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jwt-config-generator skill

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This skill generates a complete JWT authentication configuration and utilities in TypeScript, enabling secure token signing, verification, and refreshing for

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SKILL.md

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---
name: jwt-config-generator
description: Generate JWT authentication configuration and utilities for API security. Triggers on "create jwt config", "generate jwt authentication", "jwt setup", "token auth config".
---

# JWT Config Generator

Generate JWT authentication configuration and utility functions.

## Output Requirements

**File Output:** `jwt.ts` with sign/verify utilities
**Format:** Valid TypeScript
**Standards:** JWT best practices, jsonwebtoken library

## When Invoked

Immediately generate a complete JWT configuration with token utilities.

## Example Invocations

**Prompt:** "Create JWT authentication config"
**Output:** Complete JWT utilities with sign, verify, and refresh logic.

Overview

This skill generates a complete JWT authentication configuration and utility file in TypeScript. It outputs a ready-to-use jwt.ts containing sign, verify, and refresh token logic following JWT best practices. The utilities target the jsonwebtoken library and include sensible defaults for expiration, algorithms, and key handling.

How this skill works

When triggered, the skill produces a TypeScript module that exports functions to create access and refresh tokens, verify tokens, and decode payloads safely. The generated code uses jsonwebtoken for signing and verification, supports environment-based secret or key selection, and includes error handling and token rotation guidance. It follows common patterns for token lifetimes, algorithms, and secure storage recommendations.

When to use it

Bootstrapping JWT auth for a new API service
Adding standardized token utilities across microservices
Generating consistent sign/verify/refresh logic for TypeScript projects
Creating a secure starting point for sessionless authentication
Rapidly producing example code for security reviews or onboarding

Best practices

Store secrets and private keys in environment variables or a secrets manager, never in source control
Prefer asymmetric algorithms (RS256) when you need key rotation and cross-service verification
Keep access tokens short-lived and refresh tokens long-lived with strict revocation controls
Validate token issuer (iss), audience (aud), and issued-at/expiration claims (iat, exp) on every request
Log verification failures and monitor unusual token activity for potential abuse

Example use cases

Create jwt.ts for an Express API that issues access and refresh tokens
Generate utilities to integrate JWT-based auth with GraphQL resolvers
Produce sign/verify helpers for serverless functions that validate incoming tokens
Provide sample refresh token rotation flow for a mobile app backend

FAQ

Which library does the generated code use?

The output uses the jsonwebtoken library for signing and verification in TypeScript.

Does it support symmetric and asymmetric keys?

Yes. The template supports both HS256 (shared secret) and RS256 (private/public keys) via environment configuration.