JWT Decoder
DeveloperDecode a JWT token into its header, payload and signature as readable JSON. Fully client-side; your token never leaves your browser.
What is a JWT?
A JWT (JSON Web Token) is a compact, URL-safe token that carries claims between two parties, used in authentication and authorization flows such as login sessions and API access. It consists of three base64url-encoded parts separated by dots.
What is inside a JWT?
- Header: the token type and signing algorithm, e.g. alg: HS256.
- Payload: the claims, e.g. sub, exp and other custom data.
- Signature: verifies the token was not tampered with.
Is my data safe?
Yes. Decoding happens entirely in your browser; the token is never sent to any server. Note that decoding does not verify the signature — a JWT is readable by everyone who receives it.
Frequently Asked Questions
What is JWT Decoder?
Decodes a JWT into its header, payload and signature, shown as readable JSON.
How do I use JWT Decoder?
Type or paste your data into the field on this page and press the button. The result is calculated instantly in your browser — nothing is uploaded.
Is JWT Decoder free?
Yes, JWT Decoder is completely free. No signup, no downloads and no usage limits.
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