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Webhook Payload Linter

by Md Salman IzharOfficialGitHubWebsiteUpdated May 4, 2026

Validates webhook JSON payloads using AJV schema validation, lints request context for errors, and verifies HMAC signatures for Stripe and Shopify. This stateless server processes requests at zero API cost. Developers handling payment webhooks use it to ensure data integrity before application logic.

webhooks
validation
hmac
+2
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Overview

The Webhook Payload Linter MCP server provides validation for incoming webhook payloads, focusing on JSON schema checking with AJV, request context linting, and HMAC signature verification for Stripe and Shopify. It operates statelessly with no API costs, making it suitable for high-volume webhook processing in production environments.

Key Capabilities

  • JSON Validation (AJV): Checks webhook payloads against predefined JSON schemas to catch structural errors early.
  • Request Context Linting: Inspects headers, methods, and metadata for common issues like missing fields or malformed data.
  • Stripe HMAC Verification: Computes and matches HMAC signatures using Stripe's secret to confirm payload authenticity.
  • Shopify HMAC Verification: Validates Shopify webhook signatures with the shared secret, preventing tampered requests.

All functions run independently without state, returning validation results or errors immediately.

Use Cases

  1. Stripe Payment Webhook Handler: In a Node.js app, pipe incoming Stripe webhooks to the linter to verify HMAC and validate charge.succeeded event JSON before updating a database.
  2. Shopify Order Notifications: For a Python Flask endpoint, use the linter to check orders/create payload HMAC and schema, then sync inventory only on valid requests.
  3. Multi-Provider Dashboard: Lint mixed Stripe and Shopify webhooks in a dashboard app, rejecting invalid requests to avoid processing bogus data.
  4. CI/CD Testing: During development, simulate webhooks and lint them to ensure schemas match provider specs before deployment.

Who This Is For

Backend developers building webhook endpoints for e-commerce or payment systems, especially those integrating Stripe or Shopify. DevOps teams automating validation in serverless functions (e.g., AWS Lambda, Vercel) or microservices benefit from its zero-cost, stateless design. Suitable for any stack needing reliable webhook security without custom validation code.