HMAC Generator API — Generate HMAC-SHA256 Message Authentication Codes
Generate HMAC-SHA256 message authentication codes. Secure API request signing and message verification. Free API.
What is HMAC?
Hash-based Message Authentication Code (HMAC) is a mechanism for message authentication using cryptographic hash functions combined with a secret key. HMAC-SHA256 is widely used for API request signing, JWT token verification, and webhook payload verification.
How to Use It
Call GET /api/v1/hmac-generator?text=test&key=secret. Returns { algorithm: string, hmac: string, hex: string, base64: string }.
Try it live
Test this endpoint in the interactive console
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Frequently Asked Questions
What key sizes are recommended?
For HMAC-SHA256, a key of at least 32 bytes (256 bits) is recommended for security.