JWK Generator & Parser

JWK Generator & Parser | 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: select, text, checkbox, textarea
Output type: html
Sample coverage: 4
API ready: Yes

Overview

The JWK Generator & Parser is a utility for creating and inspecting JSON Web Keys (JWK). It supports generating keys for RSA, Elliptic Curve (EC) curves like P-256, P-384, P-521, and secp256k1, as well as Octet Key Pair (OKP) curves including Ed25519, Ed448, X25519, and X448. Additionally, it allows you to parse existing JWK strings to inspect their cryptographic parameters, key thumbprints, and metadata.

When to use

When you need to generate a new public/private key pair formatted as a JSON Web Key (JWK) for JWT signing or encryption.
When you need to extract the public key component from an existing private JWK to share with external clients.
When you need to parse and inspect the parameters, key ID (kid), or thumbprint of an existing JWK string.

How it works

1Select the mode: choose 'Generate' to create a new key, or 'Parse' to inspect an existing JWK.
2For generation, select the key type (RSA, EC, or OKP), configure the key size or curve, optionally assign a custom Key ID (kid), and choose whether to export only the public key.
3For parsing, paste your JWK JSON string into the input area to decode its properties.
4View the generated or parsed JWK output, including its cryptographic parameters and metadata.

Use cases

Generating a new Ed25519 OKP key pair for signing JSON Web Tokens (JWT) in a modern web application.
Extracting a public-only JWK from a full RSA key pair to publish on a JWKS (JSON Web Key Set) endpoint.
Debugging an invalid JWK string by parsing it to verify its structure, curve parameters, and key ID.

Examples

1. Generate an EC P-256 Key Pair for JWT Signing

Backend Developer

Background

A developer needs to configure an OAuth2 authorization server that signs tokens using Elliptic Curve cryptography.

Problem

They need a valid P-256 EC key pair formatted as a JWK with a specific Key ID.

How to use

Set Mode to 'Generate', Key Type to 'EC', Curve to 'P-256', and enter 'auth-key-v1' in the Key ID field. Leave 'Public Only' unchecked to get both public and private parameters.

Mode: Generate, Key Type: EC, Curve: P-256, Key ID: auth-key-v1, Public Only: false

Outcome

A JSON object containing the private and public parameters (kty, crv, x, y, d, kid) ready for use in the server configuration.

2. Parse and Inspect an Existing RSA JWK

Security Engineer

Background

An engineer is troubleshooting a token verification failure and needs to verify the parameters of a public key.

Problem

They have a raw JWK string and need to check its key type, modulus, and exponent.

How to use

Set Mode to 'Parse' and paste the JWK JSON string into the 'JWK to Parse' text area.

FAQ

What key types can I generate?

You can generate RSA, EC (P-256, P-384, P-521, secp256k1), and OKP (Ed25519, Ed448, X25519, X448) keys.

Can I generate a public-only JWK?

Yes, check the 'Public Only' option to exclude private key parameters from the generated output.

What is the 'kid' parameter?

The 'kid' (Key ID) is an optional identifier used to match a specific key in a set of JSON Web Keys.

How do I inspect an existing JWK?

Switch the mode to 'Parse', paste your JWK JSON string into the input field, and view the decoded parameters.

Are my private keys secure when using this tool?

Yes, all key generation and parsing operations run locally in your browser without transmitting key data to any server.

Mode: Parse, JWK to Parse: {"kty":"RSA","n":"u1W2...","e":"AQAB","kid":"key-2"}

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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. Generate an EC P-256 Key Pair for JWT Signing

2. Parse and Inspect an Existing RSA JWK

FAQ

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