Last updated: April 13, 2026
JWT Decoder for TypeScript Developers
Quick Answer
DevToolHQ's jwt decoder works great alongside TypeScript. Use it to quickly jwt decoder during development, then integrate the pattern into your TypeScript codebase using the code example below.
Use Cases in TypeScript
- 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
TypeScript Code Example
import { jwtVerify, SignJWT } from 'jose'; // npm install jose
const secret = new TextEncoder().encode(process.env.JWT_SECRET!);
// Sign a JWT
async function signToken(userId: string, role: string): Promise<string> {
return new SignJWT({ userId, role })
.setProtectedHeader({ alg: 'HS256' })
.setIssuedAt()
.setExpirationTime('1h')
.sign(secret);
}
// Verify + typed payload
interface JWTPayload { userId: string; role: string }
async function verifyToken(token: string): Promise<JWTPayload> {
const { payload } = await jwtVerify(token, secret);
return payload as unknown as JWTPayload;
}Try the tool directly
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Frequently Asked Questions
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