JWT Generator

JWT Generator | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Security
Input types: text, select, number, textarea, checkbox
Output type: text
Sample coverage: 4
API ready: Yes

Overview

The JWT Generator is a secure utility designed to create JSON Web Tokens (JWT) for authentication and data exchange. It allows developers to define custom claims, select signing algorithms, and set token expiration times, ensuring precise control over your application's security credentials.

When to use

Testing authentication flows in your web or mobile applications.
Generating temporary access tokens for API development and debugging.
Creating secure tokens with specific claims for microservices communication.

How it works

1Enter a strong secret key to sign your token securely.
2Select your preferred HMAC algorithm (HS256, HS384, or HS512).
3Define standard claims like issuer, audience, and subject, or add custom JSON claims.
4Configure optional settings like expiration time and standard timestamps, then generate the encoded token.

Use cases

Simulating user authentication states during frontend development.
Verifying backend API endpoints that require valid Bearer tokens.
Generating short-lived tokens for secure inter-service authorization.

Examples

1. API Development Auth Token

Backend Developer

Background

A developer needs to test a protected API endpoint that requires a valid JWT with a specific user ID.

Problem

Manually constructing a signed JWT is error-prone and time-consuming.

How to use

Input a secure secret, set the subject to the user ID, and add a custom role claim.

Secret: 'my-super-secret-key', Subject: 'user_123', Custom Claims: '{"role": "admin"}'

Outcome

A fully signed JWT is generated, ready to be used in the Authorization header for API testing.

2. Token Expiration Testing

QA Engineer

Background

The QA team needs to verify that the application correctly rejects expired tokens.

Problem

Need a token that expires in exactly one minute to test the timeout logic.

How to use

Set the 'Expires In' field to 60 seconds and generate the token.

Expires In: 60, Algorithm: HS256

FAQ

Is my secret key stored on your servers?

No, this tool operates locally in your browser. Your secret key and token data are never transmitted or stored.

Which algorithms are supported?

The generator supports HMAC SHA-256 (HS256), HMAC SHA-384 (HS384), and HMAC SHA-512 (HS512).

Can I add custom data to the token?

Yes, you can include additional information in the 'Custom Claims' field using valid JSON format.

What is the purpose of the 'Expires In' field?

It sets the 'exp' claim, defining the duration in seconds after which the token will be considered invalid.

Are these tokens production-ready?

While the tokens are cryptographically valid, ensure you use a sufficiently long and complex secret key for production environments.

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Inputs

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. API Development Auth Token

2. Token Expiration Testing

FAQ

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