AWS Lambda

How to integrate AWS Lambda with Webflow

Connect AWS Lambda to Webflow through automation platforms (Zapier, Make, n8n) for visual workflow building, Lambda Function URLs for simple endpoints, or API Gateway for production sites requiring custom domains.

Use automation platforms

Zapier, Make, and n8n connect Webflow triggers (form submissions, CMS changes, e-commerce events) to Lambda function invocations without code.

Zapier offers a pre-built template connecting Webflow form submissions to Lambda function invocations with automatic retry on failures.

Make provides visual scenario building with conditional branching and parallel processing for complex workflows.

n8n offers open-source workflow automation with self-hosting options.

These platforms handle webhook subscriptions, authentication, retry logic, and data transformation automatically. Best for teams without backend development expertise or when business-critical reliability is needed.

Use Lambda Function URLs

Lambda Function URLs create dedicated HTTPS endpoints without API Gateway configuration. Format: https://<url-id>.lambda-url.<region>.on.aws

Setup:

1. In AWS Console, navigate to your Lambda function → Configuration → Function URL
2. Click Create function URL, set authentication to NONE for public access
3. Configure CORS: specify your Webflow domain in AllowOrigins, include POST and OPTIONS in AllowMethods
4. Copy the generated Function URL

Integration options

• Native Webflow forms: Set your Lambda Function URL in the form's Action field to POST form data directly. This works for simple submissions without custom validation.
• Custom JavaScript: For real-time validation feedback, multi-step forms, or custom error handling, intercept form submissions with JavaScript and POST to Lambda via fetch().

Use API Gateway

API Gateway provides custom domains, request throttling, usage plans, and detailed monitoring. Use HTTP APIs for lower cost with Lambda integration.

Configure CORS at both API Gateway level AND in Lambda function responses for browser compatibility. Lambda Function URLs are simpler for basic integrations; API Gateway is better for production sites handling thousands of requests daily.

Receive Webflow webhooks

Configure webhooks in Site Settings → Integrations → Webhooks. Select trigger events and paste your Lambda Function URL as the destination.

Webhook behavior:

• Webflow webhooks retry automatically 3 times at 10-minute intervals (~30-minute retry window)
• Signature verification is available via the x-webflow-signature header — validate using HMAC-SHA256 with your webhook secret
• Implement idempotent handlers to tolerate duplicate deliveries

Rate limits: Webflow allows 60-120 requests/minute depending on plan. Lambda functions calling Webflow APIs should implement exponential backoff for HTTP 429 responses.

What you can build

Integrate AWS Lambda with Webflow for serverless backend functionality.

• Advanced form processing: Lambda functions validate form data against business rules, score leads, then post to CRM APIs, email platforms, and Slack in parallel. Use native form Action field for simple cases or custom JavaScript for validation feedback.
• CMS automation: Schedule Lambda functions via EventBridge to pull content from external APIs, transform data, create Webflow collection items, and publish changes automatically.
• Inventory synchronization: Lambda webhook handlers receive stock updates from external systems and update Webflow CMS product fields via the PATCH endpoint.
• Secure payment processing: Implement Stripe Elements for client-side tokenization. Lambda receives only tokens (not card numbers) to create charges, keeping you out of PCI scope entirely.