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. gradescope_submit
  91. graphql < "0.9.0" | >= "0.14.0"
  92. graphql-async >= "0.14.0"
  93. graphql-cohttp >= "0.13.0"
  94. graphql-lwt >= "0.14.0"
  95. graphql_ppx
  96. gremlin
  97. guardian
  98. h2
  99. hacl_x25519
  100. handlebars-ml
  101. hegel
  102. hilite < "0.3.0"
  103. hl_yaml
  104. hockmd
  105. hpack
  106. hsluv
  107. httph
  108. huml
  109. huml-cli
  110. index-bench
  111. ip2location
  112. ip2locationio
  113. ip2whois
  114. irmin-graphql
  115. irmin-tezos
  116. jasmin
  117. jhupllib
  118. jose
  119. js_of_ocaml-compiler
  120. jsonrpc < "1.6.0" | >= "1.23.1"
  121. jsonschema
  122. jsonschema-core
  123. jsonschema2atd
  124. jupyter
  125. jupyter-kernel
  126. jwto
  127. kappa-library < "4.1.3"
  128. karamel
  129. kaun >= "1.0.0~alpha1" & < "1.0.0~alpha3"
  130. kind2
  131. kremlin < "transition"
  132. kubecaml
  133. lablgtk3-extras >= "3.0.1"
  134. lambdapi
  135. learn-ocaml
  136. letsencrypt < "2.0.0"
  137. letters
  138. libsail
  139. lichess_api
  140. linol >= "0.2"
  141. linol-eio
  142. linol-lwt
  143. lockfree >= "0.3.1"
  144. logs-async-reporter >= "1.3"
  145. lsp
  146. melange-json = "1.2.0"
  147. melange-json-native
  148. merlin != "4.5-411"
  149. metadb
  150. miaou-core
  151. miaou-driver-web
  152. mirage-crypto-ec
  153. mjson
  154. monorobot
  155. mopsa
  156. morbig >= "0.11.0"
  157. multicore-bench
  158. mutaml
  159. nats-client
  160. nats-client-async
  161. neo4j_bolt
  162. nloge
  163. noise
  164. nsq
  165. obuilder
  166. ocaml-ai-sdk
  167. ocaml-lsp-server
  168. ocaml-protoc-plugin >= "6.1.0"
  169. ocaml_db_model
  170. ocaml_pgsql_model
  171. ocamleditor
  172. ocf
  173. ochre
  174. ocsigen-start
  175. odoc >= "3.0.0"
  176. odoc-driver
  177. oframl
  178. oidc
  179. ojs-base
  180. ojs_base
  181. ometrics < "0.2.0"
  182. opam-check-npm-deps >= "4.1.0"
  183. openai-gym
  184. openapi
  185. openapi_router
  186. opencage
  187. openstellina
  188. opium >= "0.19.0"
  189. oraft
  190. orun
  191. osh
  192. oui
  193. ozulip
  194. pa_ppx < "0.19"
  195. pandoc
  196. pbrt_yojson
  197. pds-reachability >= "0.2.3"
  198. pgn_parser
  199. phylogenetics >= "0.2.0"
  200. piece_rope
  201. pkcs11 >= "1.0.0"
  202. pkcs11-driver >= "1.0.0"
  203. playwright
  204. polymarket
  205. ppx_deriving_jsonschema
  206. ppx_deriving_yojson
  207. ppx_hegel_test
  208. ppx_protocol_conv_json >= "5.2.1"
  209. ppx_yojson
  210. ppx_yojson_conv_lib
  211. ppxlib-tools >= "0.37.0"
  212. prof_spacetime
  213. pxshot
  214. qdrant
  215. qmp >= "0.19.0"
  216. quests
  217. r2pipe
  218. radare2
  219. rdf
  220. records >= "1.0.0"
  221. repr-bench
  222. rescriptdep
  223. rfsm >= "2.2"
  224. rocq-devtools
  225. rpclib
  226. rungen
  227. rust-staticlib-gen
  228. SZXX
  229. safemoney
  230. saga
  231. sail < "0.15"
  232. saturn
  233. saturn_lockfree
  234. satyrographos >= "0.0.2.8"
  235. savvy
  236. semver2
  237. serde_json
  238. server-reason-react >= "0.4.0"
  239. shakuhachi
  240. sihl < "0.2.0" | >= "0.3.0~rc2"
  241. sihl-core
  242. simple_httpd
  243. slack
  244. slug
  245. smaws-lib
  246. smtml >= "0.7.0"
  247. snf_mcp
  248. soteria
  249. spectrum_palette_ppx
  250. spotify-web-api
  251. starred_ml
  252. swagger
  253. talon < "1.0.0~alpha3"
  254. tdigest < "2.1.0"
  255. testcontainers
  256. textmate-language >= "0.3.4"
  257. textrazor >= "0.1.1"
  258. tidy_email_sendgrid
  259. timedesc < "0.8.0"
  260. timedesc-json
  261. timere < "0.4.0"
  262. transom
  263. user-agent-parser
  264. vecosek
  265. vercel
  266. volgo-vcs >= "0.0.22"
  267. vscoq-language-server < "2.3.3"
  268. vsrocq-language-server
  269. wasm_of_ocaml-compiler
  270. wax
  271. wax-lib
  272. webauthn
  273. why3find
  274. xapi-rrd >= "1.9.0"
  275. yojson-five = "2.2.2"
  276. yosqlite
  277. yultracer
  278. zanuda
  279. zarr

Conflicts

None