brok: Finds broken links in text files

[ bsd3, command-line-tools, library, program ] [ Propose Tags ]

Please see the README on GitHub at

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Dependencies ansi-terminal (>=0.8.2 && <0.9), attoparsec (>= && <0.14), base (>=4.7 && <5), brok, classy-prelude (>=1.5.0 && <1.6), directory (>= && <1.4), file-embed (>=0.0.11 && <0.1), http-client (>=0.5.14 && <0.6), http-conduit (>=2.3.5 && <2.4), text (>= && <1.3), time (>= && <1.9) [details]
License BSD-3-Clause
Copyright 2019 Small Hadron Collider
Author Small Hadron Collider
Category Command Line Tools
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Source repo head: git clone
Uploaded by smallhadroncollider at Fri Feb 8 18:16:14 UTC 2019
Distributions NixOS:
Executables brok
Downloads 152 total (152 in the last 30 days)
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2019-02-08 [all 1 reports]


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Maintainer's Corner

For package maintainers and hackage trustees

Readme for brok-

[back to package description]


Find broken links in text documents


Similar idea to awesome_bot, but with different output options.

Currently only supports http:// and https:// prefixed URLs


Binaries for Mac and Linux are available. Add the binary to a directory in your path (such as /usr/local/bin).


If you have cabal installed:

cabal install brok

Make sure you run cabal update if you haven't run it recently.


Requirements: Stack

The following command will build brök and then install it in ~/.local/bin:

stack build && stack install


Basic Usage

Check all links in a single text file:


Or in multiple files:

brok links.tex

If you're using this as part of a test suite, you probably only need the errors:

brok links.tex > /dev/null



By default brök will cache successes for a day in a .brokdb file. It will always recheck errors.

If you want to adjust the cache length, you can enter the number of seconds after which the cache invalidates:

# cache for a week
brok --cache 604800 links.tex

If you want to avoid creating the .brokdb file or ignore the cache entirely you can use the --no-cache option:

# do not cache results
# and don't use previously generated cache
brok --no-cache links.tex

Ignore URLs

You can tell brök to ignore URLs with specified prefixes:

# ignore facebook and amazon URLS
brok --ignore "" "" links.tex


By default brök waits for 100ms between URL checks. You can change the delay:

# wait for 1 second between checks
brok --interval 1000 links.tex

Only Show Failures

If you want to see what's going on, but you're not interested in successes, then you can use the --only-failures option:

# see what's going on, but only show failures
brok --only-failures links.tex

If you're using brök as part of a script then you should redirect stdout.

Git Pre-Commit Hook

If you want to check all the links in your Git repo are valid before being able to commit then add something like the following to .git/hooks/pre-commit.


#! /bin/bash

# cache for 1 week
# use find to check all *.md files
# only show errors (if there are any)
brok --cache 604800 $(find . -type f -name "*.md") > /dev/null


#! /bin/zsh

# cache for 1 week
# using a zsh glob to check all *.md files
# only show errors (if there are any)
brok --cache 604800 */**/*.md > /dev/null