Free Online JWT Decoder – Inspect JSON Web Tokens
Decode and explore JWT tokens instantly. View header, payload claims, expiry status, and signature — all in your browser.
Hey there! JSON Web Tokens (JWTs) are used everywhere for authentication and secure data exchange. Our free JWT Decoder helps you quickly understand what’s inside a token without sending it anywhere. Just paste your JWT and see the header, payload, and signature broken down clearly.
Everything runs locally in your browser — 100% private and secure.
What is a JWT Token?
A JWT (JSON Web Token) is a compact, URL-safe string used to securely pass information between systems. It consists of three parts separated by dots:
- Header – Contains the algorithm and token type
- Payload – Contains the actual data (claims) like user ID, role, expiry time, etc.
- Signature – Used to verify the token hasn’t been tampered with
What This Tool Shows You
- Beautifully formatted Header and Payload as JSON
- All important claims (sub, iss, exp, iat, role, email, etc.)
- Automatic expiry check — tells you if the token is still valid or has expired
- Visual breakdown of the three token segments
- Raw Base64 for each part with one-click copy
- Algorithm used (HS256, RS256, etc.)
When Should You Use the JWT Decoder?
- Debugging authentication issues in your app
- Inspecting tokens received from APIs or login responses
- Checking user claims, roles, and permissions
- Verifying expiry and issued-at times
- Understanding third-party JWTs during development
How to Decode a JWT in 3 Simple Steps
- Paste your JWT token into the input box.
- Click “Decode JWT” or let it decode automatically as you type.
- Explore the nicely formatted Header, Payload, and Signature sections.
Key Features
- Real-time decoding as you paste
- Clear visual separation of Header, Payload, and Signature
- Automatic expiry status with colored badges
- Pretty-printed JSON for easy reading
- One-click copy for raw parts or payload
- Helpful sample token to try instantly
- 100% client-side — your token never leaves your device
Important Security Note
This tool only **decodes** the token. It does **not** verify the signature. Always validate JWTs on your server using the proper secret key before trusting the payload in production.
Pro Tips
- Use the sample button to see a realistic JWT with common claims
- Check the “exp” claim to know exactly when the token expires
- Copy the payload directly if you need to inspect the claims quickly
- Never share real tokens containing sensitive information
Why Developers Love This JWT Decoder
- Forever free with no limits or ads
- Fast, clean, and easy to understand
- Beautiful visual token breakdown
- Works perfectly on desktop and mobile
- Completely private — nothing is sent to any server
Ready to Inspect Your JWT?
Stop guessing what’s inside your tokens. Decode and understand them instantly.
→ Decode Your JWT Token Now – Free & Private