JWT Generator

JWT Generator is a free online tool that create JSON Web Tokens with custom claims, algorithms, and expiration. Generate HS256/HS384/HS512 tokens instantly. Process data securely in your browser with no information transmitted to external servers.

JWT Generator workspace and controls

Standard Claims

Custom Claims

No custom claims added yet

What is JWT Generator | Rune

JWT Generator creates signed JSON Web Tokens with customizable headers, standard claims, and custom claims. Choose from HMAC algorithms (HS256, HS384, HS512), set expiration time, issuer, subject, audience, and add typed claims.

Ideal for developers building authentication flows, testing APIs, or learning about JWT structure. Token generation uses the Web Crypto API and runs in your browser.

3
Algorithms
HMAC
Signing
Custom
Claims
Instant
Generation

Why Choose JWT Generator on Rune

JWT Generator brings together 6 capabilities, including multiple algorithms, standard claims, and custom claims, in a single browser-based workspace. JWT Generator handles routine input directly in your browser when the workflow does not need sharing, sync, remote lookup, or external conversion. Open the page, finish the task, and copy or download the result without installing software.

Rune built JWT Generator for anyone who values getting things done over navigating menus and settings. Set issuer (iss), subject (sub), audience (aud), and expiration time with intuitive form fields. It is the kind of tool you bookmark once and reach for whenever the need comes up.

Key Features of JWT Generator

Multiple Algorithms, Standard Claims, and 4 more reasons to use JWT Generator

Multiple Algorithms

Generate tokens signed with HS256, HS384, or HS512 using HMAC with your secret key.

Standard Claims

Set issuer (iss), subject (sub), audience (aud), and expiration time with intuitive form fields.

Custom Claims

Add custom claims with string, number, or boolean value types for testing token payloads.

Expiration Control

Set token expiration in minutes. Generated tokens include iat (issued at) automatically.

One-Click Copy

Copy the generated JWT token to clipboard instantly for use in your API requests.

Client-Side Security

Token generation uses the Web Crypto API. Your secret key never leaves your browser.

Key Advantages of JWT Generator

No installation required

JWT Generator opens in your browser. There is nothing to download or configure before you start the core workflow.

Multiple Algorithms

Generate tokens signed with HS256, HS384, or HS512 using HMAC with your secret key. This feature is available for free with no usage limits on the standard tier.

Browser-based processing

JWT Generator handles local input in your browser, so routine work stays on your device without extra setup.

Mobile and desktop ready

JWT Generator works on any screen size. The interface adapts to phones, tablets, and desktops so you can use it wherever you are.

No account needed for core use

Use the core JWT Generator workflow without creating an account or providing an email address.

Free with no hidden costs

JWT Generator is completely free on the standard tier. There are no trial periods, no watermarks on output, and no surprise paywalls after you start using it.

Who Benefits from JWT Generator

JWT Generator fits into a wide range of workflows. Here is how different users put it to work.

Students and Academics
Use JWT Generator for assignments, research papers, and coursework. Generate tokens signed with HS256, HS384, or HS512 using HMAC with your secret key.
Professionals and Teams
Integrate JWT Generator into your daily workflow for faster turnaround on routine tasks. Set issuer (iss), subject (sub), audience (aud), and expiration time with intuitive form fields.
Content Creators and Freelancers
Speed up your creative process with JWT Generator. Add custom claims with string, number, or boolean value types for testing token payloads.
Developers and Technical Users
Add JWT Generator to your toolkit for quick utility tasks between coding sessions. Set token expiration in minutes. Generated tokens include iat (issued at) automatically.

How to Use JWT Generator

Getting started with JWT Generator takes under a minute

01

Configure Claims

Choose algorithm, enter secret key, set standard claims and add custom claims as needed.

02

Generate Token

Click generate to create a signed JWT using HMAC with your selected algorithm.

03

Copy & Use

Copy the generated token and use it in your API authorization headers or testing.

Rune pro tipsPro Tips

  • Use a strong, random secret key (at least 32 characters) for HS256 in production environments.
  • Set short expiration times (15-60 minutes) for access tokens and longer for refresh tokens.
  • Always include 'iss' and 'aud' claims to restrict token usage to specific services.
  • Test your JWT by pasting it into the JWT Decoder tool to verify the claims are correct.

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Frequently Asked Questions

Have questions? Here are the answers about JWT Generator

What algorithms does this JWT generator support?

Currently supports HMAC algorithms: HS256 (SHA-256), HS384 (SHA-384), and HS512 (SHA-512). These are the most common symmetric signing algorithms for JWT.

Should I use generated JWTs in production?

Use this tool for testing and learning. Production tokens should be issued by your trusted auth server with proper key management, expiration, rotation, and audit controls.

Is my secret key uploaded?

Token signing runs in your browser. Avoid pasting production secrets into web tools unless you understand the risk.

What is the difference between HS256, HS384, and HS512?

They all use HMAC signing but with different SHA hash sizes: SHA-256 (256-bit), SHA-384 (384-bit), and SHA-512 (512-bit). Larger hashes provide stronger signatures.

Can I add custom claims?

Yes, custom claims are added to the payload alongside standard claims. Avoid adding sensitive data to JWT payloads because payloads are readable by anyone with the token.

What is the 'iat' claim?

The 'iat' (issued at) claim records when the token was created as a Unix timestamp. It is automatically included in every generated token.

Why should JWT payloads avoid secrets?

JWT payloads are Base64URL encoded, not encrypted. Anyone who has the token can decode and read the claims.

How do I verify the generated token?

Use the JWT Decoder tool to decode and inspect the token, or verify it programmatically on your server with the same secret key.

Still need help?

Can't find what you're looking for? Our support team is here to assist you.

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