# Functions

<a id="bntohex"></a>

##  bnToHex

▸ **bnToHex**(value?: * `BN` &#124; `number`*, bitLength?: *`number`*): `string`

*Defined in [bn/toHex.ts:28](https://github.com/polkadot-js/common/blob/02d4155/packages/util/src/bn/toHex.ts#L28)*

*__name__*: bnToHex

*__signature__*: bnToHex (value?: BN, bitLength: number = -1): string

*__summary__*: Creates a hex value from a BN.js bignumber object.

*__description__*: `null` inputs returns a `0x` result, BN values return the actual value as a `0x` prefixed hex value. Anything that is not a BN object throws an error. With `bitLength` set, it fixes the number to the specified length.

*__example__*:   

```javascript
import BN from 'bn.js';
import { bnToHex } from '@polkadot/util';

bnToHex(new BN(0x123456)); // => '0x123456'
```

**Parameters:**

| Param | Type | Default value |
| ------ | ------ | ------ |
| `Optional` value |  `BN` &#124; `number`| - |
| `Default value` bitLength | `number` |  -1 |

**Returns:** `string`

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