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🔑 JWT Decoder
Decode and inspect JWT tokens — header, payload, signature & expiry analysis
JWT TokenPaste your token
Token Claims & Expiry
⚠️ Never paste real production tokens here. This tool runs entirely in your browser — no data is sent to any server.
What is the JWT Decoder?
A JWT (JSON Web Token) is a compact, URL-safe token used for securely transmitting information between parties as a JSON object. Every modern web application that uses authentication — from Spring Boot APIs to React frontends — relies on JWTs. But reading a raw JWT token like eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9… is nearly impossible without a decoder.
Our free JWT Decoder tool instantly breaks down any JWT token into its three parts — Header, Payload, and Signature — displayed in a clear, colour-coded format. See expiry dates, issuer, subject, user roles and all claims at a glance.
Key Features
- Decodes header, payload and signature separately
- Colour-coded display for easy reading
- Shows expiry (exp), issued at (iat), issuer (iss) and subject (sub) clearly
- Works with HS256, RS256, HS512 and all common JWT algorithms
- 100% browser-based — your token never leaves your machine
- Supports Bearer tokens — paste with or without the Bearer prefix
Who Is This Tool For?
- Backend developers debugging Spring Boot or Node.js JWT authentication
- Frontend developers inspecting tokens from login APIs
- QA engineers verifying token claims and expiry in test environments
- Security engineers auditing JWT payloads for sensitive data exposure
- Students learning about OAuth2 and JWT-based authentication
Frequently Asked Questions — JWT Decoder
Q1: What is a JWT token?
A JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It consists of three parts: a Header, a Payload, and a Signature, separated by dots.
Q2: Is it safe to paste my JWT token here?
Yes. Our JWT decoder runs entirely in your browser using JavaScript. Your token is never sent to our servers, never stored, and never logged. However, avoid pasting production tokens containing sensitive user data in any public tool.
Q3: Can this tool verify a JWT signature?
Our free tool decodes the header and payload without verifying the signature. To verify a JWT signature, you need the secret key or public key used to sign it.
Q4: What algorithms does this decoder support?
Our decoder supports all common JWT algorithms including HS256, HS384, HS512, RS256, RS384, RS512, ES256 and PS256.
Q5: Why does my JWT show as expired?
The exp claim in the payload is a Unix timestamp. If the current time is past that timestamp, the token is expired. Our decoder highlights expired tokens automatically.
Q6: What is the difference between JWT and session tokens?
JWT tokens are stateless and self-contained — the server does not need to store them. Session tokens require server-side storage. JWTs are preferred for distributed microservices and REST APIs.
Try the free others tools at digitechgenai.com/tools — no signup required.
