SyntaxError: Unexpected end of input at Object.parse (native) npm request

Question

Hello I don't understand why I have this error, I thought the callback was executed once the data has been received, any idea where this come from ? Thanks a lot!

Node error:

SyntaxError: Unexpected end of input
  at Object.parse (native)

I parse the body's answer send it to a calculate function before sending it to the page =/

var options = {
        method: 'POST',
        url: self.rippledataapiProxyHost.account_offers_exercised,
        headers: {
            "Content-Type": "application/json",
            "Accept": "application/json"
        },
        body:parameters 
    };

    var callback = function(error, response, body) {
        if (error) {
            console.log('error', error);
            res.send(500, 'something went wrong');
        }
        console.dir("bodyyyyyyyy====>",body);
        var rippleoffersexercised = new self.datacalcul.rippleoffersexercised;
        var data = JSON.parse(body);
        var datas = rippleoffersexercised.calculate(data);
        res.status(response.statusCode).send(datas);
    }
    request(options, callback);

Here is the stack trace:

'bodyyyyyyyy====>'

SyntaxError: Unexpected end of input
  at Object.parse (native)
  at Request.callback [as _callback] (/home/francois/dev/ripplereport/webserver-newclientFrancois/server/middlewares/proxy/rippledataapiProxy.js:77:20)
  at Request.self.callback (/home/francois/dev/ripplereport/webserver-newclientFrancois/node_modules/request/request.js:344:22)
  at Request.emit (events.js:98:17)
  at Request.<anonymous> (/home/francois/dev/ripplereport/webserver-newclientFrancois/node_modules/request/request.js:1239:14)
  at Request.emit (events.js:117:20)
  at IncomingMessage.<anonymous> (/home/francois/dev/ripplereport/webserver-newclientFrancois/node_modules/request/request.js:1187:12)
  at IncomingMessage.emit (events.js:117:20)
  at _stream_readable.js:943:16
  at process._tickCallback (node.js:419:13)

[gulp] [nodemon] app crashed - waiting for file changes before starting...

Answer 1

As discussed in the comments, you are probably getting empty or malformed requests which cause the JSON.parse to throw. Something like this should help you:

var callback = function(error, response, body) {
    if (error) {
        console.log('error', error);
        return res.send(500, 'something went wrong');
    }
    try {
        var data = JSON.parse(body);
    } catch(e) {
        console.log('malformed request', body);
        return res.status(400).send('malformed request: ' + body);
    }
    console.log('body', body);
    var rippleoffersexercised = new self.datacalcul.rippleoffersexercised;
    var datas = rippleoffersexercised.calculate(data);
    return res.status(response.statusCode).send(datas);
}