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-2.1.2.tbz
sha256=59f2f1abbfc8a7ccbdbf608894e5c75e8a76006e34899254446f83e200dfb4f9
sha512=309cba7568dec51de20c7ab8df033258c275b8d58b0a36a66b26e673a3bc050cbd7e39ff8fe4796e89263e125bcc21e04dc36a394f3cc201956887eee1fb281a

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: 27 Nov 2023

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 (4)

  1. seq >= "0.2.2"
  2. cppo build
  3. ocaml >= "4.02.3"
  4. 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" & < "0.0.20260307"
  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-release >= "1.4.0"
  64. dune_deps_extra
  65. ecma-regex
  66. eio_main >= "0.10"
  67. elasticsearch-cli = "0.5"
  68. elpi >= "3.3.1"
  69. fehu < "1.0.0~alpha3"
  70. fiat-p256
  71. fit >= "1.2.0"
  72. forester >= "3.1.0"
  73. frama-c < "23.0" | >= "27.0~beta"
  74. fred
  75. frenetic
  76. fstar
  77. gapi-ocaml
  78. gdbprofiler
  79. gemini
  80. gendarme-json < "0.4.0"
  81. gendarme-yojson
  82. github != "4.0.0"
  83. github-data
  84. github-unix < "4.5.1"
  85. gitlab
  86. goblint >= "2.0.0"
  87. goblint-cil >= "1.8.0"
  88. gopcaml-mode-merlin < "0.0.6"
  89. grace >= "0.4.0"
  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. irmin-graphql
  114. irmin-tezos
  115. jasmin
  116. jhupllib
  117. jose
  118. js_of_ocaml-compiler
  119. jsonkit
  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
  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-lsp-server
  167. ocaml-protoc-plugin >= "6.1.0"
  168. ocaml_db_model
  169. ocaml_pgsql_model
  170. ocamleditor
  171. ocf
  172. ochre
  173. ocsigen-start
  174. odoc >= "3.0.0"
  175. odoc-driver
  176. oframl
  177. oidc
  178. ojs-base
  179. ojs_base
  180. ometrics < "0.2.0"
  181. opam-check-npm-deps >= "4.1.0"
  182. openai-gym
  183. openapi
  184. openapi_router
  185. opencage
  186. openstellina
  187. opium >= "0.19.0"
  188. oraft
  189. orun
  190. osh
  191. oui
  192. ozulip
  193. pa_ppx < "0.19"
  194. pandoc
  195. pbrt_yojson
  196. pds-reachability >= "0.2.3"
  197. pgn_parser
  198. phylogenetics >= "0.2.0"
  199. piece_rope
  200. pkcs11 >= "1.0.0"
  201. pkcs11-driver >= "1.0.0"
  202. playwright
  203. polymarket
  204. ppx_deriving_jsonschema
  205. ppx_deriving_yojson
  206. ppx_hegel_test
  207. ppx_protocol_conv_json >= "5.2.1"
  208. ppx_yojson
  209. ppx_yojson_conv_lib
  210. prof_spacetime
  211. pxshot
  212. qdrant
  213. qmp >= "0.19.0"
  214. quests
  215. r2pipe
  216. radare2
  217. rdf
  218. records >= "1.0.0"
  219. repr-bench
  220. rescriptdep
  221. rfsm >= "2.2"
  222. rocq-devtools
  223. rpclib
  224. rungen
  225. SZXX
  226. safemoney
  227. saga
  228. sail < "0.15"
  229. saturn
  230. saturn_lockfree
  231. satyrographos >= "0.0.2.8"
  232. savvy
  233. semver2
  234. serde_json
  235. shakuhachi
  236. sihl < "0.2.0" | >= "0.3.0~rc2"
  237. sihl-core
  238. simple_httpd
  239. slack
  240. slug
  241. smaws-lib
  242. smtml >= "0.7.0"
  243. snf_mcp
  244. soteria
  245. spectrum_palette_ppx
  246. spotify-web-api
  247. sqlgg >= "20260721"
  248. starred_ml
  249. swagger
  250. talon < "1.0.0~alpha3"
  251. tdigest < "2.1.0"
  252. testcontainers
  253. textmate-language >= "0.3.4"
  254. textrazor >= "0.1.1"
  255. tidy_email_sendgrid
  256. timedesc < "0.8.0"
  257. timedesc-json
  258. timere < "0.4.0"
  259. transom
  260. user-agent-parser
  261. vecosek
  262. vercel
  263. vscoq-language-server < "2.3.3"
  264. vsrocq-language-server
  265. wasm_of_ocaml-compiler
  266. wax
  267. wax-lib
  268. webauthn
  269. why3find
  270. xapi-rrd >= "1.9.0"
  271. yosqlite >= "0.2"
  272. yultracer
  273. zanuda
  274. zarr

Conflicts

None