JWT Decoder (Header & Payload Inspector)

Decode Base64URL-encoded JSON Web Tokens into formatted JSON header and payload claims locally in your browser.

How It Works & Processing Standards

Decode Base64URL-encoded JSON Web Tokens into formatted JSON header and payload claims locally in your browser.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 100,000 characters

JWT Decoder (Header & Payload Inspector) is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use JWT Decoder (Header & Payload Inspector)

  1. 1
    Paste TokenPaste your raw encoded JWT string (header.payload.signature).
  2. 2
    Inspect JSON ClaimsReview formatted header and payload objects with syntax highlighting.

Common Use Cases

  • Debugging OAuth2 / OpenID Connect authentication flows and inspecting user permissions in auth tokens
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