Mock AWS S3 SDK for Node.js

Usage no npm install needed!

<script type="module">
  import seikhoMockAwsS3 from 'https://cdn.skypack.dev/@seikho/mock-aws-s3';



This is a very simple interface that mocks the AWS SDK for Node.js. The implementation is incomplete but most basic features are supported.


  • createBucket
  • listObjects
  • listObjectsV2
  • deleteObjects
  • deleteObject
  • getObject
  • headObject
  • putObject
  • copyObject
  • getObjectTagging
  • putObjectTagging
  • upload

It uses a directory to mock a bucket and its content.

If you'd like to see some more features or you have some suggestions, feel free to use the issues or submit a pull request.

Release History

  • 2017-08-11   v2.6.0   Contributions from @pamelafox and @fkleon adding support for listObjectsV2, tagging and more useful debug info returned
  • 2017-05-31   v2.5.1   Fix bug when statSync was called on non existing files, spotted by @AllanHodkinson
  • 2017-05-20   v2.5.0   Set LastModified on getObject by @stujo, support for custom metadata on get/head by @rgparkins and putObject returns some data on error by @pamelafox
  • 2017-02-02   v2.4.0   Account for no existing keys when getting an object by @derPuntigamer
  • 2016-06-03   v2.3.0   Add createBucket method and tests by @neilstuartcraig
  • 2016-05-25   v2.2.1   Add Size attribute by @aldafu
  • 2016-04-25   v2.2.0   Add MaxKey options in listObject by @hauboldj
  • 2016-01-18   v2.1.0   Fix markers on listObjects (by @wellsjo) and add send method (by @AllieRays and @IonicaBizau)
  • 2015-11-04   v2.0.0   Static basePath configuration, bound params (by @CJNE) and match upload API (by @kyleseely)
  • 2015-10-25   v1.1.0   Removed because of potential breaking change with bound params
  • 2015-09-24   v1.0.0   Breaking changes and awesome PR to fix API inconsistencies by @irothschild
  • 2015-08-27   v0.5.0   Refactor and default options by @whitingj
  • 2015-07-28   v0.4.0   Add headObject method by @mdlavin
  • 2015-07-21   v0.3.0   Add CommonPrefixes to listObjects by @jakepruitt
  • 2015-03-15   v0.2.7   Mock out AWS' config submodule by @necaris
  • 2015-03-13   v0.2.6   Partial match support and ContentLength by @mick
  • 2015-03-03   v0.2.5   Allow string and fix tests by @lbud
  • 2015-02-05   v0.2.4   Fix url encoding for copy by @ahageali
  • 2015-01-22   v0.2.3   Support for copyObject
  • 2014-02-02   v0.2.1   Support for deleteObject
  • 2014-01-08   v0.2.0   Support streams for getObject/putObject
  • 2013-10-24   v0.1.2   Fix isTruncated typo
  • 2013-10-09   v0.1.1   Add LastModified to listObject
  • 2013-08-09   v0.1.0   First release


var AWSMock = require('mock-aws-s3')
AWSMock.config.basePath = '/tmp/buckets/' // Can configure a basePath for your local buckets
var s3 = AWSMock.S3({
  params: { Bucket: 'example' },
  { Key: 'sea/animal.json', Body: '{"is dog":false,"name":"otter","stringified object?":true}' },
  function (err, data) {
    s3.listObjects({ Prefix: 'sea' }, function (err, data) {