Mastering OAuth2 Login in the Frontend: Full Flowchart and Common Pitfalls
This article walks through the complete OAuth2 Authorization Code flow with PKCE for front‑end applications, explains each step with code examples, highlights six frequent pitfalls such as redirect_uri mismatches, missing state validation, PKCE requirements, one‑time code usage, URL leakage, and insecure token storage, and provides a ready‑to‑use implementation template.
