API Key Generator – Create Secure API Keys Instantly
Generate secure, cryptographically random API keys for your services. Choose from UUID, alphanumeric, hex, or Base64 formats. 100% client-side, no data stored.
Click to copy the API key to your clipboard
What is API Key Generator?
An API Key Generator creates unique, high-entropy strings used to authenticate and authorize API requests. API keys serve as a simple password for server-to-server communication, allowing developers to manage access control without complex session management.
This tool generates keys using the Web Crypto API's cryptographically secure random number generator (crypto.getRandomValues), ensuring:
- High entropy - Keys are statistically impossible to guess
- Uniqueness - Each key is independently generated
- Privacy - All generation happens in your browser, nothing is sent to servers
API keys are commonly used for:
- Authenticating microservices within private networks
- Granting third-party developers access to APIs
- CI/CD pipeline authentication
- Rate limiting and usage tracking
Examples
UUID v4 format (standard)
Input:
Format: UUID v4, Prefix: noneOutput:
550e8400-e29b-41d4-a716-446655440000Prefixed API key (Stripe-style)
Input:
Format: Alphanumeric, Prefix: sk_live_Output:
sk_live_AbCdEf123456GhIjKlMnOpQrHex format (compact)
Input:
Format: Hex, Length: 32 bytesOutput:
a1b2c3d4e5f67890a1b2c3d4e5f67890Generate API Key in Node.js
const crypto = require('crypto');
// UUID v4 format
const uuid = crypto.randomUUID();
console.log('UUID:', uuid);
// Hex format (32 bytes = 64 hex characters)
const hexKey = crypto.randomBytes(32).toString('hex');
console.log('Hex:', hexKey);
// Base64 format
const base64Key = crypto.randomBytes(32).toString('base64');
console.log('Base64:', base64Key);
// With prefix (Stripe-style)
const apiKey = `sk_live_${crypto.randomBytes(24).toString('hex')}`;
console.log('API Key:', apiKey);Common Mistakes
- ✗Using predictable prefixes or patterns - Random keys should not contain guessable sequences.
- ✗Storing API keys in source code - Always use environment variables or secret managers.
- ✗Using the same key across environments - Separate keys for dev, staging, and production.
- ✗Not rotating keys periodically - Implement a key rotation strategy for production systems.
- ✗Sending keys in URLs - API keys should be in headers, not query parameters (they appear in logs).
🔐 Security Note
API keys generated here never leave your browser. For production use, store keys in secure secret management systems like AWS Secrets Manager, HashiCorp Vault, or environment variables with restricted access.
Frequently Asked Questions
What is an API key?▼
An API key is a unique identifier used to authenticate and authorize requests to an API. It acts like a password that identifies the calling application or user, enabling the API provider to track usage, apply rate limits, and revoke access if needed.
Is this API key generator secure?▼
Yes. This generator uses the Web Crypto API's cryptographically secure random number generator (crypto.getRandomValues). The keys are generated entirely in your browser and are never transmitted over the network or stored on any server.
Should I use UUID or alphanumeric API keys?▼
UUIDs are widely supported and standardized, making them a safe choice. Alphanumeric keys can be shorter and more readable. For production APIs, consider adding a prefix (like 'sk_live_') to identify the key type and environment.
How should I store API keys?▼
Never store API keys in source code or version control. Use environment variables for development, and secret management services (AWS Secrets Manager, HashiCorp Vault, etc.) for production. Apply the principle of least privilege to key access.
How often should I rotate API keys?▼
Rotate production API keys every 90 days at minimum, or immediately after any suspected compromise. Implement key rotation without downtime by supporting multiple valid keys during transition periods.