Code Quality Rank: L1
Programming language: JavaScript
License: The Unlicense
Tags: QA Tools    
Latest version: v2022.3.30

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JSLint, The JavaScript Code Quality and Coverage Tool

Douglas Crockford [email protected]


Branch master(v2022.3.30) beta(Web Demo) alpha(Development)
CI ci ci ci
Coverage coverage coverage coverage

Table of Contents

  1. Web Demo

  2. Web Demo Archived

  3. API Doc

  4. Quickstart Install

  5. Quickstart JSLint Report

  6. Quickstart V8 Coverage Report

  7. Quickstart JSLint in Vim

  8. Description

  9. Package Listing

  10. Changelog

  11. License

Web Demo


Web Demo Archived



Quickstart Install

To install, just download https://www.jslint.com/jslint.mjs and save to file:

```shell <!-- shRunWithScreenshotTxt .artifact/screenshot_sh_install_download.svg -->


curl -L https://www.jslint.com/jslint.mjs > jslint.mjs

- shell output


### To run `jslint.mjs` in shell:
```shell <!-- shRunWithScreenshotTxt .artifact/screenshot_sh_jslint_file.svg -->

printf "console.log('hello world');\n" > hello.js

node jslint.mjs hello.js
  • shell output


To import jslint.mjs in ES Module environment:

```shell <!-- shRunWithScreenshotTxt .artifact/screenshot_js_import_esm.svg -->


node --input-type=module --eval '

/jslint devel/

// Import JSLint in ES Module environment.

import jslint from "./jslint.mjs";

let globals = ["caches", "indexedDb"]; let options = {browser: true}; let result; let source = "console.log(\u0027hello world\u0027);\n";

// JSLint and print .

result = jslint.jslint(source, options, globals); result.warnings.forEach(function ({ formatted_message }) { console.error(formatted_message); });


- shell output


### To import `jslint.mjs` in CommonJS environment:
```shell <!-- shRunWithScreenshotTxt .artifact/screenshot_js_import_cjs.svg -->

node --eval '

/*jslint devel*/
(async function () {
    let globals = ["caches", "indexedDb"];
    let jslint;
    let options = {browser: true};
    let result;
    let source = "console.log(\u0027hello world\u0027);\n";

// Import JSLint in CommonJS environment.

    jslint = await import("./jslint.mjs");
    jslint = jslint.default;

// JSLint <source> and print <formatted_message>.

    result = jslint.jslint(source, options, globals);
    result.warnings.forEach(function ({
    }) {

  • shell output


To JSLint entire directory in shell:

```shell <!-- shRunWithScreenshotTxt .artifact/screenshot_sh_jslint_dir.svg -->


JSLint directory '.'

node jslint.mjs .

- shell output


# Quickstart JSLint Report

### To create a JSLint report in shell:
```shell <!-- shRunWithScreenshotTxt .artifact/screenshot_sh_jslint_report_file.svg -->

printf "function foo() {console.log('hello world');}\n" > hello.js

# Create JSLint report from file 'hello.js' in shell.

node jslint.mjs \
    jslint_report=.artifact/jslint_report_hello.html \
  • shell output



To create a JSLint report in javascript:

```shell <!-- shRunWithScreenshotTxt .artifact/screenshot_js_jslint_report_file.svg -->


node --input-type=module --eval '

/jslint devel/ import jslint from "./jslint.mjs"; import fs from "fs"; (async function () { let report; let result; let source = "function foo() {console.log(\u0027hello world\u0027);}\n";

// Create JSLint report from in javascript.

result = jslint.jslint(source);
report = jslint.jslint_report(result);

await fs.promises.mkdir(".artifact/", {recursive: true});
await fs.promises.writeFile(".artifact/jslint_report_hello.html", report);
console.error("wrote file .artifact/jslint_report_hello.html");



- shell output


- screenshot file [.artifact/jslint_report_hello.html](https://jslint-org.github.io/jslint/branch-beta/.artifact/jslint_report_hello.html)


# Quickstart V8 Coverage Report

### To create V8 coverage report from Node.js / Npm program in shell:
```shell <!-- shRunWithScreenshotTxt .artifact/screenshot_sh_coverage_report_spawn.svg -->

git clone https://github.com/mapbox/node-sqlite3 node-sqlite3-sh \
    --branch=v5.0.2 \
    --depth=1 \

cd node-sqlite3-sh
npm install

# Create V8 coverage report from program `npm run test` in shell.

node ../jslint.mjs \
    v8_coverage_report=../.artifact/coverage_sqlite3_sh/ \
    --exclude-node-modules=true \
    --exclude=test/foo.js,test/bar.js \
    --exclude=test/baz.js \
    npm run test
  • shell output




To create V8 coverage report from Node.js / Npm program in javascript:

```shell <!-- shRunWithScreenshotTxt .artifact/screenshot_js_coverage_report_spawn.svg -->


git clone https://github.com/mapbox/node-sqlite3 node-sqlite3-js \ --branch=v5.0.2 \ --depth=1 \ --single-branch

cd node-sqlite3-js npm install

node --input-type=module --eval '

/jslint node/ import jslint from "../jslint.mjs"; (async function () {

// Create V8 coverage report from program npm run test in javascript.

await jslint.v8CoverageReportCreate({
    coverageDir: "../.artifact/coverage_sqlite3_js/",
    processArgv: [
        "npm", "run", "test"



- shell output


- screenshot file [.artifact/coverage_sqlite3_js/index.html](https://jslint-org.github.io/jslint/branch-beta/.artifact/coverage_sqlite3_js/index.html)


- screenshot file [.artifact/coverage_sqlite3_js/lib/sqlite3.js.html](https://jslint-org.github.io/jslint/branch-beta/.artifact/coverage_sqlite3_js/lib/sqlite3.js.html)


# Quickstart JSLint in Vim

### To run JSLint in Vim:
1. Download and save [`jslint.mjs`](https://www.jslint.com/jslint.mjs), [`jslint_wrapper_vim.vim`](https://www.jslint.com/jslint_wrapper_vim.vim) to directory `~/.vim/`
2. Add vim-command `:source ~/.vim/jslint_wrapper_vim.vim` to file `~/.vimrc`
3. Vim can now jslint files (via nodejs):
    - with vim-command `:SaveAndJslint`
    - with vim-key-combo `<Ctrl-S> <Ctrl-J>`
- screenshot


# Description
- [jslint.mjs](jslint.mjs) contains the jslint function. It parses and analyzes a source file, returning an object with information about the file. It can also take an object that sets options.

- [index.html](index.html) runs the jslint.mjs function in a web page.

- [help.html](help.html) describes JSLint's usage. Please [read it](https://jslint-org.github.io/jslint/help.html).

JSLint can be run anywhere that JavaScript (or Java) can run.

The place to express yourself in programming is in the quality of your ideas and
the efficiency of their execution. The role of style in programming is the same
as in literature: It makes for better reading. A great writer doesn't express
herself by putting the spaces before her commas instead of after, or by putting
extra spaces inside her parentheses. A great writer will slavishly conform to
some rules of style, and that in no way constrains her power to express herself
creatively. See for example William Strunk's The Elements of Style

This applies to programming as well. Conforming to a consistent style improves
readability, and frees you to express yourself in ways that matter. JSLint here
plays the part of a stern but benevolent editor, helping you to get the style
right so that you can focus your creative energy where it is most needed.

# Package Listing

# Changelog


# License
- JSLint is under [Unlicense License](LICENSE).
- CodeMirror editor is under [MIT License](https://github.com/codemirror/CodeMirror/blob/master/LICENSE).
- Function `v8CoverageListMerge` is derived from [MIT Licensed v8-coverage](https://github.com/demurgos/v8-coverage/blob/73446087dc38f61b09832c9867122a23f8577099/ts/LICENSE.md).

node --eval '

*Note that all licence references and agreements mentioned in the JSLint README section above are relevant to that project's source code only.