linnet: Lightweight library for building HTTP API

[ library, linnet ] [ Propose Tags ]

Please see the documentation at

[Skip to Readme]
Versions [faq],,,,,,
Dependencies base (>=4.7 && <5), bytestring (>=, bytestring-conversion (>=0.3.1), case-insensitive (>=, either (>=, exceptions (>=0.10.2), http-types (>=0.12.3), mtl (>=2.2.2), text (>=, transformers (>=, uri-encode (>=, wai (>=, warp (>=3.2.28) [details]
License LicenseRef-Apache
Copyright 2019 Sergey Kolbasov
Author Sergey Kolbasov
Category linnet
Home page
Bug tracker
Source repo head: git clone
Uploaded by sergeykolbasov at 2019-09-01T10:02:52Z
Distributions NixOS:
Downloads 2038 total (4 in the last 30 days)
Rating (no votes yet) [estimated by Bayesian average]
Your Rating
  • λ
  • λ
  • λ
Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2019-09-01 [all 1 reports]


[Index] [Quick Jump]


Maintainer's Corner

For package maintainers and hackage trustees

Readme for linnet-

[back to package description]


Linnet [ˈlɪnɪt] is a lightweight Haskell library for building HTTP API on top of WAI. Library design is heavily inspired by Scala Finch.

Check out for documentation.


Travis (.com) branch Gitter Hackage

Hello world

Here is an example of running simple application using Warp server:

{-# LANGUAGE FlexibleInstances      #-}
{-# LANGUAGE MultiParamTypeClasses  #-}
{-# LANGUAGE OverloadedStrings      #-}
{-# LANGUAGE TypeApplications       #-}
{-# LANGUAGE TypeSynonymInstances   #-}

import Control.Exception (SomeException)
import Data.Function ((&))
import Data.Text (Text, append)
import Linnet
import Network.Wai.Handler.Warp (run)

-- It's necessary to define encoding of exceptions for content-type "text/plain". Here it returns no content
instance Encode TextPlain SomeException where
 encode _ = mempty

helloWorld = get(p' "hello" // path @Text) ~>> (\name -> return $ ok ("Hello, " `append` name))

main :: IO ()
main = run 9000 app
       where app = bootstrap @TextPlain helloWorld & compile & toApp id

Now try to call your application with:

curl -v http://localhost:9000/hello/linnet



Licensed under the Apache License, Version 2.0 (the "License"); you may not use this software except in compliance with the License.

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.