---
title: setPrivateKey
---
# setPrivateKey <TitleWithCodeLink2 link="setPrivateKey" />

Set a private key used with the TronWeb instance, used for obtaining the address, signing transactions, and getting balances.

> ❗️WARNING :
>
> Do not use this with any web/user facing TronWeb instances. This will leak the private key.

## Usage

```JavaScript
TronWeb.setPrivateKey(private key);
```

## Parameters

| Parameter   | Description               | Data Type |
| ----------- | ------------------------- | --------- |
| private key | The private key to be set | String    |

## Returns

No return value

## Example

```JavaScript
tronWeb.setPrivateKey('AD71****7509');
tronWeb.defaultPrivateKey
// output-start
'AD71****7509'
// output-end
```