> ## Documentation Index
> Fetch the complete documentation index at: https://developers.avacloud.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Global Parameters

Certain parameters are configured globally. These parameters may be set on the SDK client instance itself during initialization. When configured as an option during SDK initialization, These global values will be used as defaults on the operations that use them. When such operations are called, there is a place in each to override the global value, if needed.

For example, you can set `chainId` to `43114` at SDK initialization and then you do not have to pass the same value on calls to operations like getBlock. But if you want to do so you may, which will locally override the global setting. See the example code below for a demonstration.

### Available Globals

The following global parameters are available.

| Name      | Type                          | Required | Description                                              |
| :-------- | :---------------------------- | :------- | :------------------------------------------------------- |
| `chainId` | string                        | No       | A supported EVM chain id, chain alias, or blockchain id. |
| `network` | components.GlobalParamNetwork | No       | A supported network type, either mainnet or a testnet.   |

Example

```javascript theme={null}
import { Avalanche } from "@avalanche-sdk/chainkit";

const avalancheSDK = new Avalanche({
  apiKey: "<YOUR_API_KEY_HERE>",
  chainId: "43114", // Sets chainId globally, will be used if not passed during method call.
  network: "mainnet",
});

async function run() {
  const result = await avalancheSDK.data.evm.blocks.get({
    blockId:
      "0x17533aeb5193378b9ff441d61728e7a2ebaf10f61fd5310759451627dfca2e7c",
    chainId: "<YOUR_CHAIN_ID>", // Override the globally set chain id.
  });

  // Handle the result
  console.log(result);
}

run();
```