No decisions to make. No .jshintrc, .jscsrc, or .eslintrc files to manage. It just works.

This module saves you time in two ways:

• No configuration. Just drop it in. The easiest way to enforce consistent style in your module/project.
• Catch style errors before they're submitted in PRs. Saves precious code review time by eliminating back-and-forth between maintainer and contributor.

npm install standard

• 2 spaces for indentation
• Single quotes for strings
  • Except to avoid escaping like "in this lil' string"
• Unix line breaks (LF)
• No unused variables (this one catches so many bugs and typos!)
• No semicolons
  • It's totally fine. Really!
• Never start a line with ( or [
  • This is the only gotcha with omitting semicolons – automatically checked for you!
  • Always prefix with ; like this ;[1, 2, 3].join(' ')
• Spaces after keywords
  • if (condition) { ... }
• Spaces before/after function definitions
  • function name (arg1, arg2) { ... }
• Always name the context variable self
  • var self = this
  • Checks for accidental use of window.self when var self = this is omitted
• Always use === instead of ==
  • obj == null is allowed for succinctness (obj === null || obj === undefined)
• Always handle the node.js err function parameter

To get a better idea, take a look at a sample file written in JavaScript Standard Style.

Use this in one of your projects? Include one of these badges in your readme to let people know that your code is using the standard style.

[![js-standard-style](https://raw.githubusercontent.com/feross/standard/master/badge.png)](https://github.com/feross/standard)

[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/feross/standard)

The easiest way to use JavaScript Standard Style to check your code is to install it globally as a Node command line program. To do so, simply run the following command in your terminal (flag -g installs standard globally on your system, omit it if you want to install in the current working directory):

npm install standard -g

After you've done that you should be able to use the standard program. The simplest use case would be checking the style of all JavaScript files in the current working directory:

$ standard
Error: Code style check failed:
  lib/torrent.js:950:11: Expected '===' and instead saw '=='.

First, install standard. Then, install the appropriate plugin for your editor:

• Vim - Just install Syntastic.
• Sublime Text - Install (1) Package Control, (2) SublimeLinter, and (3) SublimeLinter-contrib-standard.
• Atom - Install (1) Linter and (2) linter-js-standard.

1. Add it to package.json

{
  "name": "my-cool-package",
  "devDependencies": {
    "standard": "*"
  },
  "scripts": {
    "test": "standard && node my-normal-tests.js"
  }
}

2. Check style automatically when you run npm test

$ npm test
Error: Code style check failed:
  lib/torrent.js:950:11: Expected '===' and instead saw '=='.

3. Never give style feedback on a pull request again!

The beauty of JavaScript Standard Style is that it's simple. No one wants to maintain multiple hundred-line .jshintrc and .jscsrc for every module/project they work on. Enough of this madness!

This module saves you time in two ways:

• No configuration. Just drop it in. The easiest way to enforce consistent style in your module/project.
• Catch style errors before they're submitted in PRs. Saves precious code review time by eliminating back-and-forth between maintainer and contributor.

The paths node_modules/, .git/, *.min.js, bundle.js, and coverage/ are automatically excluded when looking for .js files to style check.

Sometimes you need to ignore additional folders or specific minfied files. To do that, add a standard.ignore property to package.json:

"standard": {
  "ignore": [
    "**/out/**",
    "**/lib/select2/**",
    "**/lib/ckeditor/**"
  ]
}

Yes, try using the --format option. This uses Max Ogden's experimental auto formatter standard-format to fix the easier cases.

In rare cases, you'll need to break a rule and hide the warning generated by standard.

JavaScript Standard Style uses eslint and jscs under-the-hood and you can hide their warnings as you normally would if you used each linter directly.

To get verbose output (so you can find the particular rule name to ignore), run:

$ standard --verbose
Error: Code style check failed:
  routes/error.js:20:36: 'file' was used before it was defined. (eslint/no-use-before-define)
  routes/submit.js:85:2: Expected indentation of 2 characters (jscs/validateIndentation)

The first error is from eslint. In this case, the rule name is "no-use-before-define". You can hide it with a /*eslint-disable no-use-before-define */ comment. Re-enable with a /*eslint-enable no-use-before-define */ comment.

Example:

/*eslint-disable no-use-before-define */
// offending code here...
/*eslint-enable no-use-before-define */

The second error is from jscs. In this case, the rule name is "validateIndentation". You can hide it with a // jscs:disable validateIndentation comment. Re-enable with a // jscs:enable validateIndentation comment.

No. Use eslint or jscs directly if you want that.

Pro tip: Just use standard and move on. There are actual real problems that you could spend your time solving :p

standard prints to stderr. This means that tools that read from stdout won't be able to read its output. The solution is to make standard print to stdout instead:

standard 2>&1 | grep variable

MIT. Copyright (c) Feross Aboukhadijeh.