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Showing content from https://hackage.haskell.org/package/http-api-data-0.2 below:

http-api-data: Converting to/from HTTP API data like URL pieces, headers and query parameters.

This package defines typeclasses used for converting Haskell data types to and from HTTP API data.

Booleans:

>>> toUrlPiece True
"True"
>>> parseUrlPiece "False" :: Either Text Bool
Right False
>>> parseUrlPiece "something else" :: Either Text Bool
Left "could not parse: `something else'"

Numbers:

>>> toUrlPiece 45.2
"45.2"
>>> parseUrlPiece "452" :: Either Text Int
Right 452
>>> parseUrlPiece "256" :: Either Text Int8
Left "out of bounds: `256' (should be between -128 and 127)"

Strings:

>>> toHeader "hello"
"hello"
>>> parseHeader "world" :: Either Text String
Right "world"

Calendar day:

>>> toQueryParam (fromGregorian 2015 10 03)
"2015-10-03"
>>> toGregorian <$> parseQueryParam "2016-12-01"
Right (2016,12,1)

Contributions and bug reports are welcome!

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