🔒 Your data stays in your browser. Never share tokens containing sensitive secrets.

Decode JWT Payloads | JSON Web Token Viewer

Instantly decode JSON Web Tokens (JWT) to inspect headers and claims. This tool provides a fast, client-side way to view token contents without requiring signature verification—perfect for debugging authentication flows.

💡 Why Use This?

Stop guessing what’s inside your Base64 strings. Use this viewer to: - Verify Claims: Check user roles, permissions, or custom metadata. - Troubleshoot Expiry: Instantly see if a token has expired or if the iat (issued at) time is correct. - Inspect Headers: Confirm the algorithm (alg) and token type (typ) match your server configuration.

📘 Features

  • Instant Decoding: Paste any header.payload.signature token to see the formatted JSON immediately.
  • Human-Readable Timestamps: Automatically converts Unix timestamps like exp, iat, and nbf into your local date and time. 🗓️
  • Pretty Print: Automatically indents and color-codes JSON for better readability. ⚡
  • Privacy First: All processing happens locally in your browser. Your tokens are never sent to a server, keeping your sensitive data private. 🛡️

🧐 Frequently Asked Questions

  • Does this tool verify signatures?
  • No. This is a viewer, not a validator. It displays the content regardless of whether the signature is valid. For security testing, use a tool that supports secret/public key verification.
  • Is it safe for production tokens?
  • Yes. Because the decoding logic runs entirely on the client side, your data stays in your browser. However, always exercise caution when handling production tokens in any web-based environment.
  • Why is my token not decoding?
  • Ensure the token follows the standard format of three Base64Url strings separated by periods (.). Note: This tool does not support encrypted tokens (JWE).

⚠️ Security Reminder

In the industry, "JWT" is often pronounced like the word "jot."

Remember: standard JWTs are signed, not encrypted. This means anyone with the token can read its contents using a tool like this. The signature only proves the data hasn't been tampered with. Never store sensitive information like passwords, API keys, or credit card numbers in a JWT payload.