Amazon Gateway API with Lambda - Could not parse request body into json

Question

I seem to be getting a issue with Amazon Gateway API not liking my sent params for example.

$.ajax({
        url: "https://tibqwxuqoh.execute-api.us-east-1.amazonaws.com/dev/getitems",
        type: "POST",
        data: {
            "device": "test",
            "datetime": "1446757400919"
        },
        success: function (returnhtml) {
            console.log(returnhtml);
            $("#result").append("DOES NOT WORK - <br>" + JSON.stringify(returnhtml));
        }
    });

    $.ajax({
        url: "https://tibqwxuqoh.execute-api.us-east-1.amazonaws.com/dev/getitems",
        type: "POST",
        data: {},
        success: function (returnhtml) {
            console.log(returnhtml);
            $("#result").append("<br>WORKS ???? - <br>" + JSON.stringify(returnhtml));
        }
    });

Here is a working example. http://jsfiddle.net/Uwcuz/4315/

Can someone let me know why it wont let me send params every time i add a parameter i get this error.

{
    Type = User;
    message = "Could not parse request body into json.";
}

OK THIS WORKS BUT SEEMS A BIT WEIRD TO ME.

$.ajax({
        url: "https://tibqwxuqoh.execute-api.us-east-1.amazonaws.com/dev/getitems",
        type: "POST",
        data: "{\"device\": \"test\",\"datetime\": \"1446757444524\"}",
        success: function (returnhtml) {
            console.log(returnhtml);
            $("#result").append("WORKS - <br>" + JSON.stringify(returnhtml));
        }
    });

Carl · Accepted Answer · 2015-11-06 21:33:17Z

6

The problem lies in how you send the data to API Gateway. Without knowing the details of your API configuration I am guessing that you have a Request Mapping setup for application/json. jQuery will by default post your data as application/x-www-form-urlencoded but you want to send it as json.

You can do this without having to fiddle too much with the data yourself:

var requestParams = {
    url: "https://tibqwxuqoh.execute-api.us-east-1.amazonaws.com/dev/getitems",
    method: "POST,
    contentType: "application/json",
    dataType: "json",
    data: JSON.stringify({
        "device": "test",
        "datetime": "1446757400919"
    });
};
var request = $.ajax(requestParams);

The key here is JSON.stringify() and telling jQuery that the dataType is json as well as setting the contentType to application/json.

answered Nov 6, 2015 at 21:33

Carl

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