JWT Decoder
Decode any JSON Web Token instantly. Inspect the header, payload claims, and expiry time — all in your browser.
🔵 Header
🟢 Payload
🟠 Signature
How to Use the JWT Decoder
- Paste JWT Token — Paste your full JWT token string into the input field.
- Click Decode — Click the Decode Token button to parse the token instantly.
- View Sections — Inspect the decoded Header, Payload, and Signature sections separately.
- Check Expiry — Review the expiry time and other claims displayed in the payload section.
Key Features
100% Private
All decoding happens in your browser. Your JWT token is never sent to any server.
Expiry Detection
Automatically detects the exp claim and shows whether your token is valid or expired.
Color-Coded Parts
Header, payload, and signature are displayed in distinct colors for easy reading.
Pretty JSON
Decoded payload and header are formatted as readable pretty-printed JSON.
Instant Results
Token decoding happens in milliseconds with zero network requests.
Any JWT Format
Works with tokens from any framework — Node.js, Laravel, Django, Spring Boot, and more.
JWT Token Structure
A JSON Web Token consists of three parts separated by dots. Each part is Base64Url encoded:
Example:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9 ← Header
.eyJzdWIiOiIxMjM0NTY3ODkwIn0 ← Payload
.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV ← Signature
Header: Contains the token type (JWT) and signing algorithm (e.g., HS256, RS256).
Payload: Contains the claims — registered claims like sub, iat, exp, and custom claims like user ID or roles.
Signature: Created by signing the encoded header and payload with a secret. This tool displays it but does not verify it (that requires the private secret key).
Practical Examples
🇮🇳 Vikram — Hyderabad, India (API Developer)
Vikram is debugging an authentication issue in his Node.js API. He decodes the JWT from the Authorization header to check which user ID is embedded in the sub claim and whether the token has expired.
🇮🇳 Sneha — Bengaluru, India (Frontend Developer)
Sneha builds a React app and needs to read the user's role from the JWT stored in localStorage to show/hide admin UI elements. She uses this tool to confirm which claims her backend is sending.
🇬🇧 James — London, UK (Security Auditor)
James is reviewing an app's JWT implementation. He decodes tokens from the test environment to verify that sensitive data like passwords is not accidentally included in the payload claims.
What is a JWT Token?
JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs are widely used for authentication and authorization in web applications and APIs.
When a user logs in, the server creates a JWT containing the user's identity and permissions, signs it with a secret, and sends it to the client. The client includes this token in subsequent requests. The server verifies the token's signature to authenticate the user without needing to store session data.
📖 Want a complete guide on JWT tokens and authentication?
Read Our Complete JWT Guide →Frequently Asked Questions
Is this JWT Decoder tool free?
Is it safe to paste my JWT here?
Does this tool verify the JWT signature?
What is the structure of a JWT?
What does the exp claim mean in JWT?
Can I decode tokens from any framework?
What algorithms does JWT support?
What should I never put in a JWT payload?
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