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Guide

How to use this tool, examples, and related tips.

How to Use the JWT Decoder

Paste your JWT — the full xxxxx.yyyyy.zzzzz string — into the input field.

The tool splits the token into its three parts, Base64URL-decodes the header and payload, and displays them as formatted JSON.

Inspect the claims, expiry, issuer, and any other fields in the payload.

What Is a JWT?

A JSON Web Token (JWT) is a compact, URL-safe token format defined in RFC 7519, used to transmit claims between parties. A JWT consists of three Base64URL-encoded parts separated by dots: a header (specifying the algorithm), a payload (containing the claims), and a signature. The header and payload are plain JSON — only the signature is cryptographic. JWTs are widely used in authentication systems, OAuth 2.0 flows, and API authorization, typically passed as a Bearer token in the Authorization header.

When to Use This Tool

Debugging authentication flows — Inspect the claims in a JWT to verify the issuer, subject, expiry time, and custom claims without writing decode logic.

Checking token expiry — Decode the exp claim to confirm whether a token has expired or is still valid.

Understanding third-party tokens — Decode JWTs from OAuth providers, identity platforms, or APIs to understand their structure and claims.

Development and testing — Quickly inspect tokens during local development without needing a library or debugger.

Related Tools

  • Base64 decoder
  • JSON formatter & validator
  • HMAC generator
  • Base64 encode / decode
  • JSON validator

FAQ

Answers about this tool and how your data is handled.

Does this tool verify the JWT signature?

No. This tool decodes the header and payload only — it does not verify the signature against a secret or public key. Never trust the claims in a JWT without signature verification in your application code.

Is it safe to paste a JWT into this tool?

The tool runs entirely in your browser — nothing is sent to a server. That said, treat production JWTs as sensitive credentials. Avoid pasting live tokens from production systems into any online tool when possible.

What is Base64URL encoding?

Base64URL is a variant of Base64 that replaces + with - and / with _, and omits padding, making it safe for use in URLs and HTTP headers. JWTs use Base64URL for the header and payload segments.

Can I use this to decode any Base64URL string?

This tool is specifically designed for the three-part JWT format. For general Base64 decoding, use the Base64 decoder.

What claims should I look for in a JWT payload?

Common registered claims include sub (subject), iss (issuer), exp (expiration time), iat (issued at), and aud (audience). Custom claims vary by application.

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