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. awskit-lwt-unix
  15. awskit-s3
  16. awsm-codegen
  17. awso
  18. awso-common
  19. bap-radare2
  20. beluga >= "1.1"
  21. bitcoin >= "3.0"
  22. bizowie-api
  23. boulangerie
  24. builder-web >= "0.2.0"
  25. cabal
  26. caisar
  27. calculon
  28. camelot >= "1.4.2"
  29. camels
  30. canary
  31. catala = "0.9.0" | >= "1.0.0~beta"
  32. cb-check
  33. cbor >= "0.3"
  34. chess_com_api
  35. colibrics
  36. comby-semantic
  37. commons
  38. containers >= "3.9"
  39. contract
  40. coq-lsp
  41. coq-of-ocaml
  42. coq-serapi < "8.20.0+0.20.0"
  43. crs >= "0.0.20250705"
  44. current_docker
  45. current_examples
  46. current_git
  47. current_github
  48. current_gitlab
  49. current_slack
  50. current_ssh
  51. current_web
  52. dap
  53. daypack-lib
  54. dblp-api
  55. decoders-yojson >= "0.7.0"
  56. devkit
  57. dnsrobot
  58. docker-api >= "0.2.2"
  59. docker_hub
  60. dot-merlin-reader < "4.9"
  61. dream
  62. dream-inertia
  63. dune-cargo-build
  64. dune-release >= "1.4.0"
  65. dune_deps_extra
  66. ecma-regex
  67. eio_main >= "0.10"
  68. elasticsearch-cli = "0.5"
  69. elpi >= "3.3.1"
  70. fehu < "1.0.0~alpha3"
  71. fiat-p256
  72. fit >= "1.2.0"
  73. forester >= "3.1.0"
  74. frama-c < "23.0" | >= "27.0~beta"
  75. fred
  76. frenetic
  77. fstar
  78. gapi-ocaml
  79. gdbprofiler
  80. gemini
  81. gendarme-json < "0.4.0"
  82. gendarme-yojson
  83. github != "4.0.0"
  84. github-data
  85. github-unix < "4.5.1"
  86. gitlab
  87. goblint >= "2.0.0"
  88. goblint-cil >= "1.8.0"
  89. gopcaml-mode-merlin < "0.0.6"
  90. grace >= "0.4.0"
  91. gradescope_submit
  92. graphql < "0.9.0" | >= "0.14.0"
  93. graphql-async >= "0.14.0"
  94. graphql-cohttp >= "0.13.0"
  95. graphql-lwt >= "0.14.0"
  96. graphql_ppx
  97. gremlin
  98. guardian
  99. h2
  100. hacl_x25519
  101. handlebars-ml
  102. hegel
  103. hilite < "0.3.0"
  104. hl_yaml
  105. hockmd
  106. hpack
  107. hsluv
  108. httph
  109. huml
  110. huml-cli
  111. index-bench
  112. ip2location
  113. ip2locationio
  114. ip2whois
  115. irmin-graphql
  116. irmin-tezos
  117. jasmin
  118. jhupllib
  119. jose
  120. js_of_ocaml-compiler
  121. jsonrpc < "1.6.0" | >= "1.23.1"
  122. jsonschema
  123. jsonschema-core
  124. jsonschema2atd
  125. jupyter
  126. jupyter-kernel
  127. jwto
  128. kappa-library < "4.1.3"
  129. karamel
  130. kaun >= "1.0.0~alpha1" & < "1.0.0~alpha3"
  131. kind2
  132. kremlin < "transition"
  133. kubecaml
  134. lablgtk3-extras >= "3.0.1"
  135. lambdapi
  136. learn-ocaml
  137. letsencrypt < "2.0.0"
  138. letters
  139. libsail
  140. lichess_api
  141. linol >= "0.2"
  142. linol-eio
  143. linol-lwt
  144. lockfree >= "0.3.1"
  145. logs-async-reporter >= "1.3"
  146. lsp
  147. melange-json = "1.2.0"
  148. melange-json-native
  149. merlin != "4.5-411"
  150. metadb
  151. miaou-core
  152. miaou-driver-web
  153. mirage-crypto-ec
  154. mjson
  155. monorobot
  156. mopsa
  157. morbig >= "0.11.0"
  158. multicore-bench
  159. mutaml
  160. nats-client
  161. nats-client-async
  162. neo4j_bolt
  163. nloge
  164. noise
  165. nsq
  166. obuilder
  167. ocaml-ai-sdk
  168. ocaml-lsp-server
  169. ocaml-protoc-plugin >= "6.1.0"
  170. ocaml_db_model
  171. ocaml_pgsql_model
  172. ocamleditor
  173. ocf
  174. ochre
  175. ocsigen-start
  176. odoc >= "3.0.0"
  177. odoc-driver
  178. oframl
  179. oidc
  180. ojs-base
  181. ojs_base
  182. ometrics < "0.2.0"
  183. opam-check-npm-deps >= "4.1.0"
  184. openai-gym
  185. openapi
  186. openapi_router
  187. opencage
  188. openstellina
  189. opium >= "0.19.0"
  190. oraft
  191. orun
  192. osh
  193. oui
  194. ozulip
  195. pa_ppx < "0.19"
  196. pandoc
  197. pbrt_yojson
  198. pds-reachability >= "0.2.3"
  199. pgn_parser
  200. phylogenetics >= "0.2.0"
  201. piece_rope
  202. pkcs11 >= "1.0.0"
  203. pkcs11-driver >= "1.0.0"
  204. playwright
  205. polymarket
  206. ppx_deriving_jsonschema
  207. ppx_deriving_yojson
  208. ppx_hegel_test
  209. ppx_protocol_conv_json >= "5.2.1"
  210. ppx_yojson
  211. ppx_yojson_conv_lib
  212. ppxlib-tools >= "0.37.0"
  213. prof_spacetime
  214. pxshot
  215. qdrant
  216. qmp >= "0.19.0"
  217. quests
  218. r2pipe
  219. radare2
  220. rdf
  221. records >= "1.0.0"
  222. repr-bench
  223. rescriptdep
  224. rfsm >= "2.2"
  225. rocq-devtools
  226. rpclib
  227. rungen
  228. rust-staticlib-gen
  229. SZXX
  230. safemoney
  231. saga
  232. sail < "0.15"
  233. saturn
  234. saturn_lockfree
  235. satyrographos >= "0.0.2.8"
  236. savvy
  237. semver2
  238. serde_json
  239. server-reason-react >= "0.4.0"
  240. shakuhachi
  241. sihl < "0.2.0" | >= "0.3.0~rc2"
  242. sihl-core
  243. simple_httpd
  244. slack
  245. slug
  246. smaws-lib
  247. smtml >= "0.7.0"
  248. snf_mcp
  249. soteria
  250. spectrum_palette_ppx
  251. spotify-web-api
  252. sqlgg >= "20260721"
  253. starred_ml
  254. swagger
  255. talon < "1.0.0~alpha3"
  256. tdigest < "2.1.0"
  257. testcontainers
  258. textmate-language >= "0.3.4"
  259. textrazor >= "0.1.1"
  260. tidy_email_sendgrid
  261. timedesc < "0.8.0"
  262. timedesc-json
  263. timere < "0.4.0"
  264. transom
  265. user-agent-parser
  266. vecosek
  267. vercel
  268. volgo-vcs >= "0.0.22"
  269. vscoq-language-server < "2.3.3"
  270. vsrocq-language-server
  271. wasm_of_ocaml-compiler
  272. wax
  273. wax-lib
  274. webauthn
  275. why3find
  276. xapi-rrd >= "1.9.0"
  277. yojson-five = "2.2.2"
  278. yosqlite
  279. yultracer
  280. zanuda
  281. zarr

Conflicts

None