# JSLint

> **TL;DR**
> Required plugin:
>
>
>
> `JavaScript and TypeScript` -    the plugin is bundled with IntelliJ IDEA and enabled by default.
>
>
>
> `JSLint`:   install the plugin on the Settings | Plugins page, tab Marketplace.

> **Warning:**
> Since IntelliJ IDEA 2020.2, [JSLint](https://www.jslint.com) support in the IDE has been deprecated.
>
>
>
> However, JSLint support is still available through the JSLint plugin, which can be installed on the Settings | Plugins page as described in [Installing plugins from JetBrains Marketplace](managing-plugins.html#install_plugin_from_repo).
>
>
>
> Note that JSLint does not fully support some latest ECMAScript features. For more information, refer to [JSLint official website](https://jslint.com/help.html#es6).

When [JSLint support is enabled](#ws_js_linters_jslint_enable_and_configure), IntelliJ IDEA highlights errors that JSLint detects, provides descriptions for them, and suggests quick-fixes where possible.

Descriptions of the errors detected in the current file and quick-fixes for them are available from the editor and from the File tab of the [Problems](linters.html#ws_js_linters_general_problems_tool_window) tool window.

Errors in all previously opened files and quick-fixes for them are shown in the Project Errors tab of the Problems tool window. To open the tool window, click the Inspection widget in the upper-right corner of the editor:

![Inspection widget](https://resources.jetbrains.com.cn/help/img/idea/2026.2/inspection-widget.png)

For more information, refer to [View problems and
apply quick-fixes in the editor](linters.html#ws_js_linters_editor) and [Problems tool window](linters.html#ws_js_linters_general_problems_tool_window).

Procedure: Before you start

* Install and enable the JSLint plugin on the Settings | Plugins page, tab Marketplace, as described in [Installing plugins from
JetBrains Marketplace](managing-plugins.html#install_plugin_from_repo).

Procedure: Enable JSLint and configure its behavior in IntelliJ IDEA

1. In the Settings dialog (`Ctrl+Alt+S` (Windows), `⌘ Comma` (macOS), `⌘ Comma` (IntelliJ IDEA Classic (macOS)), `⌘ Comma` (macOS System Shortcuts), `Ctrl+Alt+S` (XWin), `Ctrl+Alt+S` (GNOME), `Ctrl+Alt+S` (KDE), `Ctrl+Alt+S` (Emacs), `Ctrl+Alt+S` (Sublime Text), `⌘ Comma` (Sublime Text (macOS)), `Ctrl+Alt+S` (NetBeans), `Ctrl+Alt+S` (Visual Studio), `⌘ Comma` (Visual Studio (macOS)), `Ctrl+Alt+S` (Eclipse), `⌘ Comma` (Eclipse (macOS))), go to `Languages & Frameworks | JavaScript | Code Quality Tools | JSLint`, and select the Enable checkbox. After that the other controls on the page become available.

2. By default, the tool reports detected problems of all types. To skip problems of a certain type, select the checkbox next to this type in the Tolerate area.

Learn more about JSLint options from the [JSLint official website](https://www.jslint.com/help.html#browser).

3. In the Assume area, specify the targeted environment to check the code against.

4. In the Globals field, specify the predefined [global variables](https://jslint.com/help.html#global). Type their names or use `predef` object  keys.

5. To verify `.json` files as well, select the JSON checkbox In the Validate also area.

## See also

### Language and Framework-Specific Guidelines

[JavaScript](javascript-specific-guidelines.html)  [JavaScript linters](linters.html)