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. 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" & < "0.0.20260307"
  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-release >= "1.4.0"
  60. dune_deps_extra
  61. eio_main >= "0.10"
  62. elasticsearch-cli = "0.5"
  63. elpi >= "3.3.1"
  64. fehu < "1.0.0~alpha3"
  65. fiat-p256
  66. fit >= "1.2.0"
  67. forester >= "3.1.0"
  68. frama-c < "23.0" | >= "27.0~beta"
  69. fred
  70. frenetic
  71. fstar
  72. gapi-ocaml
  73. gdbprofiler
  74. gemini
  75. gendarme-json < "0.4.0"
  76. gendarme-yojson
  77. github != "4.0.0"
  78. github-data
  79. github-unix < "4.5.1"
  80. gitlab
  81. goblint >= "2.0.0"
  82. goblint-cil >= "1.8.0"
  83. gopcaml-mode-merlin < "0.0.6"
  84. gradescope_submit
  85. graphql < "0.9.0" | >= "0.14.0"
  86. graphql-async >= "0.14.0"
  87. graphql-cohttp >= "0.13.0"
  88. graphql-lwt >= "0.14.0"
  89. graphql_ppx
  90. gremlin
  91. guardian
  92. h2
  93. hacl_x25519
  94. handlebars-ml
  95. hilite < "0.3.0"
  96. hl_yaml
  97. hockmd
  98. horned_worm
  99. hpack
  100. hsluv
  101. httph
  102. huml
  103. huml-cli
  104. index-bench
  105. ip2location
  106. ip2locationio
  107. irmin-graphql
  108. irmin-tezos
  109. jasmin
  110. jhupllib
  111. jose
  112. js_of_ocaml-compiler
  113. jsonrpc < "1.6.0" | >= "1.23.1"
  114. jsonschema
  115. jsonschema-core
  116. jsonschema2atd
  117. jupyter
  118. jupyter-kernel
  119. jwto
  120. kappa-library
  121. karamel
  122. kaun >= "1.0.0~alpha1" & < "1.0.0~alpha3"
  123. kind2
  124. kremlin < "transition"
  125. kubecaml
  126. lablgtk3-extras >= "3.0.1"
  127. lambdapi
  128. learn-ocaml
  129. letsencrypt < "2.0.0"
  130. letters
  131. libsail
  132. lichess_api
  133. linol >= "0.2"
  134. linol-eio
  135. linol-lwt
  136. lockfree >= "0.3.1"
  137. logs-async-reporter >= "1.3"
  138. lsp
  139. melange-json = "1.2.0"
  140. melange-json-native
  141. merlin != "4.5-411"
  142. metadb
  143. mirage-crypto-ec
  144. mjson
  145. monorobot
  146. mopsa
  147. morbig >= "0.11.0"
  148. multicore-bench
  149. mutaml
  150. neo4j_bolt
  151. nloge
  152. nsq
  153. obuilder
  154. ocaml-lsp-server
  155. ocaml-protoc-plugin >= "6.1.0"
  156. ocaml_db_model
  157. ocaml_pgsql_model
  158. ocamleditor >= "1.15.2-ocaml414"
  159. ocf
  160. ocsigen-start
  161. odoc >= "3.0.0"
  162. odoc-driver
  163. oframl
  164. oidc
  165. ojs-base
  166. ojs_base
  167. ometrics < "0.2.0"
  168. opam-check-npm-deps >= "4.1.0"
  169. openai-gym
  170. openapi
  171. openapi_router
  172. opencage
  173. openstellina
  174. opium >= "0.19.0"
  175. oraft
  176. orun
  177. osh
  178. oui
  179. ozulip
  180. pa_ppx < "0.19"
  181. pandoc
  182. pbrt_yojson
  183. pds-reachability >= "0.2.3"
  184. petr4
  185. pgn_parser
  186. phylogenetics >= "0.2.0"
  187. piece_rope
  188. pkcs11 >= "1.0.0"
  189. pkcs11-driver >= "1.0.0"
  190. polymarket
  191. ppx_deriving_jsonschema
  192. ppx_deriving_yojson
  193. ppx_protocol_conv_json < "5.0.0" | >= "5.2.1"
  194. ppx_yojson
  195. ppx_yojson_conv < "v0.13.0"
  196. ppx_yojson_conv_lib
  197. prof_spacetime
  198. pxshot
  199. qdrant
  200. qmp >= "0.19.0"
  201. quests
  202. r2pipe
  203. radare2
  204. rdf
  205. records = "0.6.0" | >= "1.0.0"
  206. repr-bench
  207. rfsm >= "2.2"
  208. rocq-devtools
  209. rpclib
  210. rungen
  211. SZXX
  212. safemoney
  213. saga
  214. sail < "0.15"
  215. saturn
  216. saturn_lockfree
  217. satyrographos != "0.0.2.7"
  218. savvy
  219. semver2
  220. serde_json
  221. shakuhachi
  222. sihl < "0.2.0" | >= "0.3.0~rc2"
  223. sihl-core
  224. simple_httpd
  225. slack
  226. slug
  227. smaws-lib
  228. smtml >= "0.7.0"
  229. snf_mcp
  230. spectrum_palette_ppx
  231. spotify-web-api
  232. starred_ml
  233. swagger
  234. talon < "1.0.0~alpha3"
  235. tdigest < "2.1.0"
  236. testcontainers
  237. textmate-language >= "0.3.4"
  238. textrazor >= "0.1.1"
  239. tidy_email_sendgrid
  240. timedesc < "0.8.0"
  241. timedesc-json
  242. timere < "0.4.0"
  243. user-agent-parser
  244. vecosek
  245. vercel
  246. vscoq-language-server < "2.3.3"
  247. vsrocq-language-server
  248. wasm_of_ocaml-compiler
  249. webauthn
  250. why3find
  251. xapi-rrd >= "1.9.0"
  252. yosqlite >= "0.2"
  253. yultracer
  254. zanuda
  255. zarr

Conflicts

None