BrowserTools

JWT Decoder

Inspect JWT header, payload and expiry

100% Private & In-Browser

Processed locally using client-side JavaScript. Your files and data never touch any server.

Instant & Unlimited

No registration, no waiting queues, and no limits on file conversions or generations.

Tool Overview & Guide

What is JWT Decoder?

The JWT Decoder parses and inspects JSON Web Tokens (JWT) without exposing sensitive tokens to remote servers. It unpacks the standard three-part token structure (Header, Payload, and Signature), formats Unix expiration timestamps into readable dates, and highlights token expiration status in real time.

Step-by-Step Instructions

How to use JWT Decoder

1

Paste your encoded JSON Web Token (eyJ...) into the input field.

2

The browser splits the token on dot (.) delimiters into Header, Payload, and Signature components.

3

Base64URL decoding reconstructs the underlying JSON objects with complete UTF-8 character support.

4

Inspect token claims (sub, iss, exp, iat, aud) with color-coded syntax formatting.

Key Capabilities
  • Client-side Base64URL decoding with zero external network requests
  • Automatic parsing of standard JWT claims (exp, iat, nbf, iss, sub)
  • Visual indicator for expired vs active token status
  • Preserves complete confidentiality for sensitive enterprise tokens
Common Use Cases
  • Debugging OAuth 2.0 and OpenID Connect (OIDC) authentication flows in web and mobile applications.
  • Checking token expiration timestamps (exp) and issued-at times (iat) during development.
  • Verifying payload scopes, roles, and user claims before sending requests to protected APIs.
Clear Answers

Frequently Asked Questions

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