> For AI agents: the complete documentation index is available at https://rslint.rs/llms.txt, the full documentation bundle is available at https://rslint.rs/llms-full.txt.

# no-dupe-keys

[Added in v0.2.2](https://github.com/web-infra-dev/rslint/releases/tag/v0.2.2)
## Configuration

| Preset                   | Configured Value |
| ------------------------ | ---------------- |
| ✅ js.configs.recommended | `"error"`        |


```ts title=rslint.config.ts
import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-dupe-keys': 'error',
    },
  },
]);
```

## Rule Details

Disallow duplicate keys in object literals. Multiple properties with the same key in object literals can cause unexpected behavior.

Examples of **incorrect** code for this rule:

```javascript
var foo = {
  bar: 'baz',
  bar: 'qux',
};

var foo = {
  bar: 'baz',
  bar: 'qux',
};
```

Examples of **correct** code for this rule:

```javascript
var foo = {
  bar: 'baz',
  qux: 'quux',
};

// getter and setter with same name is valid
var foo = {
  get bar() {},
  set bar(v) {},
};
```

## Original Documentation

- [ESLint: no-dupe-keys](https://eslint.org/docs/latest/rules/no-dupe-keys)
- [Source code](https://github.com/eslint/eslint/blob/v10.8.1/lib/rules/no-dupe-keys.js)