TypeScript Contract-Driven Webhooks: Replayable, Signed, and Versioned by Design
backend-engineering•Jan 8, 2026

TypeScript Contract-Driven Webhooks: Replayable, Signed, and Versioned by Design

Treat webhooks like an API product with a real spec, using TypeScript to create contract-driven events that are typed, validated, versioned, signed, and replayable from day one.

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Key summary

This article proposes a stronger approach to building contract-driven webhooks in TypeScript, focusing on typed schemas, HMAC signatures, idempotent delivery, replay endpoints, and versioned events to ensure reliability and maintainability.

TL;DR

  • Treat webhooks like an API product with a real spec
  • Use TypeScript for contract-driven events
  • Implement typed schemas for event data
  • Use HMAC signatures for event authentication
  • Ensure idempotent delivery of events
  • Create replay endpoints for event recovery
  • Version events to prevent breaking changes

This content is automatically summarized using AI. For full context, always refer to the original article.

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