Gmail JS API - OAuth2 Error invalid_scope

Question

I am new to GMail JS API and I was trying to read gmail emails using Javascript according to the quickstart tutorial given explained on below link

https://developers.google.com/gmail/api/quickstart/js

I have followed all the instructions given on the page but I am getting below error

did I miss something???

Please help me resolve this error

Thanks in advance!!!

Answer 1

You may refer with this thread. Make sure that you are authenticated to the API properly.

To do this, there are two ways:

• use OAuth - the Server redirects the user to google's servers, where they can login, grant permission to your app, and pass a token back to you
• Service Accounts. These are a little bit more complicated:
  • First, you'll have to setup an app (done)
  • second, you'll have to setup a service account. This is how your app authenticates to google. you've done that, and the certificate you've got contains the private key to authenticate
  • third, the user needs to grant your application access to act on behalf of them. This is the point you haven't done yet.

Also, as stated here, certain scopes simply aren't supported for the oauth2 for devices flow.

Additional references:

• Invalid scope error when trying to access gmail api

  You may refer with this thread.

  As per the announcement on May 11, 2017, publicly available applications with access to certain user data must pass review. If you see an access error for your app, submit a request using our OAuth Developer Verification form.

  For personal-use apps and those you are testing, join the Google group Risky Access Permissions By Unreviewed Apps, which allows you to approve data access for personal and testing accounts. See the Google API Services User Data Policy for more information.

  This blog about how to fix this error might be also helpful.

• OAuth invalid scope