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Code X Savage
Code X Savage

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I Spent Hours Debugging better-auth OAuth… Because I Overthought It

We’ve all been there: you’re building a Next.js app, hit a wall, and spend hours questioning your entire tech stack—only to realize you overthought the whole thing.
​Recently, I was setting up Google OAuth using better-auth. I followed the docs, which clearly showed the authClient.signIn.social() method.

*​The Next.js Rabbit Hole
*

​My brain made an assumption: "If there is a sign-in endpoint, there must be a separate sign-up endpoint for new users." Believing this, I spent hours debugging and pointing fingers at everything:
​Is better-auth bugged?
​Is react-hook-form failing to pass data?
​Is my database schema blocking new users?

*​The Fix
*

​I completely overthought it. In better-auth, signIn handles both sign-in AND sign-up automatically. If a user doesn't exist, it creates them. There is no separate sign-up endpoint for OAuth. I was just hitting the wrong endpoint.
​The Lesson
​If the docs only show one method for OAuth, trust it! It does it all.
​Save yourself the headache and don't look for a sign-up endpoint that doesn't exist. 😂

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