What information is in a JWT payload?

JWT payload contains claims — sub (subject/user ID), iat (issued at), exp (expiry time), email, roles, and any custom data the server included when generating the token.

JWT Decoder Online Free — Decode JSON Web Token Instantly

🔑 JWT Decoder Online Free

Paste any JSON Web Token and instantly decode header, payload and signature. No signup, no server upload — 100% browser-based.

🔑 Paste JWT Token

HEADER

PAYLOAD

SIGNATURE

JWT Decoder Online Free — Decode JSON Web Tokens Instantly

Our free online JWT decoder lets you paste any JSON Web Token and instantly see the decoded header, payload, and signature in readable JSON format. Works entirely in your browser — your token is never sent to any server.

What is a JWT Token?

JWT (JSON Web Token) is a compact, URL-safe token format widely used for authentication and authorization in web applications and APIs. A JWT consists of three Base64URL-encoded parts separated by dots:

Header — algorithm type (HS256, RS256 etc) and token type
Payload — claims: user ID, email, roles, expiry time, issued-at time
Signature — cryptographic signature to verify authenticity

How to Decode a JWT Token — Step by Step

Step 1: Copy your JWT token (starts with eyJ...)
Step 2: Paste it into the input box above
Step 3: Click Decode JWT Token
Step 4: See Header, Payload, and Signature in readable JSON
Step 5: Copy any section with the Copy button

Common JWT Claims

sub — Subject (user ID)
iat — Issued At (timestamp when token was created)
exp — Expiry (timestamp when token expires)
aud — Audience (intended recipient)
iss — Issuer (who created the token)
email, name, roles — Custom application claims

Is JWT Decoding Safe?

JWT decoding simply reads the Base64URL-encoded data — it does not verify the signature. Our tool runs 100% in your browser — your token never leaves your device. However, never paste production JWT tokens into any online tool if they contain sensitive user data.

JWT vs Session Token

Unlike session tokens stored server-side, JWTs are self-contained — all user information is encoded in the token itself. This makes them ideal for stateless APIs, microservices, and single-page applications (SPAs).

How to Use the JWT Decoder

Paste your JWT token into the input box
Click Decode JWT
View the decoded header and payload as readable JSON
Click Copy to copy the decoded data

Frequently Asked Questions — JWT Decoder

How do I decode a JWT token online for free?

Paste your JWT token into the input box, click Decode JWT Token, and instantly see header, payload, and signature in readable JSON. No signup, free.

Is it safe to decode JWT tokens online?

Our tool works 100% in your browser — your token is never sent to any server. All decoding happens locally using JavaScript.

What is a JWT token?

JWT (JSON Web Token) is a compact token format used for authentication. It has three parts: header (algorithm), payload (user data/claims), and signature — separated by dots.

Can I verify JWT signature with this tool?

This tool decodes and reads header and payload. Signature verification requires the secret key — which should never be shared publicly.

What does exp claim mean in JWT?

exp is the expiry timestamp — a Unix timestamp showing when the token expires. Our decoder shows if your token is expired or still valid.