Failed to parse request body in json: Unexpected character (\ '- \' (code 45)) AWS Lambda + API + Postman

Question

I have been trying for several days to get the parameter sent from the API gateway in AWS to the Lambda function, and I have no success.

I decided to start from the beginning, so I followed their walkthrough ( http://docs.aws.amazon.com/apigateway/latest/developerguide/getting-started.html#getting-started-new-lambda )

I checked this walkthrough twice and I followed the steps to writing.

Problem

When I test the API from Postman or in Swift, I get an error message:

{"message": "Unable to parse the request body in json: Unexpected character (\ '- \' (code 45)) in numeric value: expected digit (0-9) to follow the minus for the actual numeric value \ n in [Source: [B @ c036d15; row: 1, column: 3] "}

At the postman, When I view the result as JSON, I just get

Bad line

Lambda function

A function is a basic example from the Walkthrough:

console.log('Loading event'); exports.handler = function(event, context) { var name = (event.name === undefined ? 'No-Name' : event.name); console.log('"Hello":"' + name + '"'); context.done(null, {"Hello":name}); // SUCCESS with message }; 

When testing with the Lambda Console and test data, I get the result:

 { "Hello": "TestUser123" } 

When testing from the Gateway API test, the result is also:

  { "Hello": "TestUser123" } 

Can anyone understand why both test consoles allow this work, but when they are tested using POSTMAN or used in Swift Script, it does not work?

Change 1

In postman, I set the content type application / json

Script returns the default value:

  { "Hello": "user" } 

However, when I add the name and TestUser123 to POSTMAN in the parameters, this is when it returns an error.

Update 1

So, I changed the mapping pattern to the one I found on another answer:

 { "name": "$input.params('name')" } 

Now the result:

 { "Hello": "" } 

Any ideas why he is not getting the name?

Answer 1

I was just stuck with this today.

your pattern matching:

 { "name": "$input.params('name')" } 

AWS uses AWS Velocity templates which; although it looks like JSON, different.

if you use

 { "name": $input.params('name') } // notice no quotes 

for the matching template right at the integration request step, then it should work as expected.