JWT decode

JWT Decode tool

Header

Payload

JWT Decode & Encode - Free Online JWT Encoder and Decoder Tool

Welcome to jwtdecode.pro – the all-in-one platform for developers, security professionals, and learners who work with JWTs. Our free online tool allows you to quickly and securely perform both jwt decode and jwt encode operations directly in your browser. Whether you're inspecting an existing JWT token or generating a new one, our jwt decoder and encoder make the process fast, simple, and secure.

What is JWT and Why Decode It?

JSON Web Token (JWT) is a proposed Internet standard for creating data wit optional signature and/or optional encryption whose payload holds JSON that asserts some number of claims. The tokens are signed either using a private secret or a public/private key.

A standard JWT consists of three parts: jwt_png

  1. Header

Identifies which algorithm is used to generate the signature.

In the below example, HS256 indicates that this token is signed using HMAC-SHA256.

example:

{
  "alg": "HS256",
  "typ": "JWT"
}
  1. Payload

Contains the actual data (called "claims") being transferred. This can include predefined claims like iss (issuer), exp (expiration), sub (subject), etc., as well as custom claims. example:

{
  "loggedInAs": "admin",
  "iat": 1422779638
}
  1. Signature

Used to verify that the token hasn’t been altered. It is created by taking the encoded header and payload, combining them with a secret key, and signing them using the specified algorithm.

The three parts are encoded separately using Base64url Encoding RFC, and concatenated using periods to produce the JWT.

Full Example:

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJsb2dnZWRJbkFzIjoiYWRtaW4iLCJpYXQiOjE0MjI3Nzk2Mzh9.gzSraSYS8EXBxLN _oWnFSRgCzcmJmMjLiuyu5CSpyHI=

Why Use jwtdecode.pro?

At jwtdecode.pro, we offer a powerful, secure, and easy-to-use platform for both jwt decode and jwt encode tasks. Whether you’re debugging tokens or creating new ones, our tool is built to help.

Key Features

  • 🔐 100% Secure: All operations are performed client-side. Your JWT tokens never leave your browser.
  • ⚡ Lightning Fast: Real-time jwt decode and jwt encode results.
  • 🌐 Fully Online: No installation or sign-up required.
  • 🧩 Supports All JWT Algorithms: HS256, RS256, and more.
  • 🔄 Bi-directional Support: Decode existing JWTs or encode new ones with custom headers and payloads.

JWT Decode - Easily Inspect JWT Tokens

Our jwt decode online tool allows you to paste in any JWT token and instantly view its decoded header and payload. This is especially useful for:

  • Debugging authentication flows
  • Verifying claims such as exp, iat, and aud
  • Understanding third-party tokens
  • Learning how JWTs are structured

The jwt decoder breaks down the token in a clean, readable format, helping you analyze the data with ease.

JWT Encode - Generate JWT Tokens Instantly

Need to create a JWT token? Our jwt encode tool lets you build a token from scratch. Just enter your desired header and payload, choose a signing algorithm, and (optionally) provide a secret or private key. The result is a valid JWT token you can use for testing, development, or learning.

Use our jwt encoder to:

  • Generate test tokens for your app
  • Simulate different claim scenarios
  • Learn how headers and payloads affect the final token
  • Create tokens signed with HS256, RS256, and other algorithms

How to Use Our JWT Decoder

Using our jwt decode and jwt encode tool is simple:

Decode:

  1. Copy your JWT token.
  2. Paste it into the input field on our website.
  3. Press Decode button, instantly view the decoded header and payload.

Encode:

  1. Copy your Header and Payload Data
  2. Paste it into the input field on our website.
  3. Paste your secret key into the input field
  4. Press Encode button, instantly view the jwt.

Our jwt decoder breaks down each part of the token into a human-readable format, making it easier to analyze and debug.

Key Features of Our JWT Decode Online Tool

  • Supports all standard JWT algorithms like HS256, RS256, and more.
  • Highlights token expiration (exp), issued at (iat), and other claims.
  • Works with access tokens, ID tokens, and custom JWTs.
  • No sign-up or login required.

Whether you’re performing a jwt token decode for debugging or verifying claims, our jwt decode online tool simplifies the process.

Use Cases for JWT Decode

  • 🔧 Debugging token-related errors in web apps
  • 🔍 Verifying user claims during development
  • 📚 Learning how JWTs work
  • 🛡️ Inspecting third-party tokens for security audits

Our jwt decoder is built for all these use cases and more.

Security and Privacy

Your security is our priority. All jwt decode and jwt encode actions are executed entirely in your browser. We do not store, transmit, or log any JWT tokens or data you enter.

Please note: Decoding a JWT does not verify its signature. For full validation, you must verify the signature using the correct secret or public key.

Frequently Asked Questions

Is jwtdecode.pro safe to use?

Yes. All jwt decode and jwt encode operations are processed locally in your browser. Your data is never sent to our servers.

What algorithms are supported?

We support all commonly used JWT algorithms, including:

  • HS256 (HMAC with SHA-256)
  • RS256 (RSA Signature with SHA-256)
  • ES256 (ECDSA with SHA-256)

Can I decode encrypted JWTs?

Our jwt decoder supports standard signed JWTs (JWS). Encrypted JWTs (JWE) must be decrypted before decoding.

Start Using JWT Decode & Encode Now

Stop wasting time with complicated libraries or untrusted tools. Use jwtdecode.pro to decode and encode JWT tokens online—quickly, securely, and for free.

Whether you're analyzing a token or building one from scratch, our jwt decode and jwt encode tool is the fastest and safest solution available.

Paste your token to decode it, or create a new one with our encoder. Try it now!

jwtdecode.pro – The ultimate jwt decode and jwt encode tool for developers, analysts, and learners.