package yojson

  1. Overview
  2. Docs
Yojson is an optimized parsing and printing library for the JSON format

Install 

dune-project
 Dependency

github.com Readme Changelog BSD-3-Clause License Edit opam file Versions (15)

Authors

  1. M
    Martin Jambon

Maintainers

  1. P
    paul-elliot@tarides.com
  2. N
    nathan@tarides.com
  3. M
    marek@tarides.com

Sources

yojson-2.2.2.tbz
sha256=9abfad8c9a79d4723ad2f6448e669c1e68dbfc87cc54a1b7c064b0c90912c595
sha512=ac52eae3ca1d3129a7885ca638e6ae5bcfc387598a82cc30d3e4988fd154f1756719c399f96e950d898c79a6dbd4ccc44b6f468bcafbd620e6945a0415b41e0c

Description

Yojson is an optimized parsing and printing library for the JSON format.

ydump is a pretty-printing command-line program provided with the yojson package.

Published: 29 Jun 2024

README

Yojson: JSON library for OCaml

Build Status

This library parses JSON data into a nested OCaml tree data structure.

Library documentation

Currently at https://ocaml-community.github.io/yojson/

Examples

A simple example on how to parse JSON from a string literal.

let json_string = {|
  {"number" : 42,
   "string" : "yes",
   "list": ["for", "sure", 42]}|}
(* val json_string : string *)

let json = Yojson.Safe.from_string json_string
(* val json : Yojson.Safe.t *)

let () = Format.printf "Parsed to %a" Yojson.Safe.pp json

Yojson is a pretty common choice for parsing JSON in OCaml, as such it is the base for a number of tools and libraries that are built on top of it.

  • ppx_deriving_yojson to automatically generate code that converts between Yojson.Safe.t and custom OCaml types
  • ppx_yojson_conv, an alternative to ppx_deriving_yojson from Jane Street with different design decisions
  • atd, generates mapping code from .atd specification files and can be used in multiple languages
  • jsonm is an alternate JSON parser that parses JSON into a stream of items, so the complete data structure does not have to be in memory.

Help wanted

Yojson is developed and maintained by volunteers — users like you. Various issues are in need of attention. If you'd like to contribute, please leave a comment on the issue you're interested in, or create a new issue. Experienced contributors will guide you as needed.

There are many simple ways of making a positive impact. For example, you can...

  • Use the software in your project.
  • Give a demo to your colleagues.
  • Share the passion on your blog.
  • Tweet about what you're doing with Yojson.
  • Report difficulties by creating new issues. We'll triage them.
  • Ask questions on StackOverflow.
  • Answer questions on StackOverflow.
  • Discuss usage on the OCaml forums.
  • Pick a task that's easy for you.

Check out in particular good first time issues and other issues with which we could use some help.

License

Yojson is licensed under the 3-clause BSD license, see LICENSE.md for details.

Dependencies (3)

  1. seq >= "0.2.2"
  2. ocaml >= "4.02.3"
  3. dune >= "2.7"

Dev Dependencies (2)

  1. odoc with-doc
  2. alcotest with-test & >= "0.8.5"

  1. 0install >= "2.18"
  2. abella >= "2.0.8"
  3. acgtk
  4. anthropic
  5. archetype
  6. atd >= "2.6.0"
  7. atdgen >= "1.13.0" & < "2.8.0" | >= "2.10.0"
  8. atdgen-runtime >= "2.10.0" & < "3.0.1"
  9. atdml
  10. avro-compiler
  11. avro-simple
  12. aws-config
  13. aws-s3 < "4.5.1" | >= "4.8.0"
  14. awsm-codegen
  15. bap-radare2
  16. beluga >= "1.1"
  17. bitcoin >= "3.0"
  18. boulangerie
  19. builder-web >= "0.2.0"
  20. caisar
  21. calculon
  22. camelot >= "1.4.2"
  23. camels
  24. canary
  25. catala = "0.9.0" | >= "1.0.0~beta"
  26. cb-check
  27. cbor >= "0.3"
  28. chess_com_api
  29. colibrics
  30. comby-semantic
  31. commons
  32. containers >= "3.9"
  33. coq-lsp
  34. coq-of-ocaml
  35. coq-serapi < "8.20.0+0.20.0"
  36. crs >= "0.0.20250705"
  37. current_docker
  38. current_examples
  39. current_git
  40. current_github
  41. current_gitlab
  42. current_slack
  43. current_ssh
  44. current_web
  45. dap
  46. daypack-lib
  47. dblp-api
  48. decoders-yojson >= "0.7.0"
  49. devkit
  50. dnsrobot
  51. docker-api >= "0.2.2"
  52. docker_hub
  53. dot-merlin-reader < "4.9"
  54. dream
  55. dream-inertia
  56. dune-cargo-build
  57. dune-release >= "1.4.0"
  58. dune_deps_extra
  59. eio_main >= "0.10"
  60. elasticsearch-cli = "0.5"
  61. elpi >= "3.3.1"
  62. fehu < "1.0.0~alpha3"
  63. fiat-p256
  64. fit >= "1.2.0"
  65. forester >= "3.1.0"
  66. frama-c < "23.0" | >= "27.0~beta"
  67. fred
  68. frenetic
  69. fstar
  70. gapi-ocaml
  71. gdbprofiler
  72. gemini
  73. gendarme-json < "0.4.0"
  74. gendarme-yojson
  75. github != "4.0.0"
  76. github-data
  77. github-unix < "4.5.1"
  78. gitlab
  79. goblint >= "2.0.0"
  80. goblint-cil >= "1.8.0"
  81. gopcaml-mode-merlin < "0.0.6"
  82. gradescope_submit
  83. graphql < "0.9.0" | >= "0.14.0"
  84. graphql-async >= "0.14.0"
  85. graphql-cohttp >= "0.13.0"
  86. graphql-lwt >= "0.14.0"
  87. graphql_ppx
  88. gremlin
  89. guardian
  90. h2
  91. hacl_x25519
  92. handlebars-ml
  93. hilite < "0.3.0"
  94. hl_yaml
  95. hockmd
  96. hpack
  97. hsluv
  98. httph
  99. huml
  100. huml-cli
  101. index-bench
  102. ip2location
  103. ip2locationio
  104. ip2whois
  105. irmin-graphql
  106. irmin-tezos
  107. jasmin
  108. jhupllib
  109. jose
  110. js_of_ocaml-compiler
  111. jsonrpc < "1.6.0" | >= "1.23.1"
  112. jsonschema
  113. jsonschema-core
  114. jsonschema2atd
  115. jupyter
  116. jupyter-kernel
  117. jwto
  118. kappa-library < "4.1.3"
  119. karamel
  120. kaun >= "1.0.0~alpha1" & < "1.0.0~alpha3"
  121. kind2
  122. kremlin < "transition"
  123. kubecaml
  124. lablgtk3-extras >= "3.0.1"
  125. lambdapi
  126. learn-ocaml
  127. letsencrypt < "2.0.0"
  128. letters
  129. libsail
  130. lichess_api
  131. linol >= "0.2"
  132. linol-eio
  133. linol-lwt
  134. lockfree >= "0.3.1"
  135. logs-async-reporter >= "1.3"
  136. lsp
  137. melange-json = "1.2.0"
  138. melange-json-native
  139. merlin != "4.5-411"
  140. metadb
  141. mirage-crypto-ec
  142. mjson
  143. monorobot
  144. mopsa
  145. morbig >= "0.11.0"
  146. multicore-bench
  147. mutaml
  148. nats-client
  149. nats-client-async
  150. neo4j_bolt
  151. nloge
  152. nsq
  153. obuilder
  154. ocaml-ai-sdk
  155. ocaml-lsp-server
  156. ocaml-protoc-plugin >= "6.1.0"
  157. ocaml_db_model
  158. ocaml_pgsql_model
  159. ocamleditor
  160. ocf
  161. ochre
  162. ocsigen-start
  163. odoc >= "3.0.0"
  164. odoc-driver
  165. oframl
  166. oidc
  167. ojs-base
  168. ojs_base
  169. ometrics < "0.2.0"
  170. opam-check-npm-deps >= "4.1.0"
  171. openai-gym
  172. openapi
  173. openapi_router
  174. opencage
  175. openstellina
  176. opium >= "0.19.0"
  177. oraft
  178. orun
  179. osh
  180. oui
  181. ozulip
  182. pa_ppx < "0.19"
  183. pandoc
  184. pbrt_yojson
  185. pds-reachability >= "0.2.3"
  186. pgn_parser
  187. phylogenetics >= "0.2.0"
  188. piece_rope
  189. pkcs11 >= "1.0.0"
  190. pkcs11-driver >= "1.0.0"
  191. polymarket
  192. ppx_deriving_jsonschema
  193. ppx_deriving_yojson
  194. ppx_protocol_conv_json >= "5.2.1"
  195. ppx_yojson
  196. ppx_yojson_conv_lib
  197. ppxlib-tools >= "0.37.0"
  198. prof_spacetime
  199. pxshot
  200. qdrant
  201. qmp >= "0.19.0"
  202. quests
  203. r2pipe
  204. radare2
  205. rdf
  206. records >= "1.0.0"
  207. repr-bench
  208. rescriptdep
  209. rfsm >= "2.2"
  210. rocq-devtools
  211. rpclib
  212. rungen
  213. rust-staticlib-gen
  214. SZXX
  215. safemoney
  216. saga
  217. sail < "0.15"
  218. saturn
  219. saturn_lockfree
  220. satyrographos >= "0.0.2.8"
  221. savvy
  222. semver2
  223. serde_json
  224. server-reason-react >= "0.4.0"
  225. shakuhachi
  226. sihl < "0.2.0" | >= "0.3.0~rc2"
  227. sihl-core
  228. simple_httpd
  229. slack
  230. slug
  231. smaws-lib
  232. smtml >= "0.7.0"
  233. snf_mcp
  234. spectrum_palette_ppx
  235. spotify-web-api
  236. starred_ml
  237. swagger
  238. talon < "1.0.0~alpha3"
  239. tdigest < "2.1.0"
  240. testcontainers
  241. textmate-language >= "0.3.4"
  242. textrazor >= "0.1.1"
  243. tidy_email_sendgrid
  244. timedesc < "0.8.0"
  245. timedesc-json
  246. timere < "0.4.0"
  247. user-agent-parser
  248. vecosek
  249. vercel
  250. volgo-vcs >= "0.0.22"
  251. vscoq-language-server < "2.3.3"
  252. vsrocq-language-server
  253. wasm_of_ocaml-compiler
  254. webauthn
  255. why3find
  256. xapi-rrd >= "1.9.0"
  257. yojson-five = "2.2.2"
  258. yosqlite
  259. yultracer
  260. zanuda
  261. zarr

Conflicts

None