I’m working with a Node.js Lambda function that runs perfectly when tested independently. The problem starts when I connect it to Zapier workflows. Even though my function processes data correctly, Zapier doesn’t seem to get any response back from it.
I’m wondering if there’s a particular callback structure or response format that Lambda functions need to use when working with Zapier. My current function handles the logic fine, but the integration just isn’t picking up the output.
Does anyone know the proper way to format responses in Lambda so Zapier can read the returned data? Are there specific headers or response structures I should be using?
I encountered a similar problem during my integration with Zapier. It’s essential for your Lambda function to return the response in a format that Zapier can recognize. Make sure to structure your response with the properties statusCode, headers, and body. The body should contain JSON formatted data as a string. Additionally, set the Content-Type header to application/json. To send the response back, use the callback function with the format callback(null, response) as the second parameter is crucial for proper communication with Zapier.
Timeout config got me too on this exact issue. Zapier expects responses fast - if your Lambda takes too long, it just drops the connection without warning. I had to bump up my Lambda timeout and cut out heavy processing that was slowing things down. What really helped was logging the response object right before sending it back to see what Zapier actually got. Sometimes the data looks fine but has nested objects Zapier can’t handle. Make sure you’re sending stringified JSON, not a JavaScript object.
zapier’s picky with lambda responses. make sure you’re using async/await or return statements - don’t rely on callbacks. also check you’re not returning undefined values because zapier will choke on those. I ran into this exact problem where everything worked fine locally, but zapier kept bombing out until I properly wrapped my response data.