Verify Nylas webhook signatures to trust your data

Short summary

Nylas webhooks require two verification layers to prevent forged events: an initial endpoint challenge (one-time HTTP handshake proving ownership) and per-delivery HMAC-SHA256 signature verification using a shared webhook_secret. Covers Node.js implementation, critical details like verifying the raw compressed body before framework decompression, and security best practices including constant-time comparison to prevent timing attacks.

• •Two-layer verification: endpoint challenge (one-time handshake) + per-delivery HMAC-SHA256 signature
• •Always verify the raw compressed body before decompression or parsing to avoid signature mismatches
• •Use constant-time comparison (timingSafeEqual) and guard buffer lengths to prevent timing attacks

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