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

Set the API Key parameters of all TronWeb API requests

**Note**:
It needs to be set only when using the Trongrid service. For API Key parameter application and use, please refer to [document](https://developers.tron.network/reference#api-key).

### Usage

```JavaScript
TronWeb.setHeader({"TRON-PRO-API-KEY": 'your api key'});
```

### Parameter

| Parameter | Description         | Data Type |
| --------- | ------------------- | --------- |
| Options   | http request header | Object    |

### Returns

No return value

### Example

```JavaScript
const tronWeb = new TronWeb({fullHost: 'fullHost'});
tronWeb.setHeader({ "TRON-PRO-API-KEY": 'xxx' });
```