Last updated: April 13, 2026
JWT Decoder for Next.js Developers
Quick Answer
DevToolHQ's jwt decoder works great alongside Next.js. Use it to quickly jwt decoder during development, then integrate the pattern into your Next.js codebase using the code example below.
Use Cases in Next.js
- 1.Verify user authentication tokens
- 2.Debug token expiration and claims
- 3.Implement role-based access control from JWT claims
- 4.Validate tokens from third-party auth providers
Next.js Code Example
// Decode and verify JWTs in Next.js middleware
import { jwtVerify } from 'jose';
export async function middleware(request: Request) {
const token = request.headers.get('authorization')?.split(' ')[1];
if (!token) return new Response('Unauthorized', { status: 401 });
try {
const { payload } = await jwtVerify(
token,
new TextEncoder().encode(process.env.JWT_SECRET)
);
console.log('User ID:', payload.sub);
} catch {
return new Response('Invalid token', { status: 403 });
}
}Try the tool directly
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