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uplaod file in s3 from heroku for node js

In order for your application to access the AWS credentials for signing upload requests, they will need to be added as configuration variables in Heroku:

heroku config:set AWS_ACCESS_KEY_ID=xxx AWS_SECRET_ACCESS_KEY=yyy
Adding config vars and restarting app... done, v21
    AWS_ACCESS_KEY_ID => xxx
    AWS_SECRET_ACCESS_KEY => yyy
In addition to the AWS access credentials, set your target S3 bucket’s name:

heroku config:set S3_BUCKET=zzz
Adding config vars and restarting app... done, v21
    S3_BUCKET     => zzz