whatisgithub

What is xo?

rmariuzzo/xo — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2017-07-21

JavaScriptAudience · developerComplexity · 1/5DormantSetup · easy

In one sentence

A zero-config JavaScript code style checker built on ESLint with sensible defaults already chosen, run one command and get consistent, auto-fixable style enforcement.

Mindmap

mindmap
  root((XO))
    What it does
      Checks code style
      Wraps ESLint
      Auto-fixes issues
    Tech stack
      JavaScript
      ESLint
      Node.js
    Use cases
      Skip config debates
      Enforce team consistency
      Editor integration
    Extras
      AVA plugin
      React plugin
      Import rules
    Audience
      JavaScript teams
      Solo developers

Code map

Detail Auto

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filefunction / class

What do people build with it?

USE CASE 1

Enforce consistent JavaScript code style across a team without debating configuration choices.

USE CASE 2

Auto-fix style issues across a codebase with a single --fix command.

USE CASE 3

Integrate style checks into a test suite so code style is validated on every run.

USE CASE 4

Set up linting for a new JavaScript project in seconds with xo --init.

What is it built with?

JavaScriptESLintNode.js

How does it compare?

rmariuzzo/xo3rd-eden/ircb.ioa15n/a15n
LanguageJavaScriptJavaScriptJavaScript
Last pushed2017-07-212016-11-162019-04-07
MaintenanceDormantDormantDormant
Setup difficultyeasyeasyeasy
Complexity1/52/52/5
Audiencedeveloperdevelopergeneral

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min
Not specified in the explanation.

Copy-paste prompts

Prompt 1
Show me how to install XO and run it on my JavaScript project to check for style issues.
Prompt 2
Help me override XO's default style rules in my package.json to match my team's preferences.
Prompt 3
Walk me through integrating XO into my test suite so linting runs automatically.
Prompt 4
How do I use XO's --fix flag to automatically resolve style problems across my codebase?

Frequently asked questions

What is xo?

A zero-config JavaScript code style checker built on ESLint with sensible defaults already chosen, run one command and get consistent, auto-fixable style enforcement.

What language is xo written in?

Mainly JavaScript. The stack also includes JavaScript, ESLint, Node.js.

Is xo actively maintained?

Dormant — no commits in 2+ years (last push 2017-07-21).

What license does xo use?

Not specified in the explanation.

How hard is xo to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is xo for?

Mainly developer.

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