---
url: /docs/guide/usage/linter/rules/jest/prefer-to-have-length.md
---

### What it does

In order to have a better failure message, `toHaveLength()` should be used upon
asserting expectations on objects length property.

### Why is this bad?

This rule triggers a warning if `toBe()`, `toEqual()` or `toStrictEqual()` is
used to assert objects length property.

### Examples

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

```javascript
expect(files["length"]).toBe(1);
expect(files["length"]).toBe(1);
expect(files["length"])["not"].toBe(1);
```

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

```javascript
expect(files).toHaveLength(1);
```

## How to use

## Version

This rule was added in v0.2.13.

## References