---
description: Next.js uses ESLint to find and resolve issues affecting the user or developer experience.
---

# ESLint

Next.js uses [ESLint](https://eslint.org/) to find and resolve issues affecting the user or
developer experience. A minimal set of Next.js rules are provided by default, but can be extended by
adding an `.eslintrc` file to your project.

## Default configuration

By default, Next.js provides a set of [recommended ESLint
rules](https://github.com/vercel/next.js/blob/canary/packages/eslint-plugin-next/lib/index.js#L10-L18)
that are automatically linted against as part of `next build`. If you would like to control which
ESLint rules are checked during builds, you will need to add an `.eslintrc` file to the root of your
project.

Here's an example of an `.eslintrc.json` file:

```json
{
  "extends": ["plugin:@next/next/recommended"],
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "requireConfigFile": false,
    "sourceType": "module",
    "babelOptions": {
      "presets": ["next/babel"]
    }
  }
}
```

- Extending the original base of rules (`plugin:@next/next/recommended`) is highly recommended to
  catch and fix significant Next.js issues in your application.
- Including `@babel/eslint-parser` with the `next/babel` preset ensures that all language features
  supported by Next.js will also be supported by ESLint. Although `@babel/eslint-parser` can parse
  TypeScript, consider using
  [`@typescript-eslint/parser`](https://github.com/typescript-eslint/typescript-eslint/tree/master/packages/parser)
  if you have TypeScript enabled in your application to check for type-specific linting rules.

> If you add an `.eslintrc` file to your application and don't include
> `plugin:@next/next/recommended`in the config, its rules will not be checked during development or
> production builds. This is **not recommended**.

If you want to enable ESLint to run during development, or disable it for production builds; refer
to the documentation for [ESLint Warnings and
Errors](/docs/api-reference/next.config.js/eslint-warnings-errors.md).