Developer Details Five Integration Bugs Found After Building a Complete Next.js Auth System

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A developer building a full authentication kit for Next.js 16 — covering email/password login, OAuth, email verification, and role-based routing — encountered five integration bugs that only surfaced once all components were connected. The first bug involved session cookies written via client-side JavaScript silently disappearing in certain browser and timing conditions on localhost. The fix required moving cookie creation server-side using NextResponse.cookies.set with the httpOnly flag, preventing client scripts from accessing or interfering with the token. A second bug emerged when client-side navigation via router.push bypassed the proxy layer entirely, since no real HTTP request was made and the proxy could not validate what it never received. The author notes these were not architectural flaws but wiring errors — problems that only become visible when real user flows run through a fully assembled system.

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