https://github.com/jordanmartinez/purescript-json-codecs

A unidirectional value-based JSON codec library.
https://github.com/jordanmartinez/purescript-json-codecs

codec decoding encoding json purescript

Last synced: about 1 month ago
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A unidirectional value-based JSON codec library.

• Host: GitHub
• URL: https://github.com/jordanmartinez/purescript-json-codecs
• Owner: JordanMartinez
• License: mit
• Created: 2022-10-21T17:05:30.000Z (almost 2 years ago)
• Default Branch: master
• Last Pushed: 2023-10-09T20:02:43.000Z (12 months ago)
• Last Synced: 2023-10-10T20:12:39.949Z (12 months ago)
• Topics: codec, decoding, encoding, json, purescript
• Language: PureScript
• Homepage:
• Size: 692 KB
• Stars: 15
• Watchers: 3
• Forks: 1
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-purescript - json-codecs - A bidirectional and unidirectional value-based and runtime-configurable typeclass-based JSON codec library. (Json / Http routing)

README

        
# purescript-json-codecs

A unidirectional value-based JSON codec library.

Whether this is more performant than other options is still being clarified. See the [benchmarks](./bench).

## Design

See [DESIGN.md](DESIGN.md) for the reasoning behind this library's design. The rest of this section covers my goals and where I'm at in that process.

Address gripes with other JSON codec libraries:

- [`simple-json`](https://pursuit.purescript.org/packages/purescript-simple-json/):

  - I don't want to have to [fork or copy the repo](https://github.com/justinwoo/purescript-simple-json#how-should-i-actually-use-this-library) to benefit from it / change various type class instances.

  - I don't want to use your information-poor error type, `NonEmptyList ForeignError`

- [`argonaut-codec`](https://pursuit.purescript.org/packages/purescript-argonaut-codecs)/[`codec-argonaut`](https://pursuit.purescript.org/packages/purescript-codec-argonaut):

  - I don't want to use your "does not allow custom error messages" type, `JsonDecodeError`

  - Allow me to specify the order in which to encode something

  - Allow me the ability to rename fields when encoding/decoding

Improve error messages:

- on type mismatch errors, show me what you expected AND got, not just what was expected

- allow me to write custom error messages

Provide record syntax that distinguishes between

  - when decoding

    - optional fields: whether a field is required or optional

    - renaming: decoding a key "foo" but putting it in a record label "bar"

  - when encoding

    - order of fields: the order in which to encode fields

    - renaming: encoding a record label "bar" but encoding it as "foo" in the JSON

  - See [snapshots](./snapshots/Snapshot/)

For an example of decoding text and encoding examples, see [./test/test-output.txt](./test/test-output.txt)

## License

- [`codec`](https://github.com/garyb/purescript-codec) - Copyright (c) 2019 Gary Burgess (MIT)

- [`codec-argonaut`](https://github.com/garyb/purescript-codec-argonaut/) - Copyright (c) 2017 Gary Burgess (MIT)

- [`argonaut-codec`](https://github.com/purescript-contrib/purescript-argonaut-codecs) - Copyright (c) 2020 PureScript Contrib (MIT)