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Here I have compiled my understanding of React Query (TanStack Query) over the months and simplified it into my personal study reference. This is mainly written for myself, but I believe it can also serve as a good starting guide for someone who is new to learning TanStack Query.
Normally, all state updates in React are urgent. If you click a button or type in an input and it triggers a slow render, the browser freezes until the render is complete. useTransition fixes this by making updates "non-urgent" (interruptible).
React automatically memoizes fetch() GET requests during a render. This means that if the same fetch() request is made multiple times with the same arguments within the same render, React performs the network request only once and reuses the result for subsequent calls.
In this article, we'll build GitHub OAuth Authentication from scratch without relying on authentication libraries like Auth.js or NextAuth. The goal is not just to get it working, but to understand what actually happens behind the scenes whenever a user clicks "Continue with GitHub".
In the previous article, we built the authorization route and redirected users to GitHub for authentication. Now we'll handle the callback from GitHub, exchange the authorization code for an access token, retrieve the user's information, create or link the account in our database, and finally create a session.
Learn how TOTP-based 2FA works from the ground up using otplib and qrcode