aeson-yaml: Output any Aeson value as YAML (pure Haskell library)

[ bsd3, json, library, text, web, yaml ] [ Propose Tags ]

This library exposes functions for encoding any Aeson value as YAML. There is also support for encoding multiple values into YAML "documents".

This library is pure Haskell, and does not depend on C FFI with libyaml. It is also licensed under the BSD3 license.

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Dependencies aeson (>= && <1.5), aeson-yaml, base (>= && <5), bytestring (>= && <0.11), text (>=0.1 && <1.3), unordered-containers (>= && <0.3), vector (>=0.1 && <0.13) [details]
License BSD-3-Clause
Copyright 2019 Clovyr LLC
Author Patrick Nielsen
Revised Revision 2 made by patrick at Mon Sep 30 04:17:12 UTC 2019
Category Text, Web, JSON, YAML
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Source repo head: git clone
Uploaded by patrick at Mon Sep 30 03:50:30 UTC 2019
Distributions NixOS:
Executables json-to-yaml
Downloads 418 total (176 in the last 30 days)
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2019-09-30 [all 1 reports]


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BSD3-licensed library to encode any Aeson value as YAML, without a dependency on an external YAML library like yaml (libyaml C FFI) or HsYaml (GPL).


import qualified Data.Aeson.Yaml as Aeson.Yaml

Aeson.Yaml.encode :: ToJSON a => a -> LazyByteString

-- To encode multiple values, separated by '---' (YAML documents),
-- use `encodeDocuments`.
Aeson.Yaml.encodeDocuments :: ToJSON a => [a] -> LazyByteString

-- To encode values of different types, use `toJSON` from `Data.Aeson`
-- like so:
encodeDocuments [toJSON x, toJSON y, toJSON z]

See bin/JsonToYaml.hs for a simple command-line application using this library.