psanford / json-error-mode

An Emacs minor mode that provides json syntax error checking

json-error - An Emacs minor mode that provides json syntax error checking

This is an Emacs minor mode that provides syntax error checking and highlighting for json buffers. It implements a json parser in elisp to provide accurate checking.

Currently the parser is only used to check for syntax errors. While it could also be used for normal (font-lock) syntax highlighting and indenting, other javascript major modes handle that fairly well (like js-mode). Since the main feature I wanted was error checking, that was the first thing to be implemented.

To enable js-mode and json-error-mode for .json files add something like this to your config:

(require 'js-mode)
(require 'json-error)

(add-to-list 'auto-mode-alist '(".json$" . js-mode))
;; load json-error-mode when looking at json files
(add-hook 'js-mode-hook
      (lambda ()
        (when (string-match "\\.json$" (buffer-file-name))
          (json-error-mode))))

Internals

The json parser is a port of the go json parser to elisp. The buffer updating and reparsing is mostly borrowed from js2-mode.

Steve Yegge gets a huge shout-out for showing us how awesome really good emacs modes can be. He also gets a small fist-shake for not just implementing this in js2-mode in 2008.

json-error-mode's Issues

json-error-error-face == 💩

Firstly, thank you for your amazing package! It is amazing!

Lastly, if the json-error-error-face inherited from the basic error face instead of choosing its own colors, it would automatically be styled by themes and work better in low color environments.