Extract parameter value from response body using Newman

Question

I am trying to extract a specific value returned from an API response, example below. I have extracted the entire body using response.stream.toString() using Newman.

However I am struggling to extract the value 48.00 below when using Newman to run a postman collection.

Is there a way I could use the JSON path (x.cost) to extract the value rather than having to manipulate the string returned for the entire body?

Any help would be much appreciated.

{
    "cost": 48.00,
    "min": 4.000,
    "max": 266.95
}

Answer 1

Wouldn't something simple like this work here:

const newman = require('newman');

newman.run({
   collection: 'collection.json'
}).on('request', (error, args) => {
   console.log(JSON.parse(args.response.stream.toString()).cost);
});

I'm taking a guess and assuming that you're using Newman as a library here.