I’ve got a Node.js Lambda function that runs perfectly when I test it standalone. But when I connect it to Zapier, nothing gets passed back to the Zapier workflow. The function executes but Zapier doesn’t receive any response data.
I’m wondering if there’s a special callback pattern or response format that Lambda functions need to use when working with Zapier webhooks. Do I need to structure the return value in a particular way? Should I be using callback() instead of return statements?
Has anyone successfully integrated Lambda with Zapier and can share what the proper response format should look like?
I’ve experienced a similar issue, and the key is how your Lambda function responds. For Zapier to process the response correctly, ensure that your Lambda returns an object with the properties statusCode, headers, and body. The body must be a JSON string, so use JSON.stringify() on it. It’s also crucial that the Content-Type header is set to application/json. If you’re using API Gateway, make sure proxy integration is configured. If the response format is off, Zapier might not interpret the results properly.
yeah, zapier can be a pain with lambda! make sure you’re returning a proper json object with statusCode, headers, and a stringified body. i messed up on that too at first. also, don’t forget to set content-type to application/json or zapier won’t want your response.
I’ve hit this exact issue before. The problem is usually how Lambda handles async operations with Zapier. If you’ve got any async code - database calls, API requests, whatever - make sure you’re awaiting them before returning the response. My function worked fine when I tested it alone, but Zapier kept getting empty responses because Lambda was cutting off before the async stuff finished. Also check if you’re accidentally console.logging errors that mess with the response stream. Wrap your main logic in try-catch and make sure all promises resolve before the function exits.