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-3.0.0.tbz
sha256=99414da7609b92a02474ef4b49ecda15edc8cbba5229341b124e7e4695c39610
sha512=896d0ea829a36ccadba6628800369c1a3ab9e7c64dbda8b76331889c9db481cd64e137f467481ae80a8dd5fca45d748bfa71f58641806cc1bb1a007f8291789f

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.

Added to opam-repository:

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 (2)

  1. ocaml >= "4.08"
  2. 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 >= "3.0.1"
  8. atdgen-runtime >= "2.10.0"
  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. bitcoin >= "3.0"
  21. bitflyer
  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" & < "1.2.0"
  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. gmocoin
  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. 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. jsonkit
  121. jsonrpc >= "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 >= "3.0.0"
  132. kremlin < "transition"
  133. kubecaml
  134. lablgtk3-extras >= "3.0.1"
  135. lambdapi
  136. landmarks-speedscope
  137. learn-ocaml
  138. letsencrypt < "2.0.0"
  139. letters
  140. libsail
  141. lichess_api
  142. linol >= "0.2" & < "0.10"
  143. linol-eio
  144. linol-lwt
  145. lockfree >= "0.3.1"
  146. logs-async-reporter >= "1.3"
  147. lsp < "1.6.0" | >= "1.23.1"
  148. melange-edn >= "0.5.0"
  149. melange-json = "1.2.0"
  150. melange-json-native
  151. merlin != "4.5-411"
  152. metadb
  153. miaou-core
  154. miaou-driver-web
  155. mirage-crypto-ec
  156. mjson
  157. monorobot
  158. mopsa
  159. multicore-bench
  160. mutaml
  161. nats-client
  162. nats-client-async
  163. neo4j_bolt
  164. nloge
  165. noise
  166. nsq
  167. obuilder
  168. ocaml-ai-sdk
  169. ocaml-lsp-server < "1.10.5" | >= "1.18.0" & != "1.21.0-4.14" & != "1.23.0"
  170. ocaml-protoc-plugin >= "6.1.0"
  171. ocaml_db_model
  172. ocaml_pgsql_model
  173. ocamleditor
  174. ocamlgrep-lib
  175. ocf >= "1.0.0"
  176. ochre
  177. ocsigen-start
  178. odoc >= "3.0.0"
  179. odoc-driver
  180. oframl
  181. oidc
  182. ojs-base
  183. ojs_base
  184. ometrics < "0.2.0"
  185. opam-check-npm-deps >= "4.1.0"
  186. openai-gym
  187. openapi
  188. openapi_router
  189. opencage
  190. openstellina
  191. opium >= "0.19.0"
  192. oraft
  193. orun
  194. osh
  195. oui
  196. ozulip
  197. pa_ppx < "0.14" | >= "0.19"
  198. pandoc
  199. pbrt_yojson
  200. pds-reachability >= "0.2.3"
  201. pgn_parser
  202. pgn_to_tex
  203. phylogenetics >= "0.2.0"
  204. piece_rope
  205. pkcs11-driver >= "1.0.0"
  206. playwright
  207. polymarket
  208. ppx_deriving_jsonschema
  209. ppx_deriving_yojson < "3.6.1"
  210. ppx_hegel_test
  211. ppx_protocol_conv_json >= "5.2.1"
  212. ppx_yojson
  213. ppx_yojson_conv_lib
  214. ppxlib-tools >= "0.37.0"
  215. prof_spacetime
  216. pxshot
  217. qdrant
  218. qmp >= "0.19.0"
  219. query-json
  220. quests
  221. r2pipe
  222. radare2
  223. rdf
  224. records >= "1.0.0"
  225. repr-bench
  226. rescriptdep
  227. rfsm >= "2.2"
  228. rocq-devtools
  229. rpclib
  230. rungen
  231. rust-staticlib-gen
  232. SZXX
  233. safemoney
  234. saga
  235. sail < "0.15"
  236. saturn
  237. saturn_lockfree
  238. satyrographos >= "0.0.2.8" & < "0.0.2.13"
  239. savvy
  240. semver2
  241. serde_json
  242. server-reason-react >= "0.4.0"
  243. shakuhachi
  244. sihl < "0.2.0" | >= "0.3.0~rc2"
  245. sihl-core
  246. simple_httpd
  247. slack
  248. slug
  249. smaws-lib
  250. smtml >= "0.7.0"
  251. snf_mcp < "0.2.1"
  252. spectrum_palette_ppx
  253. spotify-web-api
  254. sqlgg >= "20260721"
  255. starred_ml
  256. swagger
  257. talon < "1.0.0~alpha3"
  258. tdigest < "2.1.0"
  259. testcontainers
  260. textmate-language >= "0.3.4"
  261. textrazor >= "0.1.1"
  262. tidy_email_sendgrid
  263. timedesc < "0.8.0"
  264. timedesc-json
  265. timere < "0.4.0"
  266. transom
  267. user-agent-parser
  268. vecosek
  269. vercel
  270. volgo-vcs >= "0.0.22"
  271. vscoq-language-server < "2.3.3"
  272. vsrocq-language-server
  273. wasm_of_ocaml-compiler
  274. wax
  275. wax-lib
  276. webauthn
  277. why3find
  278. xapi-rrd >= "1.9.0"
  279. yojson-five >= "3.0.0"
  280. yosqlite >= "0.2"
  281. yultracer
  282. zanuda
  283. zarr

Conflicts

None