API Keys and Webhook Security β Best Practices
API keys and webhooks are the backbone of modern integrations. Whether you're connecting to Stripe, GitHub, or building your own API, understanding how to generate, store, and verify credentials is essential for security.
1. Generating API Keys
API keys should be cryptographically random. Avoid predictable patterns or sequential IDs. Common formats include:
- Hex: 32 or 64 character strings for internal systems.
- Base64 (URL-safe): Compact encoding for tokens and JWTs.
- Bearer / sk_ prefix: Used by OpenAI, Stripe, and many SaaS platforms.
Use our free API Key Generator to create keys in various formats β all processing happens in your browser, so keys never leave your device.
2. Storing API Keys Safely
Never commit API keys to version control. Use environment variables, secret managers (AWS Secrets Manager, HashiCorp Vault), or platform-specific solutions like Vercel Environment Variables.
Rotate keys periodically and revoke compromised keys immediately. For production, prefer short-lived tokens (OAuth) over long-lived API keys when possible.
3. Webhook Signature Verification
Webhooks from GitHub, Stripe, Slack, and similar services include an HMAC signature in the request header (e.g., X-Hub-Signature-256). This proves the payload was not tampered with and originated from the expected service.
Always verify the signature before processing a webhook. Use the raw request body (not parsed JSON) when computing the HMAC, as parsing can alter the payload.
Try our free Webhook Tester to verify HMAC-SHA256 signatures locally and generate curl commands for testing your endpoints.
4. Conclusion
API keys and webhooks require careful handling. Generate keys with cryptographically secure randomness, store them in secret managers, and always verify webhook signatures before processing. These practices protect your application and your users' data.