Tool to generate JSON schema from JSON data

Question

We have this json schema draft  I would like to get a sample of my JSON data and generate a skeleton for the JSON schema  that I can rework manually  adding things like description  required  etc  which can not be infered from the specific examples   For example  from my input example json          foo    lorem         bar    ipsum      I would run my json schema generator tool and would get      foo          type     string        required    true       description     unknown          bar          type     string        required    true       description     unknown          This example has been coded manually  so it has maybe errors  Is there any tool out there which could help me with the conversion JSON -  JSON schema

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There s a python tool to generate JSON Schema for a given JSON  https   github com perenecabuto json schema generator

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json-schema-generator is a neat Ruby based JSON schema generator   It supports both draft 3 and 4 of the JSON schema   It can be run as a standalone executable  or it can be embedded inside of a Ruby script     Then you can use json-schema to validate JSON samples against your newly generated schema if you want

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Summarising the other answers  here are the JSON schema generators proposed so far  Online   https   www liquid-technologies com online-json-to-schema-converter  1 input  http   www jsonschema net  1 input  https   easy-json-schema github io  1 input   Python   https   github com gonvaled jskemator  1 input but allows iteration  https   github com perenecabuto json schema generator  1 input  https   github com rnd0101 json schema inferencer  1 input I think  https   pypi python org pypi genson   multiple inputs  https   pypi python org pypi skinfer  multiple inputs   NodeJS   https   github com Nijikokun generate-schema  multiple inputs  pass object array   https   github com easy-json-schema easy-json-schema  1 input  https   github com aspecto-io genson-js  multiple inputs   Ruby   https   github com maxlinc json-schema-generator  1 input

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generate-schema  NPM   Github  takes a JSON Object generates schemas from it  one output is JSON Schema  it s written in Node js and comes with a REPL and ClI tool for piping files into   Full Disclosure  I m the author

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For the offline tools that support multiple inputs  the best I ve seen so far is https   github com wolverdude GenSON   I d like to see a tool that takes filenames on standard input because I have thousands of files   However  I run out of open file descriptors  so make sure the files are closed   I d also like to see JSON Schema generators that handle recursion   I am now working on generating Java classes from JSON objects in hopes of going to JSON Schema from my Java classes   Here is my GenSON script if you are curious or want to identify bugs in it      bin sh ulimit -n 4096 rm x3d json cat  dev null  gt  x3d json find   Downloads www web3d org x3d content examples -name   json  -      print  xargs node goodJSON js   xargs python bin genson py -i 2 -s     x3d json  gt  gt  x3d json split -p      x3d json x3d json python bin genson py -i 2 -s x3d jsonaa -s x3d jsonab  Users johncarlson Downloads www web3d org x3d content examples X3dForWebAuthors Chapter02-GeometryPrimitives Box json  gt  x3dmerge json

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There s a nodejs tool which supports json schema v4 at https   github com krg7880 json-schema-generator  It works either as a command line tool  or as a nodejs library   var jsonSchemaGenerator   require  json-schema-generator        obj     some    object  true          schemaObj   schemaObj   jsonSchemaGenerator json

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After several months  the best answer I have is my simple tool  It is raw but functional   What I want is something similar to this  The JSON data can provide a skeleton for the JSON schema  I have not implemented it yet  but it should be possible to give an existing JSON schema as basis  so that the existing JSON schema plus JSON data can generate an updated JSON schema  If no such schema is given as input  completely default values are taken   This would be very useful in iterative development  the first time the tool is run  the JSON schema is dummy  but it can be refined automatically according to the evolution of the data

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There are a lot of tools mentioned  but one more called JSON Schema inferencer for the record   https   github com rnd0101 json schema inferencer   it s not a library or a product  but a Python script   With the usual Full Disclosure  I am the author

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You might be looking for this   http   www jsonschema net  It is an online tool that can automatically generate JSON schema from JSON string  And you can edit the schema easily

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GenSON  PyPI   Github  is a JSON Schema generator that can generate a single schema from multiple objects  You can also merge schemas with it  It is written in Python and comes with a CLI tool    Full disclosure  I m the author

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For node js   6 0 0 there is also the json-schema-by-example module

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Seeing that this question is getting quite some upvotes  I add new information  I am not sure if this is new  but I couldn t find it at the time    The home of JSON Schema An implementation of JSON Schema validation for Python Related hacker news discussion A json schema generator in python  which is what I was looking for

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