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...

it shows the object, this is weird this is working but sometimes it crashes can't tell why — François Richard
– François Richard, Commented Mar 25, 2015 at 15:43
console.dir(body) shows an object? It should show a string. You could try setting json: true in your request() options. — mscdex
– mscdex, Commented Mar 25, 2015 at 15:49
What is the actual stack trace? Is the error pointing to your JSON.parse(body) or is it coming from somewhere inside .send(datas) ? — mscdex
– mscdex, Commented Mar 25, 2015 at 15:54
So I guess it comes from the JSON.parse but why does it occurs sometimes only ? I have to send the request few times to reproduce the bug. — François Richard
– François Richard, Commented Mar 25, 2015 at 16:02

Hertzel Guinness · Accepted Answer · 2017-07-18 10:53:37Z

13

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);
}

edited Jul 18, 2017 at 10:53

Hertzel Guinness

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answered Mar 25, 2015 at 22:41

Chris

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1 Comment

François Richard Over a year ago

the real problem was inside my calculate function, I was creating an object and working on fields that was being created (not created yet) so I resolved this using a promise. Your answer is a good tip anyway thank you.

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