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Haskell JSON schema validator and parser generator
branch: master

aeson-schema Build Status Hackage version Hackage dependencies

aeson-schema is an implementation of the JSON Schema specification. It can be used in two ways:

  • To validate JSON value against a schema.
  • To generate a parser for a schema. The generated code includes Haskell data structure definitions and FromJSON instances. This allows you to use the validated data in a type-safe and convenient way.

You can install this library using cabal:

cabal update && cabal install aeson-schema

Running the tests

aeson-schema utilizes the cabal sandbox. To get up and running with the tests you'll need to use these commands:

cd aeson-schema
git submodule init
git submodule update
cabal sandbox init
cabal install
cabal install --enable-tests
cabal test


aeson-schema implements Draft 3 of the spec. It supports all core schema definitions except the following 'format' values:

  • data-time
  • date
  • time
  • utc-millisec
  • color
  • style
  • phone
  • uri
  • email
  • ip-address
  • ipv6
  • host-name

I would be happy to accept pull requests that implement validation of one of these formats, fix bugs or add other features.

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