---
title: "JWT Decoder — Documentation & FAQ"
description: "How to use JWT Decoder, plus answers to common questions."
canonical: "https://www.razi.pro/tools/jwt-decoder/docs"
tags: ["jwt decoder", "jwt viewer", "decode jwt token"]
source: "razi.pro"
---

# JWT Decoder — Documentation & FAQ

Documentation for [JWT Decoder](https://www.razi.pro/tools/jwt-decoder) — Decode JSON Web Tokens instantly and inspect headers, payloads, and signatures.

## Quick start

Paste a JWT token to instantly decode and view the header, payload, and signature.

## Tips

- Everything runs in your browser — your token is never sent to any server.

## Frequently asked questions

### How do I decode a JWT token?

Paste your JWT (JSON Web Token) into the input field and the tool will instantly decode and display the header, payload, and signature. No server-side processing — everything runs in your browser.

### Is it safe to paste my JWT here?

Yes. The JWT decoder runs entirely in your browser. Your token is never sent to any server. However, avoid sharing JWTs publicly as they may contain sensitive claims.

### What information is in a JWT token?

A JWT contains three parts: the Header (algorithm and token type), the Payload (claims like user ID, expiration time, and roles), and the Signature (verification hash). Our tool decodes and displays all three parts.

### Can I verify a JWT signature with this tool?

The tool decodes and displays the signature but does not verify it, as verification requires the secret key or public key used to sign the token.