An API key is a unique identifier used to authenticate requests to an API. It's like a password that identifies your application. APIs use keys to track usage, limit access, and prevent unauthorized requests.

How secure should API keys be?

API keys should be: long (32+ characters), random (no patterns), stored securely (not in code repos), rotated periodically, and never shared publicly. Use environment variables for keys. Never commit keys to version control.

What's the difference between API key and JWT?

API keys are simple tokens identifying applications. JWTs carry claims (user info, permissions, expiration) and can be verified cryptographically. API keys for app-level access, JWTs for user-level authentication with rich metadata.

API Key Generator - Generate Secure API Keys

Key Type

Length

8-128 characters

Prefix

Common: sk_, pk_, api_

Quantity

1-50 keys

Default length: 32

Usage Tips

JWT Secret: Use at least 256 bits (32 characters) for HMAC-SHA256 signing.

API Key: Add a prefix like sk_live_ for production or sk_test_ for testing.

Security: Store keys securely. Never expose secrets in client-side code.

UUID: Use for unique identifiers. Collision probability is negligible.

What is API Key Generator?

An API key generator creates secure, random strings used for authenticating API requests, signing tokens, and identifying applications. Different use cases require different key formats: UUIDs for unique identifiers, random strings for API keys, and base64-encoded secrets for JWT signing. Strong keys use sufficient entropy to prevent guessing or collision attacks.

How to Use

Select the key type: UUID, Random String, Hex, Base64, JWT Secret, API Key, or AWS Style
Adjust length and prefix options based on your requirements
Set quantity to generate multiple keys at once
Click Generate to create secure random keys
Copy individual keys or all keys for use in your application

Why Use This Tool?

Generate cryptographically strong random keys

Multiple formats for different authentication needs

JWT secrets suitable for token signing (256-bit)

API keys with customizable prefixes

Generate multiple keys at once for batch operations

AWS-style keys for cloud service integration

Tips & Best Practices

Use 256-bit (32 character) secrets for JWT HS256 signing
Prefix API keys (sk_live_, pk_test_) to distinguish environments
Store secrets in environment variables, never in source code
Rotate keys regularly for production security
Use UUIDs when collision resistance is critical
Hex strings work well for database identifiers

Frequently Asked Questions

What's the difference between UUID and random string?

UUID v4 follows RFC 4122 format with specific version bits, making it standardized and universally unique. Random strings are simpler alphanumeric sequences without format constraints. UUIDs are ideal for database IDs and distributed systems; random strings work well for simple API keys.

How strong should my JWT secret be?

For HMAC-SHA256 (HS256), use at least 256 bits (32 bytes/characters). For HMAC-SHA512 (HS512), use 512 bits. The secret should be cryptographically random - not a password or predictable string. Weak secrets can be brute-forced, allowing token forgery.

Why use prefixes in API keys?

Prefixes like sk_live_ or pk_test_ help identify key type and environment, prevent accidental key misuse, and make keys recognizable in logs and debugging. Stripe-style prefixes (sk_, pk_) are common conventions in API design.

Are these keys secure?

Keys are generated using Math.random(), which is sufficient for development and testing. For production systems requiring cryptographic security, use keys generated with crypto.getRandomValues() or a proper cryptographic library. These generated keys should not protect highly sensitive data.

How many keys should I generate?

Generate what you need. For testing, 5-10 keys suffice. For production distribution, generate as many as your user count requires. UUIDs have negligible collision probability even at billions of keys, making them safe for high-volume generation.

What's AWS-style key format?

AWS access keys follow a specific format: 20 characters starting with AKIA (for access keys) or ASIA (for temporary credentials). This format helps identify AWS keys in logs and integrates with AWS IAM systems.

API Key Generator