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backblaze-b2 v1.0.2

Node.js Library for the Backblaze B2 Storage Service

Backblaze B2 Node.js Library

npm version Build Status

This library uses promises, so all actions on a B2 instance return a promise in the following pattern

b2.instanceFunction(arg1, arg2).then(
    successFn(response) { ... },
    errorFn(err) { ... }

Status of project

See the CHANGELOG for a history of updates.

Contributing and Suggestions for Changes and Fixes

Contributions and questions are welcome. If you are looking for something to help with, please have a look at the ISSUES or add an issue if there is something you would like to see or fix.

Make sure you use the .editorconfig in your IDE/editor when writing code.

Pull Requests should include:

  • Updated example in
  • Update exiting tests, or add new tests to cover code changes

If you are adding tests, add these to /test/unit. Make sure the test is named fooTest.js and is located in a similar folder to the node module that is being tested.

Always run npm test before you commit.

Upgrading from 0.9.x to 1.0.x

For this update, we've switched the back end HTTP request library from request to axios as it has better Promise and progress support built in. However, there are a couple changes that will break your code and ruin your day. Here are the changes:

  • The Promise resolution has a different data structure. Where previously, the request response data was the root object in the promise resolution (res), this data now resides in
  • In v0.9.12, we added request progress reporting via the third parameter to then(). Because we are no longer using the same promise library, this functionality has been removed. However, progress reporting is still available by passing a callback function into the b2.method() that you're calling. See the documentation below for details.
  • In v0.9.x, b2.downloadFileById() accepted a fileId parameter as a String or Number. As of 1.0.0, the first parameter is now expected to be a plain Object of arguments.


var B2 = require('backblaze-b2');

// All functions on the b2 instance return the response from the B2 API in the success callback
// i.e. {})

// create b2 object instance
var b2 = new B2({
    accountId: 'accountId',
    applicationKey: 'applicationKey'

// authorize with provided credentials
b2.authorize();  // returns promise

// create bucket
  bucketType // one of `allPublic`, `allPrivate`
);  // returns promise

// delete bucket
b2.deleteBucket(bucketId);  // returns promise

// list buckets
b2.listBuckets();  // returns promise

// update bucket2
b2.updateBucket(bucketId, bucketType);  // returns promise

// get upload url
b2.getUploadUrl(bucketId);  // returns promise

// upload file
    uploadUrl: 'uploadUrl',
    uploadAuthToken: 'uploadAuthToken',
    filename: 'filename',
    mime: '', // optonal mime type, will default to 'b2/x-auto' if not provided
    data: 'data' // this is expecting a Buffer not an encoded string,
    info: {
        // optional info headers, prepended with X-Bz-Info- when sent, throws error if more than 10 keys set
        // valid characters should be a-z, A-Z and '-', all other characters will cause an error to be thrown
        key1: value
        key2: value
    onUploadProgress: function(event) || null // progress monitoring
});  // returns promise

// list file names
    bucketId: 'bucketId',
    startFileName: 'startFileName',
    maxFileCount: 100,
    delimiter: '',
    prefix: ''
});  // returns promise

// list file versions
    bucketId: 'bucketId',
    startFileName: 'startFileName',
    maxFileCount: 100
});  // returns promise

// hide file
    bucketId: 'bucketId',
    fileName: 'fileName'
});  // returns promise

// get file info
b2.getFileInfo(fileId);  // returns promise

// download file by name
    bucketName: 'bucketName',
    fileName: 'fileName',
    onDownloadProgress: function(event) || null // progress monitoring
});  // returns promise

// download file by fileId
  fileId: 'fileId',
  onDownloadProgress: function(event) || null // progress monitoring
});  // returns promise

// delete file version
    fileId: 'fileId',
    fileName: 'fileName'
});  // returns promise

// start large file
  bucketId: 'bucketId',
  fileName: 'fileName'
}) // returns promise

// get upload part url
  fileId: 'fileId'
}) // returns promise

// get upload part
  partNumber: 'partNumber', // A number from 1 to 10000
  uploadUrl: 'uploadUrl',
  uploadAuthToken: 'uploadAuthToken', // comes from getUploadPartUrl();
  data: Buffer // this is expecting a Buffer not an encoded string,
  onUploadProgress: function(event) || null // progress monitoring
}) // returns promise

// finish large file
  fileId: 'fileId',
  partSha1Array: [partSha1Array] // array of sha1 for each part
}) // returns promise

// cancel large file
  fileId: 'fileId'
}) // returns promise


  • Yakov Khalinsky (@yakovkhalinsky)
  • Ivan Kalinin (@IvanKalinin) at Isolary
  • Brandon Patton (@crazyscience) at Isolary
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