---
url: /docs/guide/usage/linter/rules/jsdoc/check-property-names.md
---

### What it does

Ensures that property names in JSDoc are not duplicated on the same block and that nested properties have defined roots.

### Why is this bad?

`@property` tags with the same name can be confusing and may indicate a mistake.

### Examples

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

```javascript
/**
 * @typedef {object} state
 * @property {number} foo
 * @property {string} foo
 */

/**
 * @typedef {object} state
 * @property {number} foo.bar
 */
```

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

```javascript
/**
 * @typedef {object} state
 * @property {number} foo
 */

/**
 * @typedef {object} state
 * @property {object} foo
 * @property {number} foo.bar
 */
```

## How to use

## Version

This rule was added in v0.2.18.

## References