Three Ways to Test SendGrid Webhooks on Your Local Machine

Testing SendGrid webhooks locally is difficult because the platform cannot reach a localhost endpoint directly from the internet. Developers typically resort to tools like ngrok, which create temporary tunnels but generate new URLs on every restart. A more stable alternative involves using a relay service such as Anonymily, which provides a persistent public endpoint that forwards webhook payloads to localhost via Server-Sent Events. Regardless of the method, developers must validate each incoming webhook by verifying its HMAC-SHA256 signature using the x-twilio-email-signature and x-twilio-email-timestamp headers sent by SendGrid. The article outlines three production-ready approaches to help developers inspect and replay webhook payloads without pushing code to a staging environment.