Help Center/Object Storage Service/Node.js SDK Developer Guide (Ally Region)/Bucket Management (SDK for Node.js)/Obtaining the Storage Class of a Bucket (SDK for Node.js)
Updated on 2026-01-16 GMT+08:00
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Obtaining the Storage Class of a Bucket (SDK for Node.js)

Function

This API returns the storage class of a bucket.

Restrictions

  • To obtain a bucket's storage class, you must be the bucket owner or have the required permission (obs:bucket:GetBucketStoragePolicy in IAM or GetBucketStoragePolicy in a bucket policy).

Method

ObsClient.getBucketStoragePolicy(params)

Request Parameters

Table 1 BucketRequestInput

Parameter

Type

Mandatory (Yes/No)

Description

Bucket

string

Yes

Explanation:

Bucket name.

Restrictions:

  • A bucket name must be unique across all accounts and regions.
  • A bucket name:
    • Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed.
    • Cannot be formatted as an IP address.
    • Cannot start or end with a hyphen (-) or period (.).
    • Cannot contain two consecutive periods (..), for example, my..bucket.
    • Cannot contain a period (.) and a hyphen (-) adjacent to each other, for example, my-.bucket or my.-bucket.
  • If you repeatedly create buckets with the same name in the same region, no error will be reported, and the bucket attributes comply with those set in the first creation request.

Value range:

The value can contain 3 to 63 characters.

Default value:

None

Responses

Table 2 Responses

Type

Description

Table 3

NOTE:

This API returns a Promise response, which requires the Promise or async/await syntax.

Explanation:

Returned results. For details, see Table 3.

Table 3 Response

Parameter

Type

Description

CommonMsg

ICommonMsg

Explanation:

Common information generated after an API call is complete, including the HTTP status code and error code. For details, see Table 4.

InterfaceResult

GetBucketMetadataOutput

Explanation:

Results outputted for a successful call. For details, see Table 5.

Restrictions:

This parameter is not included if the value of Status is greater than 300.

Table 4 ICommonMsg

Parameter

Type

Description

Status

number

Explanation:

HTTP status code returned by the OBS server.

Value range:

A status code is a group of digits indicating the status of a response. It ranges from 2xx (indicating successes) to 4xx or 5xx (indicating errors).

Code

string

Explanation:

Error code returned by the OBS server.

Message

string

Explanation:

Error description returned by the OBS server.

HostId

string

Explanation:

Request server ID returned by the OBS server.

RequestId

string

Explanation:

Request ID returned by the OBS server.

Id2

string

Explanation:

Request ID2 returned by the OBS server.

Indicator

string

Explanation:

Error code details returned by the OBS server.

Table 5 GetBucketStorageClassOutput

Parameter

Type

Description

RequestId

string

Explanation:

Request ID returned by the OBS server

StorageClass

StorageClassType

Explanation:

Storage class of the bucket.

Value range:

See Table 6.

Table 6 StorageClassType

Constant

Default Value

Description

ObsClient.enums.StorageClassStandard

STANDARD

Standard storage class.

Features low access latency and high throughput and is used for storing massive, frequently accessed (multiple times a month) or small objects (< 1 MB) requiring quick response.

ObsClient.enums.StorageClassWarm

WARM

Warm storage class.

Used for storing data that is semi-frequently accessed (fewer than 12 times a year) but becomes instantly available when needed.

ObsClient.enums.StorageClassCold

COLD

Cold storage class.

Used for storing rarely accessed (once a year) data.

Code Examples

You can call ObsClient.getBucketStoragePolicy to obtain the storage class of a bucket. This example uses bucket examplebucket.

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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 instance of ObsClient.
const obsClient = new ObsClient({
  //Obtain an AK/SK pair using environment variables or import an AK/SK pair in other ways. Using hard coding may result in leakage.
  //Obtain an AK/SK pair on the management console.
  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 advised not 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 of the region where the bucket is located.
  server: "https://your-endpoint"
});

async function getBucketStoragePolicy() {
  try {
    const params = {
      // Specify the bucket name.
      Bucket: "examplebucket"
    };
    // Obtain the storage class of the bucket.
    const result = await obsClient.getBucketStoragePolicy(params);
    if (result.CommonMsg.Status <= 300) {
      console.log("Get bucket(%s)'s storage-class successful!", params.Bucket);
      console.log("RequestId: %s", result.CommonMsg.RequestId);
      console.log('StorageClass: %s', result.InterfaceResult.StorageClass);
      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);
  };
};

getBucketStoragePolicy();