jshint

What is jshint?

JSHint is a static code analysis tool used in software development for checking if JavaScript source code complies with coding rules. It helps developers identify potential errors and enforce coding standards.

What are jshint's main functionalities?

Basic Linting

This feature allows you to perform basic linting on a piece of JavaScript code. The code sample demonstrates how to use JSHint to check a simple JavaScript snippet for errors.

const jshint = require('jshint').JSHINT;
const code = 'var a = 1;';
const options = { esversion: 6 };
jshint(code, options);
console.log(jshint.errors);

Custom Configuration

JSHint allows you to customize the linting process with various options. This example shows how to enable the 'undef' option to check for the use of undefined variables.

const jshint = require('jshint').JSHINT;
const code = 'var a = 1;';
const options = { esversion: 6, undef: true };
jshint(code, options);
console.log(jshint.errors);

Using JSHint with Configuration File

You can use a configuration file (e.g., .jshintrc) to define your linting rules. This example demonstrates how to read a JavaScript file and a JSHint configuration file, then lint the code using the specified rules.

const fs = require('fs');
const jshint = require('jshint').JSHINT;
const code = fs.readFileSync('path/to/your/file.js', 'utf8');
const config = JSON.parse(fs.readFileSync('.jshintrc', 'utf8'));
jshint(code, config);
console.log(jshint.errors);

Other packages similar to jshint

eslint

ESLint is another popular JavaScript linting tool that is highly configurable and supports custom rules. It provides more flexibility and a larger ecosystem of plugins compared to JSHint.

jscs

JSCS (JavaScript Code Style) is a code style linter for JavaScript. It focuses more on enforcing coding style conventions rather than finding potential errors. It has been merged with ESLint, but older versions are still in use.

tslint

TSLint is a linter for TypeScript, which is a superset of JavaScript. It provides similar functionality to JSHint but is specifically designed for TypeScript code. TSLint is now deprecated in favor of ESLint with TypeScript support.

README

JSHint, A Static Code Analysis Tool for JavaScript

[ Use it online • About • Docs • FAQ • Install • Hack • Blog • Twitter ]

JSHint is a community-driven tool to detect errors and potential problems in JavaScript code. It is very flexible so you can easily adjust it to your particular coding guidelines and the environment you expect your code to execute in.

Reporting a bug

To report a bug simply create a new GitHub Issue and describe your problem or suggestion. We welcome all kinds of feedback regarding JSHint including but not limited to:

• When JSHint doesn't work as expected
• When JSHint complains about valid JavaScript code that works in all browsers
• When you simply want a new option or feature

Before reporting a bug look around to see if there are any open or closed tickets that cover your issue. And remember the wisdom: pull request > bug report > tweet.

Issue Priority

• P1: Something is throwing exceptions; broken JSHint backward compatibility.
• P2: Something is not being parsed correctly.
• P3: Features that the core team will work on once P2s and P1s are done.
• P4: Patches welcome; The request is good, but low priority.

License

JSHint is distributed under the MIT License. One file and one file only (src/stable/jshint.js) is distributed under the slightly modified MIT License.

The JSHint Team

JSHint is maintained by Rick Waldron, Caitlin Potter, Mike Sherov, and Mike Pennisi.

Thank you!

We really appreciate all kinds of feedback and contributions. Thanks for using and supporting JSHint!

Changelog

2.8.0 (2015-05-31)

Bug Fixes

• add the "fetch" global for "browser" environment (b3b41c8), closes #2355
• Allow lexer to communicate completion (a093f78)
• Distinguish between directive and mode (51059bd)
• Don't throw "Duplicate class method" with computed method names (ab12dfb), closes #2350
• Ignore unused arrow-function parameters if unused: vars (2ea9cb0), closes #2345
• Move helper methods to state object (678da76)
• parse const declarations in ForIn/Of loops (2b673d9), closes #2334 #2335
• Parse semicolons in class bodies (58c8e64)
• Prevent regression in enforceall (6afcde4)
• Relax singleGroups restrictions: arrow fns (4a4f522)
• Relax singleGroups restrictions: IIFEs (9f55160)
• Reset generator flag for each method definition (2444a04), closes #2388 #2389

Features

• Implement module option (290280c)
• support destructuring in ForIn/Of loops, lint bad ForIn/Of LHS (c0edd9f), closes #2341

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