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Implement Google SSO (OAuth2) – Backend #82
Description
Priority: High
Difficulty: Advanced
Type: Backend Feature
Description:
Set up Google Single Sign-On (SSO) in the CoreX backend. The goal is to allow users to register/login with their Google account.
Requirements:
- Install and configure Google OAuth 2.0:
- Either with
passport-google-oauth20orgoogle-auth-library.
- Either with
- Create endpoints:
GET /auth/google– redirect to Google login.GET /auth/google/callback– handle Google’s response.
- Flow:
- Verify Google profile (
id,email,name). - If user exists → return JWT.
- If new user → create in MongoDB (
authProvider: 'google'), then return JWT.
- Verify Google profile (
- Securely store required environment variables:
GOOGLE_CLIENT_IDGOOGLE_CLIENT_SECRETGOOGLE_CALLBACK_URL
- Document usage in README.
Acceptance Criteria:
- User can authenticate with Google and receive a JWT.
- New Google users are automatically saved in DB.
- Errors (invalid token, failure to fetch user) are handled.
- API is documented for frontend use.
Activity
its-Pratik-15 commentedon Oct 5, 2025
i want to contribute assign me this task
Alexandrbig1 commentedon Oct 5, 2025
@its-Pratik-15, are you sure you'll be able to implement this task? Have you experience with this task?
its-Pratik-15 commentedon Oct 5, 2025
I recently learned about OAuth in college, and I’d love to try implementing it!
Gautam-Bharadwaj commentedon Oct 6, 2025
@Alexandrbig1 Sir, I would like to request this project. I have the experience and am confident I can complete it successfully.
dikamjit-borah commentedon Oct 6, 2025
Hi @Alexandrbig1 I would like to work on this feature. I have experience building authentication systems in Node.js/Express backends.
2 remaining items
Alexandrbig1 commentedon Oct 6, 2025
@JHAJI01, thanks for your interest. I've assigned this task to another contributor. Please, feel free to find a task that matches your stack and let me know in the comments section of this task.
Alexandrbig1 commentedon Oct 6, 2025
@its-Pratik-15, this task was assigned to another contributor. Please feel free to find an open task and leave a comment, and I'll assign you there.
dikamjit-borah commentedon Oct 6, 2025
@Alexandrbig1 Thanks, I will get started on this.
Ankit-Kum-ar commentedon Oct 9, 2025
Hi @dikamjit-borah, I wanted to ask how far you've reached with the task because I need to implement it on the frontend as well, so I need the backend to be ready. I've already created the basic code structure.
CC: @Alexandrbig1
Alexandrbig1 commentedon Oct 9, 2025
Hi @dikamjit-borah, any updates?
dikamjit-borah commentedon Oct 9, 2025
Hi @Alexandrbig1, Its almost done, I will raise a PR by tomorrow.
Alexandrbig1 commentedon Oct 11, 2025
@dikamjit-borah, was completed in a PR on the backend repository. Thank you to the contributor for your work!
dikamjit-borah commentedon Oct 12, 2025
@all-contributors please add @dikamjit-borah for code
Alexandrbig1 commentedon Oct 12, 2025
@dikamjit-borah, please leave a comment for the bot in your approved PR.
Alexandrbig1 commentedon Oct 15, 2025
Hey @dikamjit-borah ,
🎉 Congratulations — your pull request has been merged!
Thank you for your contribution to the CoreX Project as part of Open Code Chicago during Hacktoberfest 2025
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