Can a JWT contain private data?

Yes. JWT payloads are readable by anyone who has the token unless the token is encrypted, so avoid storing secrets in standard JWT payloads.

What claims should I check first?

Start with exp, iat, iss, aud, sub, scopes, roles, and any tenant or organization identifiers your app depends on.

JWT

Security & Privacy / Browser Local

JWT Decoder

Decode JWT headers and payloads locally so tokens, claims and expiry dates are easy to inspect.

Security & PrivacyRuns in browserNo signup

How to use

Paste your input, click the primary action, and copy the result. Everything runs locally in your browser.

Example: Paste a JWT token...

InputOutputread only

About JWT Decoder

A JWT decoder is useful when you need to inspect authentication tokens without sending them to a third-party website. JSON Web Tokens usually contain a header, payload, and signature. The header explains the algorithm and token type, while the payload often includes claims such as subject, issuer, audience, expiration time, roles, scopes, or tenant identifiers.

This tool decodes the readable header and payload sections locally in your browser. It is built for debugging login flows, API authorization, expired sessions, OAuth integrations, and backend middleware. Decoding a JWT does not verify the signature or prove the token is trusted; it only makes the embedded JSON readable so you can understand what the token says.

Use it when checking whether exp, iat, aud, or role claims match what your application expects. Because tokens can contain sensitive account data, browser-side decoding is especially important.

JWT Decoder Knowledge Base

What It Is Used For

Decode JWT headers and payloads locally so tokens, claims and expiry dates are easy to inspect. People usually use this tool when they need fast, repeatable output without opening a heavy desktop app or sharing private data with a third-party service.

How To Use It

Paste your input, adjust the visible options, run the action, then copy or download the result. For keyboard-heavy workflows, supported tools also respond to Ctrl+Enter or Cmd+Enter.

Search Topics Covered

jwt decoder online, decode jwt token, json web token decoder, jwt payload viewer, jwt claims inspector, jwt decoder. This page is written to answer those common search intents with practical browser-based examples and privacy-first processing.