AWS Lambda Payloads

Question

I searched on AWS Lambda documentation but couldn't find an answer to my problem.

Is there a way I can access the entire request body from a Lambda function (written in node.js)?

The event parameter only seems to contain parsed JSON properties.

Answer 1

Your request body needs to be in XML or JSON in order to be able to access it in your Lambda function. You need to specify how it's processed/mapped and passed through in Integration Request section of the API Gateway dashboard.

Answer 2

You can access the request body in AWS Lambda once you expose it in a Body Mapping Template.

1. Open up your method in API Gateway console
2. Open Integration Request
3. In Integration Request, open the Body Mapping Templates panel
4. Add a Content Type of application/json
5. Click on your freshly created application/json item
6. Add the following template:

 {
   "body" : $input.json('$')
 }

After that you can access the request body as event.body in your Node.js Lambda Function.