ThunderID helper for Better Auth (@thunderid/better-auth)

[brionmario]

Purpose

Introduces @thunderid/better-auth, a community provider helper that returns a typed GenericOAuthConfig for a ThunderID issuer to use with Better Auth's generic-oauth plugin.

Approach

All OAuth 2.0 / OIDC handling is performed by Better Auth itself, so there is no ThunderID SDK dependency or protocol logic to keep in sync.

The callback route registered with ThunderID is /callback/:providerId, not /oauth2/callback/:providerId, matching the Generic OAuth plugin's core callback route (verified against a running sample app sign-in).

Related Issues

• Integration: Contribute ThunderID as a pre-configured Better Auth provider thunderid#3559

Related PRs

• N/A

Checklist

• Followed the contribution guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Tests provided. (Add links if there are any)
  • Unit Tests
  • Integration Tests
• Breaking changes. (Fill if applicable)
  • Breaking changes section filled.
  • breaking change label added.

Security checks

• Followed secure coding standards.
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Team

Run ID: 7643a376-5231-4b49-9f56-b2f1dfa837ac

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}