JWT Decoder & Verifier
Decode, verify, and validate JSON Web Tokens (JWT). Inspect headers, payloads, and verify signatures with detailed analysis.
JWT Token
Header
Payload
Signature Verification
Claims Analysis
Features
- Decode JWT headers and payloads
- Verify signatures with HMAC, RSA, and ECDSA
- Analyze standard and custom claims
- Validate token expiration and timing
- Copy decoded sections to clipboard
- Client-side processing for security
What is a JWT Decoder and Why Do You Need One?
A JWT decoder is an essential online tool that decodes and verifies JSON Web Tokens (JWT), the industry-standard method for securely transmitting information between parties. Whether you're a developer debugging authentication systems, a security professional analyzing tokens, or a programmer integrating JWT-based APIs, our free JWT decoder and verifier simplifies your workflow by making JWT data readable and verifiable.
JSON Web Tokens have become the standard for stateless authentication in modern web applications, APIs, and microservices. However, JWTs are encoded in a compact format that's difficult to read and debug. This is where an online JWT decoder becomes invaluable – it instantly decodes your JWT tokens, validates their structure, verifies signatures, and helps you analyze claims and expiration times.
Our advanced JWT verifier goes beyond simple decoding. It provides comprehensive signature verification, claims analysis, expiration validation, and detailed error reporting. Best of all, everything happens directly in your browser, ensuring your sensitive tokens never leave your device.
Powerful Features of Our JWT Decoder Tool
🔓 JWT Decoding
Instantly decode JWT headers and payloads to inspect algorithm information, claims, and token metadata. View the decoded JSON in a beautifully formatted, readable format.
✅ Signature Verification
Verify JWT signatures using HMAC (HS256, HS384, HS512), RSA (RS256, RS384, RS512), and ECDSA algorithms. Ensure token integrity and authenticity with your secret keys or public keys.
📊 Claims Analysis
Analyze standard JWT claims (iss, sub, aud, exp, nbf, iat, jti) and custom claims. Get detailed information about token expiration, validity periods, and claim values.
🔒 Privacy & Security
All processing happens locally in your browser. Your JWT tokens and secret keys never leave your device, ensuring complete privacy and security for sensitive authentication data.
Benefits for Developers, Security Professionals, and DevOps Teams
👨💻 For Developers
- • Debug authentication issues quickly
- • Validate JWT token structure
- • Test token expiration and claims
- • Verify API authentication tokens
- • Inspect third-party JWT tokens
🔐 For Security Professionals
- • Analyze JWT security implementations
- • Verify signature algorithms and keys
- • Audit token claims and permissions
- • Test JWT vulnerability assessments
- • Validate token expiration policies
⚙️ For DevOps Teams
- • Monitor authentication token health
- • Debug microservice authentication
- • Validate service-to-service tokens
- • Test JWT-based API gateways
- • Troubleshoot SSO implementations
How to Use Our Online JWT Decoder
Input Your JWT Token
Paste your JWT token into the input textarea, use the paste button to import from your clipboard, or click "Sample" to load a demo token for testing.
View Decoded Information
The tool automatically decodes the JWT header and payload, displaying them in formatted JSON. Review the algorithm, claims, and token metadata.
Verify Signature (Optional)
Enter your secret key (for HMAC) or public key (for RSA/ECDSA) to verify the token signature. Click "Verify Signature" to validate token authenticity.
Analyze Claims
Review the claims analysis section to understand token expiration, validity periods, issuer information, and custom claims included in your JWT.
Ready to Decode Your JWT Tokens?
Start using our free online JWT decoder tool now. No registration required – just paste your token and get instant results!
Start Decoding JWT →