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How to Get credentials.json for Gmail API

The GMAIL_CREDENTIALS_FILE refers to the OAuth 2.0 Client ID JSON file that allows this application to access your Gmail account securely.

Step-by-Step Guide

1. Create a Project in Google Cloud Console

  1. Go to the Google Cloud Console.
  2. Click the project dropdown (top left) and select New Project.
  3. Name it (e.g., "RAG Support Bot") and click Create.

2. Enable the Gmail API

  1. In the sidebar, go to APIs & Services > Library.
  2. Search for "Gmail API".
  3. Click on it and click Enable.

3. Configure OAuth Consent Screen

  1. Go to APIs & Services > OAuth consent screen.
  2. Select External (unless you have a Google Workspace organization, then Internal is fine). Click Create.
  3. App Information: Fill in App Name (e.g., "Support Bot") and User Support Email.
  4. Developer Contact: Add your email.
  5. Click Save and Continue.
  6. Scopes: Click Add or Remove Scopes. Search for gmail.modify and select it. Click Update, then Save and Continue.
  7. Test Users: Click Add Users and add the Gmail address you want to use for sending emails. This is crucial.
  8. Click Save and Continue.

4. Create Credentials

  1. Go to APIs & Services > Credentials.
  2. Click + CREATE CREDENTIALS > OAuth client ID.
  3. Application type: Select Desktop app.
  4. Name it (e.g., "Python Client").
  5. Click Create.

5. Download the JSON File

  1. You will see a pop-up "OAuth client created".
  2. Click the Download JSON button (icon with a down arrow).
  3. Save this file to your project folder: /Users/nayaneshgupte/AI Projects/RAG Demo/.
  4. Rename the file to credentials.json.

Final Check

Your project folder should now contain:

  • main.py
  • .env
  • credentials.json <--- The file you just downloaded.