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DevMe
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JWT Generator

Generate signed JWT tokens with custom header, payload and secret key. Supports HS256, HS384 and HS512 algorithms entirely in the browser.

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What this tool does

JWT Generator creates signed JWT tokens with a custom payload and secret. It accepts a JSON header, JSON payload and a secret key and returns a signed JWT string split into header, payload and signature. Use it for testing authentication flows, mocking protected endpoints, generating tokens for integration tests and demos.

Related extensions and formats

These are the formats and values directly related to the JWT Generator workflow: a JSON header, JSON payload and a secret key becomes a signed JWT string split into header, payload and signature.

JSON Web Token

JWT

A compact token format made of encoded header, payload and signature sections, often used in authentication flows.

JSON file

.json

A structured data file based on JavaScript Object Notation, widely used for APIs, configuration files and application state.

How to use this tool

  1. 1Paste or enter a JSON header, JSON payload and a secret key into JWT Generator.
  2. 2Adjust the available options when the tool provides extra controls.
  3. 3Review a signed JWT string split into header, payload and signature, then copy or download the result.

Common use cases

  • Use a JSON header, JSON payload and a secret key for testing authentication flows, mocking protected endpoints, generating tokens for integration tests and demos.
  • Generate a signed JWT string split into header, payload and signature without installing external utilities.
  • Quickly check a JSON header, JSON payload and a secret key before pasting it into code, documentation or integrations.
  • Keep sensitive data in the browser during quick development tasks.

Frequently asked questions

What is JWT Generator used for?

It is used for testing authentication flows, mocking protected endpoints, generating tokens for integration tests and demos, converting or analyzing a JSON header, JSON payload and a secret key to produce a signed JWT string split into header, payload and signature.

What input can I use with JWT Generator?

Use a JSON header, JSON payload and a secret key. The expected result is a signed JWT string split into header, payload and signature.

Does JWT Generator send my data to the server?

No. DevMe tools are designed to process data in the browser whenever possible.