec#-but-dont-forget-fsharpsystemtextjson
Version 6 added support for F# options, lists, Set and Map out of the box	https://github.com/dotnet/runtime/pull/55108
removal of the JsonOptionConverter that once lived here	https://github.com/jet/FsCodec/pull/68
open issue on the System.Text.Json repo wrt supporting F# Unions	https://github.com/dotnet/runtime/issues/55744
the advice for FsCodec.NewtonsoftJson has always been to avoid stuff outside of records, options and arrays	https://patch-diff.githubusercontent.com/jet/FsCodec#recommendations
FSharp.SystemTextJson	https://github.com/Tarmil/FSharp.SystemTextJson
In general, there should be a smooth path to transition from using FsCodec to that as and when needed	https://github.com/jet/FsCodec/pull/69#issuecomment-1006532703
	https://patch-diff.githubusercontent.com/jet/FsCodec#core-converters
TypeSafeEnumConverter	https://github.com/jet/FsCodec/blob/master/src/FsCodec.SystemTextJson/TypeSafeEnumConverter.fs
@amjjd	https://github.com/amjjd
UnionConverter	https://github.com/jet/FsCodec/blob/master/src/FsCodec.SystemTextJson/UnionConverter.fs#L23
@amjdd	https://github.com/amjjd
@NickDarvey	https://github.com/NickDarvey
FSharp.SystemTextJson	https://github.com/Tarmil/FSharp.SystemTextJson
	https://patch-diff.githubusercontent.com/jet/FsCodec#custom-converter-base-classes
JsonIsomorphism	https://github.com/jet/FsCodec/blob/master/src/FsCodec.NewtonsoftJson/Pickler.fs#L49
@EirikTsarpalis	https://github.com/eiriktsarpalis
JsonPickler	https://github.com/jet/FsCodec/blob/master/src/FsCodec.NewtonsoftJson/Pickler.fs#L15
@EirikTsarpalis	https://github.com/eiriktsarpalis
	https://patch-diff.githubusercontent.com/jet/FsCodec#newtonsoftjson-specific-low-level-converters
OptionConverter	https://github.com/jet/FsCodec/blob/master/src/FsCodec.NewtonsoftJson/OptionConverter.fs#L7
VerbatimUtf8JsonConverter	https://github.com/jet/FsCodec/blob/master/src/FsCodec.NewtonsoftJson/VerbatimUtf8JsonConverter.fs#L7
	https://patch-diff.githubusercontent.com/jet/FsCodec#systemtextjson-specific-low-level-converters
this System.Text.Json issue	https://github.com/dotnet/runtime/issues/55744
	https://patch-diff.githubusercontent.com/jet/FsCodec#fscodecnewtonsoftjsonoptions
FsCodec.NewtonsoftJson.Options	https://github.com/jet/FsCodec/blob/master/src/FsCodec.NewtonsoftJson/Options.fs#L8
	https://patch-diff.githubusercontent.com/jet/FsCodec#fscodecsystemtextjsonoptions
FsCodec.SystemTextJson.Options	https://github.com/jet/FsCodec/blob/stj/src/FsCodec.SystemTextJson/Options.fs#L8
AutoUnionTests.fs	https://github.com/jet/FsCodec/blob/master/tests/FsCodec.SystemTextJson.Tests/AutoUnionTests.fs
AutoUnionTests.fs	https://github.com/jet/FsCodec/blob/master/tests/FsCodec.SystemTextJson.Tests/AutoUnionTests.fs
RejectNullStringConverter	https://github.com/jet/FsCodec/blob/master/src/FsCodec.SystemTextJson/RejectNullStringConverter.fs
JsonSerializerOptions.Default	https://github.com/dotnet/runtime/pull/61434
	https://patch-diff.githubusercontent.com/jet/FsCodec#serdes
FsCodec.SystemTextJson/NewtonsoftJson.Serdes	https://github.com/jet/FsCodec/blob/master/src/FsCodec.SystemTextJson/Serdes.fs#L7
	https://patch-diff.githubusercontent.com/jet/FsCodec#usage-of-converters-with-aspnet-core
	https://patch-diff.githubusercontent.com/jet/FsCodec#aspnet-core-with-newtonsoftjson
	https://patch-diff.githubusercontent.com/jet/FsCodec#aspnet-core-with-systemtextjson
to the great work of the .NET team	https://github.com/dotnet/runtime/pull/55108
autoTypeSafeEnumToJsonString and/or autoUnionToJsonObject modes	https://github.com/jet/FsCodec/blob/master/tests/FsCodec.SystemTextJson.Tests/AutoUnionTests.fs
	https://patch-diff.githubusercontent.com/jet/FsCodec#examples-fscodecnewtonsoftsystemtextjson
tests/FsCodec.NewtonsoftJson.Tests/Examples.fsx	https://patch-diff.githubusercontent.com/jet/FsCodec/blob/master/tests/FsCodec.NewtonsoftJson.Tests/Examples.fsx
tests/FsCodec.SystemTextJson.Tests/Examples.fsx	https://patch-diff.githubusercontent.com/jet/FsCodec/blob/master/tests/FsCodec.SystemTextJson.Tests/Examples.fsx
	https://patch-diff.githubusercontent.com/jet/FsCodec#examples-of-using-serdes-to-define-a-contract
	https://patch-diff.githubusercontent.com/jet/FsCodec#simple-contracts-that-tag-all-types-or-fields-necessitating-converters-directly-and-only-records-and-options
	https://patch-diff.githubusercontent.com/jet/FsCodec#more-advanced-case-necessitating-a-custom-converter
	https://patch-diff.githubusercontent.com/jet/FsCodec#encoding-and-conversion-of-f-types
	https://patch-diff.githubusercontent.com/jet/FsCodec#recommended-round-trippable-constructs
FSharp.UMX	https://github.com/fsprojects/FSharp.UMX
FSharp.UMX	https://github.com/fsprojects/FSharp.UMX
	https://patch-diff.githubusercontent.com/jet/FsCodec#unsupported-types-andor-constructs
FSharp.UMX	https://github.com/fsprojects/FSharp.UMX
FSharp.UMX	https://github.com/fsprojects/FSharp.UMX
	https://patch-diff.githubusercontent.com/jet/FsCodec#typesafeenumconverter
	https://patch-diff.githubusercontent.com/jet/FsCodec#out-of-the-box-behavior-newtonsoftjson
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	https://patch-diff.githubusercontent.com/jet/FsCodec#custom-converters-using-jsonisomorphism
JsonIsomorphism	https://github.com/jet/FsCodec/blob/master/src/FsCodec.NewtonsoftJson/Pickler.fs#L49
	https://patch-diff.githubusercontent.com/jet/FsCodec#typesafeenum-fallback-converters-using-jsonisomorphism
	https://patch-diff.githubusercontent.com/jet/FsCodec#features-ieventcodec
tests/FsCodec.SystemTextJson.Tests/Examples.fsx	https://patch-diff.githubusercontent.com/jet/FsCodec/blob/master/tests/FsCodec.SystemTextJson.Tests/Examples.fsx
FsCodec.IEventCodec	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L34
	https://patch-diff.githubusercontent.com/jet/FsCodec#fscodecieventcodec
FsCodec.IEventData	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L4
programming model	https://github.com/jet/equinox/blob/master/DOCUMENTATION.md#programming-model
FsCodec.ITimelineEvent	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L23
summary events	http://verraes.net/2019/05/patterns-for-decoupling-distsys-summary-event/
FsCodec.IEventData	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L4
	https://patch-diff.githubusercontent.com/jet/FsCodec#fscodecieventdata
FsCodec.ITimelineEvent	https://github.com/jet/FsCodec/blob/master/src/FsCodec/FsCodec.fs#L23
	https://patch-diff.githubusercontent.com/jet/FsCodec#fscodecitimelineevent
IEventData	https://patch-diff.githubusercontent.com/jet/FsCodec#IEventData
	https://patch-diff.githubusercontent.com/jet/FsCodec#contracts-for-parsing--routing-event-records
a scheme for the serializing Events modelled as an F# Discriminated Union	https://eiriktsarpalis.wordpress.com/2018/10/30/a-contract-pattern-for-schemaless-datastores/
FSharp.UMX	https://github.com/fsprojects/FSharp.UMX
	https://patch-diff.githubusercontent.com/jet/FsCodec#strongly-typed-stream-ids-using-fsharpumx
	https://patch-diff.githubusercontent.com/jet/FsCodec#stream-naming-conventions
EventStore.org	https://eventstore.org
the code	https://github.com/jet/FsCodec/blob/master/src/FsCodec/StreamName.fs
$by_category	https://developers.eventstore.com/server/5.0.8/server/projections/system-projections.html#by-category
FsCodec.StreamName	https://github.com/jet/FsCodec/blob/master/src/FsCodec/StreamName.fs
	https://patch-diff.githubusercontent.com/jet/FsCodec#module-stream--module-reactions-contracts-for-parsing--routing-event-records
StreamName/StreamId section above	https://patch-diff.githubusercontent.com/jet/FsCodec#streamname
	https://patch-diff.githubusercontent.com/jet/FsCodec#decoding-events
the ClientId type	https://patch-diff.githubusercontent.com/jet/FsCodec#umx
stream name	https://patch-diff.githubusercontent.com/jet/FsCodec#streamname
Logging unmatched events	https://patch-diff.githubusercontent.com/jet/FsCodec#logging-unmatched-events
	https://patch-diff.githubusercontent.com/jet/FsCodec#adding-matchers-to-the-event-contract
	https://patch-diff.githubusercontent.com/jet/FsCodec#processing-reactions-logging-unmatched-events
Serilog	https://github.com/serilog/serilog
	https://patch-diff.githubusercontent.com/jet/FsCodec#handling-versioning-of-events-in-f-with-fscodec
Versioning in an Event Sourced System by Greg Young	https://leanpub.com/esversioning
JsonIsomorphism	https://patch-diff.githubusercontent.com/jet/FsCodec#jsonisimorphism
See example in Propulsion	https://github.com/jet/propulsion/blob/master/src/Propulsion.DynamoStore/AppendsIndex.fs#L17
	https://patch-diff.githubusercontent.com/jet/FsCodec#avoiding-versioning-by-optional-or-nullable-fields
Adding Fields Example	https://github.com/jet/FsCodec/blob/master/tests/FsCodec.NewtonsoftJson.Tests/PicklerTests.fs#L45
	https://patch-diff.githubusercontent.com/jet/FsCodec#upconversion-by-mapping-event-types
Null object pattern	https://en.wikipedia.org/wiki/Null_object_pattern
Upconversion example	https://github.com/jet/FsCodec/blob/master/tests/FsCodec.NewtonsoftJson.Tests/PicklerTests.fs#75
	https://patch-diff.githubusercontent.com/jet/FsCodec#upconversion-via-active-patterns
Upconversion active patterns	https://github.com/jet/FsCodec/blob/master/tests/FsCodec.NewtonsoftJson.Tests/PicklerTests.fs#L114
	https://patch-diff.githubusercontent.com/jet/FsCodec#adding-metadata-to-events-based-on-domain-intrinsic-information
	https://patch-diff.githubusercontent.com/jet/FsCodec#adding-metadata-to-events-based-on-extrinsic-context
generating Metadata based on domain information	https://patch-diff.githubusercontent.com/jet/FsCodec#metadata
IEventCodec	https://patch-diff.githubusercontent.com/jet/FsCodec#IEventCodec
IEventData	https://patch-diff.githubusercontent.com/jet/FsCodec#IEventData
Equinox's	https://github.com/jet/equinox
	https://patch-diff.githubusercontent.com/jet/FsCodec#parsing-metadata-from-events-arriving-via-streams
domain-level Metadata	https://patch-diff.githubusercontent.com/jet/FsCodec#metadata
extrinsic contextual Metadata	https://patch-diff.githubusercontent.com/jet/FsCodec#context
	https://patch-diff.githubusercontent.com/jet/FsCodec#features-fscodecboxcodec
Test Pyramid principles	https://martinfowler.com/articles/practical-test-pyramid.html
	https://patch-diff.githubusercontent.com/jet/FsCodec#related-articles--blog-posts-etc
Contracts for Event Sourced Systems with FsCodec	https://asti.dev/post/fscodec/
@deviousasti	https://github.com/deviousasti
A Contract Pattern for Schemaless DataStores	https://eiriktsarpalis.wordpress.com/2018/10/30/a-contract-pattern-for-schemaless-datastores/
Eirik Tsarpalis	https://github.com/eiriktsarpalis
	https://patch-diff.githubusercontent.com/jet/FsCodec#contributing
has a converter really proved itself broadly applicable	https://en.wikipedia.org/wiki/Rule_of_three_(computer_programming)
FSharp.SystemTextJson	https://github.com/Tarmil/FSharp.SystemTextJson
	https://patch-diff.githubusercontent.com/jet/FsCodec#building
github.com/jet/dotnet-templates	https://github.com/jet/dotnet-templates
json	https://patch-diff.githubusercontent.com/topics/json
fsharp	https://patch-diff.githubusercontent.com/topics/fsharp
converters	https://patch-diff.githubusercontent.com/topics/converters
codec	https://patch-diff.githubusercontent.com/topics/codec
discriminated-unions	https://patch-diff.githubusercontent.com/topics/discriminated-unions
json-net	https://patch-diff.githubusercontent.com/topics/json-net
typeshape	https://patch-diff.githubusercontent.com/topics/typeshape
system-text-json	https://patch-diff.githubusercontent.com/topics/system-text-json
union-encoder	https://patch-diff.githubusercontent.com/topics/union-encoder
unionconverter	https://patch-diff.githubusercontent.com/topics/unionconverter
Readme	https://patch-diff.githubusercontent.com/jet/FsCodec#readme-ov-file
Apache-2.0 license	https://patch-diff.githubusercontent.com/jet/FsCodec#Apache-2.0-1-ov-file
Security policy	https://patch-diff.githubusercontent.com/jet/FsCodec#security-ov-file
Please reload this page	https://patch-diff.githubusercontent.com/jet/FsCodec
Activity	https://patch-diff.githubusercontent.com/jet/FsCodec/activity
Custom properties	https://patch-diff.githubusercontent.com/jet/FsCodec/custom-properties
82 stars	https://patch-diff.githubusercontent.com/jet/FsCodec/stargazers
10 watching	https://patch-diff.githubusercontent.com/jet/FsCodec/watchers
18 forks	https://patch-diff.githubusercontent.com/jet/FsCodec/forks
Report repository	https://patch-diff.githubusercontent.com/contact/report-content?content_url=https%3A%2F%2Fgithub.com%2Fjet%2FFsCodec&report=jet+%28user%29
Releases 24	https://patch-diff.githubusercontent.com/jet/FsCodec/releases
Add FsCodec.Encoding (generalized from FsCodec.Compression) Latest Jun 12, 2025	https://patch-diff.githubusercontent.com/jet/FsCodec/releases/tag/3.1.0
+ 23 releases	https://patch-diff.githubusercontent.com/jet/FsCodec/releases
Packages 0	https://patch-diff.githubusercontent.com/orgs/jet/packages?repo_name=FsCodec
Please reload this page	https://patch-diff.githubusercontent.com/jet/FsCodec
Contributors 19	https://patch-diff.githubusercontent.com/jet/FsCodec/graphs/contributors
Please reload this page	https://patch-diff.githubusercontent.com/jet/FsCodec
+ 5 contributors	https://patch-diff.githubusercontent.com/jet/FsCodec/graphs/contributors
F# 100.0%	https://patch-diff.githubusercontent.com/jet/FsCodec/search?l=f%23
	https://github.com
Terms	https://docs.github.com/site-policy/github-terms/github-terms-of-service
Privacy	https://docs.github.com/site-policy/privacy-policies/github-privacy-statement
Security	https://github.com/security
Status	https://www.githubstatus.com/
Community	https://github.community/
Docs	https://docs.github.com/
Contact	https://support.github.com?tags=dotcom-footer

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