# Functions

<a id="isnumber"></a>

##  isNumber

▸ **isNumber**(value: *`any`*): `boolean`

*Defined in [is/number.ts:19](https://github.com/polkadot-js/common/blob/815fdc7/packages/util/src/is/number.ts#L19)*

*__name__*: isNumber

*__summary__*: Tests for a JavaScript number.

*__description__*: Checks to see if the input value is a valid number.

*__example__*:   

```javascript
import { isNumber } from '@polkadot/util';

console.log('isNumber', isNumber(1234)); // => true
```

**Parameters:**

| Name | Type |
| ------ | ------ |
| value | `any` |

**Returns:** `boolean`

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