// Import SDK, if the TOS Node.JS SDK version is less than 2.5.2, please change "TosClient" to "TOS" in the code below.​
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos-sdk';​
​
// Create a client.​
const client = new TosClient({​
  accessKeyId: process.env['TOS_ACCESS_KEY'],​
  accessKeySecret: process.env['TOS_SECRET_KEY'],​
  region: "Provide your region", // Fill in the region where the Bucket is located. For example, if it is in China North 2 (Beijing), fill in "Provide your region" as cn-beijing.​
  endpoint: "Provide your endpoint", // Enter the domain address.​
});​
​
function handleError(error) {​
  if (error instanceof TosClientError) {​
    console.log('Client Err Msg:', error.message);​
    console.log('Client Err Stack:', error.stack);​
  } else if (error instanceof TosServerError) {​
    console.log('Request ID:', error.requestId);​
    console.log('Response Status Code:', error.statusCode);​
    console.log('Response Header:', error.headers);​
    console.log('Response Err Code:', error.code);​
    console.log('Response Err Msg:', error.message);​
  } else {​
    console.log('unexpected exception, message: ', error);​
  }​
}​
​
async function main() {​
  try {​
    const bucketName = 'node-sdk-test-bucket';​
    // Object name in the storage bucket.​
    const objectKey = 'example_dir/example.txt';​
​
    const { requestId } = await client.headObject({​
      bucket: bucketName,​
      key: objectKey,​
    });​
    console.log('The object exists.');​
    console.log('headObject Request ID:', requestId);​
  } catch (error) {​
    if (error instanceof TosServerError) {​
      if (error.statusCode === 404) {​
        // The object does not exist.​
        console.log(`The object doesn't exist`);​
        return;​
      }​
    }​
​
    handleError(error);​
  }​
}​
​
main();​