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 != "0.5"
  22. calculon-redis-lib
  23. calculon-web = "0.6"
  24. camelot >= "1.3.0"
  25. camels
  26. canary
  27. catala = "0.9.0" | >= "1.0.0~beta"
  28. cb-check
  29. cbor >= "0.3"
  30. cconv-ppx
  31. chess_com_api
  32. colibrics
  33. comby-semantic
  34. commons
  35. containers >= "3.9"
  36. coq-lsp
  37. coq-of-ocaml
  38. coq-serapi >= "8.10.0+0.7.0" & < "8.20.0+0.20.0"
  39. crs >= "0.0.20250705"
  40. current_docker
  41. current_examples
  42. current_git
  43. current_github
  44. current_gitlab
  45. current_slack
  46. current_ssh
  47. current_web
  48. dap
  49. daypack-lib
  50. dblp-api
  51. decoders-yojson >= "0.7.0"
  52. devkit
  53. dnsrobot
  54. docker-api >= "0.2.2"
  55. docker_hub
  56. dot-merlin-reader < "4.9"
  57. dream
  58. dream-inertia
  59. dune-cargo-build
  60. dune-release >= "1.4.0"
  61. dune_deps_extra
  62. eio_main >= "0.10"
  63. elasticsearch-cli = "0.5"
  64. elpi >= "3.3.1"
  65. fehu < "1.0.0~alpha3"
  66. fiat-p256
  67. fit >= "1.2.0"
  68. forester >= "3.1.0"
  69. frama-c < "23.0" | >= "27.0~beta"
  70. fred
  71. frenetic
  72. fstar
  73. gapi-ocaml
  74. gdbprofiler
  75. gemini
  76. gendarme-json < "0.4.0"
  77. gendarme-yojson
  78. github != "4.0.0"
  79. github-data
  80. github-unix < "4.5.1"
  81. gitlab
  82. goblint >= "2.0.0"
  83. goblint-cil >= "1.8.0"
  84. gopcaml-mode-merlin < "0.0.6"
  85. gradescope_submit
  86. graphql < "0.9.0" | >= "0.14.0"
  87. graphql-async >= "0.14.0"
  88. graphql-cohttp >= "0.13.0"
  89. graphql-lwt >= "0.14.0"
  90. graphql_ppx
  91. gremlin
  92. guardian
  93. h2
  94. hacl_x25519
  95. handlebars-ml
  96. hilite < "0.3.0"
  97. hl_yaml
  98. hockmd
  99. horned_worm
  100. hpack
  101. hsluv
  102. httph
  103. huml
  104. huml-cli
  105. index-bench
  106. ip2location
  107. ip2locationio
  108. ip2whois
  109. irmin-graphql
  110. irmin-tezos
  111. jasmin
  112. jhupllib
  113. jose
  114. js_of_ocaml-compiler
  115. jsonrpc < "1.6.0" | >= "1.23.1"
  116. jsonschema
  117. jsonschema-core
  118. jsonschema2atd
  119. jupyter
  120. jupyter-kernel
  121. jwto
  122. kappa-library < "4.1.3"
  123. karamel
  124. kaun >= "1.0.0~alpha1" & < "1.0.0~alpha3"
  125. kind2
  126. kremlin < "transition"
  127. kubecaml
  128. lablgtk3-extras >= "3.0.1"
  129. lambdapi
  130. learn-ocaml
  131. letsencrypt < "2.0.0"
  132. letters
  133. libsail
  134. lichess_api
  135. linol >= "0.2"
  136. linol-eio
  137. linol-lwt
  138. lockfree >= "0.3.1"
  139. logs-async-reporter >= "1.3"
  140. lsp
  141. melange-json = "1.2.0"
  142. melange-json-native
  143. merlin != "4.5-411"
  144. metadb
  145. mirage-crypto-ec
  146. mjson
  147. monorobot
  148. mopsa
  149. morbig >= "0.11.0"
  150. multicore-bench
  151. mutaml
  152. nats-client
  153. nats-client-async
  154. neo4j_bolt
  155. nloge
  156. nsq
  157. obuilder
  158. ocaml-ai-sdk
  159. ocaml-lsp-server
  160. ocaml-protoc-plugin >= "6.1.0"
  161. ocaml_db_model
  162. ocaml_pgsql_model
  163. ocamleditor >= "1.15.2-ocaml414"
  164. ocf
  165. ocsigen-start
  166. odoc >= "3.0.0"
  167. odoc-driver
  168. oframl
  169. oidc
  170. ojs-base
  171. ojs_base
  172. ometrics < "0.2.0"
  173. opam-check-npm-deps >= "4.1.0"
  174. openai-gym
  175. openapi
  176. openapi_router
  177. opencage
  178. openstellina
  179. opium >= "0.19.0"
  180. oraft
  181. orun
  182. osh
  183. oui
  184. ozulip
  185. pa_ppx < "0.19"
  186. pandoc
  187. pbrt_yojson
  188. pds-reachability >= "0.2.3"
  189. petr4
  190. pgn_parser
  191. phylogenetics >= "0.2.0"
  192. piece_rope
  193. pkcs11 >= "1.0.0"
  194. pkcs11-driver >= "1.0.0"
  195. polymarket
  196. ppx_deriving_jsonschema
  197. ppx_deriving_yojson
  198. ppx_protocol_conv_json < "5.0.0" | >= "5.2.1"
  199. ppx_yojson
  200. ppx_yojson_conv < "v0.13.0"
  201. ppx_yojson_conv_lib
  202. ppxlib-tools >= "0.37.0"
  203. prof_spacetime
  204. pxshot
  205. qdrant
  206. qmp >= "0.19.0"
  207. quests
  208. r2pipe
  209. radare2
  210. rdf
  211. records = "0.6.0" | >= "1.0.0"
  212. repr-bench
  213. rfsm >= "2.2"
  214. rocq-devtools
  215. rpclib
  216. rungen
  217. rust-staticlib-gen
  218. SZXX
  219. safemoney
  220. saga
  221. sail < "0.15"
  222. saturn
  223. saturn_lockfree
  224. satyrographos != "0.0.2.7"
  225. savvy
  226. semver2
  227. serde_json
  228. server-reason-react >= "0.4.0"
  229. shakuhachi
  230. sihl < "0.2.0" | >= "0.3.0~rc2"
  231. sihl-core
  232. simple_httpd
  233. slack
  234. slug
  235. smaws-lib
  236. smtml >= "0.7.0"
  237. snf_mcp
  238. spectrum_palette_ppx
  239. spotify-web-api
  240. starred_ml
  241. swagger
  242. talon < "1.0.0~alpha3"
  243. tdigest < "2.1.0"
  244. testcontainers
  245. textmate-language >= "0.3.4"
  246. textrazor >= "0.1.1"
  247. tidy_email_sendgrid
  248. timedesc < "0.8.0"
  249. timedesc-json
  250. timere < "0.4.0"
  251. user-agent-parser
  252. vecosek
  253. vercel
  254. volgo-vcs >= "0.0.22"
  255. vscoq-language-server < "2.3.3"
  256. vsrocq-language-server
  257. wasm_of_ocaml-compiler
  258. webauthn
  259. why3find
  260. xapi-rrd >= "1.9.0"
  261. yojson-five = "2.2.2"
  262. yosqlite
  263. yultracer
  264. zanuda
  265. zarr

Conflicts

None