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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

TypeScript
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;
}

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Open Jwt Decoder

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