Flycheck Syntax checking for GNU Emacs

Flycheck is a modern on-the-fly syntax checking extension for GNU Emacs, intended as replacement for the older Flymake extension which is part of GNU Emacs.

It uses various syntax checking and linting tools to automatically check the contents of buffers while you type, and reports warnings and errors directly in the buffer, or in an optional error list:

Annotated screenshot of Flycheck

Out of the box Flycheck supports over 40 different programming languages with more than 80 different syntax checking tools, and comes with a simple interface to define new syntax checkers.

Many 3rd party extensions provide new syntax checkers and other features like alternative error displays or mode line indicators.

Very quick start

Flycheck needs GNU Emacs 24.1 or newer, and works best on Unix systems. Windows users, please be aware that Flycheck does not support Windows officially, although it should mostly work fine on Windows. See Windows support and watch out for known Windows issues!

Install some syntax checker tools and type the following in your *scratch* buffer and run M-x eval-buffer:

(require 'package)
(add-to-list 'package-archives
             '("melpa" . "") t)

(package-install 'flycheck)


For a more gentle introduction read the Installation instructions and go through Quickstart guide.

Latest news

These are the latest news about Flycheck and it’s community:

02 Jan 2016
New Code of Conduct and Gitter chat
14 Nov 2015
Flycheck 0.25
27 Oct 2015
Standard input for syntax checkers
15 Aug 2015
Flycheck 0.24
06 Apr 2015
Flycheck 0.23