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JWT Token Decoder

Decode and inspect JWT tokens instantly

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How to Use the JWT Token Decoder

Decode JSON Web Tokens (JWT) quickly to view header and payload information. Great for debugging authentication, inspecting claims, and understanding token structure.

Watch Demo Video

Simple 4-Step Process

1

Copy Your JWT Token

Get the JWT token from your application, API response, or authentication system. It usually starts with 'eyJ...'

2

Paste the Token

Paste your JWT token into the text area. The token should be a long string divided into three parts by dots.

3

Click Decode Button

Click the 'Decode' button to extract and show the header and payload information from your JWT token.

4

Review Decoded Data

Check the header (algorithm and token type) and payload (claims, expiration, user data) sections.

Understanding JWT Token Structure

A JWT token has three parts separated by dots (.). Each part serves a specific purpose:

Header

Contains metadata about the token

Algorithm (alg), Token Type (typ)

Payload

Contains the claims and user data

User info, Expiration (exp), Issued At (iat), Claims

Signature

Used to verify token authenticity

Not decoded - requires secret key to validate

Example JWT Token:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Common JWT Claims

JWT payloads usually include these standard claims:

iss

Issuer - Who created the token

sub

Subject - Who the token is about

aud

Audience - Who should accept the token

exp

Expiration - When the token expires

iat

Issued At - When the token was created

nbf

Not Before - When the token becomes valid

Important Security Notes

  • •This tool only decodes JWT tokens - it does not validate signatures.
  • •Never share tokens with sensitive or production data.
  • •JWTs are encoded, not encrypted - anyone can decode and read the contents.
  • •Always verify tokens on your server before trusting their contents.
  • •Check the expiration (exp) claim to ensure tokens haven't expired.

Powerful JWT Decoder & Validation Features

Decode, inspect, and validate your JSON Web Tokens instantly. View headers, payloads, and signatures clearly with real-time validation and local-only security. Perfect for developers, security engineers, and testers who need a fast and safe way to debug JWTs.

Instant token validation icon - secure and real-time JWT check

Instant Token Validation

Quickly validate JWTs and detect expired, malformed, or tampered tokens in real-time.

JWT structure icon - header, payload, signature visualization

Header, Payload & Signature View

Decode and visualize JWT sections separately. Understand algorithms, claims, and integrity instantly.

Signature verification icon - cryptographic JWT check

Signature Verification

Verify the token's signature against your secret or public key to ensure authenticity and integrity.

Security lock icon - data stays private and local

Secure & Private

All decoding happens locally in your browser. No token data ever leaves your device.

About the Developer

I build tools that make daily tasks easier for developers, writers, and digital professionals.

A Developer with a Purpose

Hi, I’m a software engineer who built this tool to tackle a real problem: finding a fast, accurate, and private way to compare text and code online without ads or signup walls.

This website was made to help users compare text documents, essays, code snippets, and configuration files in their browser. The aim is to provide a free, secure, and easy-to-use text comparison experience that works instantly for everyone.

“Every tool I create focuses on simplicity, reliability, and real-world usefulness. This project is no exception.”
Full-Stack Engineer
Open-Source Contributor
Focused Problem Solver

Who Can Benefit from This Tool?

Code Comparison

Easily compare code snippets line by line, spot changes, and ensure consistency across versions.

Quality Assurance

Find differences in documents or code and keep content accurate for professional projects.

Workflow Efficiency

Save time during editing, debugging, or reviewing documents with instant visual diffs.

Precision Analysis

Achieve character-level comparison accuracy ideal for developers, editors, and writers.

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