When implementing Social Login (Google, GitHub), many developers assume that the heavy lifting is handled by the provider. The truth is: the integration layer is where your system is most vulnerable. To tackle these vulnerabilities head-on, we must rethink the integration. Here is how to build a bulletproof, Zero-Trust social login architecture. The Pitfall 1: The Black Box Dependency Libraries like Passport.js are incredibly popular, but they wrap the OAuth flow into a "black box." In enterprise environments, you need total auditability. We opted for a custom Axios implementation. This reduces the attack surface and allows precise domain-level error handling. // https://github.com/paudang/nodejs-social-auth/blob/main/src/infrastructure/auth/socialAuthService.ts export class GoogleProvider implements ISocialProvider { name = ' Google ' ; async getProfile ( code : string , redirectUri : string ): Promise < ISocialProfile > { const params = new URLSearchParams (); params .…