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string-fromto: Conversions between common string types, as well as Base16/Base32/Base64.

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Have you ever found yourself frustrated that you're spending 15-30% of your time in Haskell converting between string types, remembering which module has the toStrict function, importing Data.Text.Encoding and Data.Text.Lazy.Encoding qualified, spending time thinking about how to do Base64 encoding, etc.? Or tried to use one of the (excellent) typeclass-based string conversion libraries, only to find yourself adding awkward type signatures to avoid type-inferencing ambiguities?

This package exports a collection of functions that follow a simple pattern:

stringTypeAToStringTypeB :: a -> b

This way, if you import Data.String.FromTo unqualified, or as part of your Prelude, all you have to think about is which type you want to convert into which other type.

For convenience, this package also exposes conversions between Base16, Base32, and Base64-encoded strings.

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Versions [RSS] 1.0.0.0
Change log CHANGELOG.md
Dependencies base (>=4.8.2.0 && <5), bytestring (>=0.10.4.0 && <0.13), memory (>=0.8 && <0.19), text (>=0.1 && <2.2) [details]
License BSD-3-Clause
Copyright 2018-2019 Clovyr LLC
Author Patrick Nielsen
Maintainer patrick@clovyr.io
Revised Revision 3 made by patrick at 2025-07-22T22:20:50Z
Category Text, Conversion
Home page https://github.com/clovyr/string-fromto
Bug tracker https://github.com/clovyr/string-fromto/issues
Source repo head: git clone https://github.com/clovyr/string-fromto
Uploaded by patrick at 2019-09-30T17:29:07Z
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Downloads 663 total (4 in the last 30 days)
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Readme for string-fromto-1.0.0.0

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string-fromto

A collection of predictably-named functions (e.g. byteStringToString) that convert between the common string types, as well as to and from Base16, Base32, and Base64.

Usage

import Data.String.FromTo -- or imported as part of your Prelude str :: String str = "Hi, I'm a string" text :: Text text = stringToText str encoded :: ByteString encoded = textToBase64ByteString text decoded :: Either String Text decoded = base64ByteStringToText encoded

Documentation

Hackage

License

BSD3

Motivation

Have you ever found yourself frustrated that you're spending 15-30% of your time in Haskell converting between string types, remembering which module has the toStrict function, importing Data.Text.Encoding and Data.Text.Lazy.Encoding qualified, spending time thinking about how to do Base64 encoding, etc.? Or tried to use one of the (excellent) typeclass-based string conversion libraries, only to find yourself adding awkward type signatures to avoid type-inferencing ambiguities?

This library exports a collection of functions that follow a simple pattern:

stringTypeAToStringTypeB :: a -> b

For example:

 stringToByteString :: String -> ByteString stringToLazyByteString :: String -> Lazy.ByteString base64ByteStringToText :: ByteString -> Either String Text

This way, if you import this module unqualified, or as part of your Prelude, all you have to think about is which type you want to convert into which other type.

(Note that not every possible permutation has a function, just each one we've ever needed. If you need one that's not included, please submit a pull request to add it.)