Cassava support for the streaming ecosystem

LTS Haskell 14.27:
Stackage Nightly 2019-09-21:
Latest on Hackage:

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MIT licensed by Ivan Lazar Miljenovic

Module documentation for

This version can be pinned in stack with:streaming-cassava-,1739


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cassava support for the streaming ecosystem

This library allows you to easily stream CSV data in and out. You can do so using both “plain” record-based (with optional header support) or name-based (header required to determine ordering) encoding/decoding.

All encoding/decoding options are supported, it’s possible to automatically add on default headers and you can even choose whether to fail on the first parse error or handle errors on a row-by-row basis.

Errors with readFile

A common use-case is to stream CSV-encoded data in from a file. You may be tempted to use readFile from streaming-bytestring to obtain the file contents, but if you do you’re likely to run into exceptions such as hGetBufSome: illegal operation (handle is closed).

The recommended solution is to use the streaming-with package for the IO aspects. You can then write something like:

withBinaryFileContents \"myFile.csv\" $
  . 'decodeByName'


Revision history for streaming-cassava – 2018-01-23

  • Bump dependency on streaming.

  • Document what to do with readFile errors. – 2017-06-30

  • First version.