Help Center/ Object Storage Service/ SDK Reference/ Node.js/ Object APIs (SDK for Node.js)/ Basic Operations (SDK for Node.js)/ Object Upload (SDK for Node.js)/ Data Consistency Verification (SDK for Node.js)
Updated on 2026-07-22 GMT+08:00
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Data Consistency Verification (SDK for Node.js)

If you have any questions during development, post them on the Issues page of GitHub.

You can use MD5 to verify file consistency during uploads through the following APIs:

Sample Code

This example uses MD5 to verify data consistency during an append upload. 
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// Import the OBS library.
// Use npm to install the client.
const ObsClient = require("esdk-obs-nodejs");
// Use the source code to install the client.
// var ObsClient = require('./lib/obs');

// Create an ObsClient instance.
const obsClient = new ObsClient({
  // Obtain an AK and SK pair using environment variables (recommended) or import it in other ways. Using hard coding may result in leakage.
  // Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
  access_key_id: process.env.ACCESS_KEY_ID,
  secret_access_key: process.env.SECRET_ACCESS_KEY,
  // (Optional) If you use a temporary AK/SK pair and a security token to access OBS, you are not advised to use hard coding, which may result in information leakage. You can obtain an AK/SK pair using environment variables or import an AK/SK pair in other ways.
  // security_token: process.env.SECURITY_TOKEN,
  // Enter the endpoint corresponding to the bucket. CN-Hong Kong is used here as an example. Replace it with the one currently in use.
  server: "https://obs.ap-southeast-1.myhuaweicloud.com"
});

async function putObject() {
  try {
    const params = {
      // Specify the bucket name.
      Bucket: "examplebucket",
      // Specify an object. example/objectname is used in this example.
      Key: "example/objectname",
      // localfile indicates the path of the local file to be uploaded, which must include the file name.
      SourceFile : 'localfile',
      // Base64-encoded, 128-bit MD5 value of the data upload request body.
      ContentMD5 : 'n58IG6hfM7vqI4K0vnWpog=='
    };
    // Upload the file.
    const result = await obsClient.putObject(params);
    if (result.CommonMsg.Status <= 300) {
      console.log("Put bucket(%s) successful!", params.Bucket);
      console.log("RequestId: %s", result.CommonMsg.RequestId);
      return;
    };
    console.log("An ObsError was found, which means your request sent to OBS was rejected with an error response.");
    console.log("Status: %d", result.CommonMsg.Status);
    console.log("Code: %s", result.CommonMsg.Code);
    console.log("Message: %s", result.CommonMsg.Message);
    console.log("RequestId: %s", result.CommonMsg.RequestId);
  } catch (error) {
    console.log("An Exception was found, which means the client encountered an internal problem when attempting to communicate with OBS, for example, the client was unable to access the network.");
    console.log(error);
  };
};

putObject();