Node js cant parse stringified json

Question

Hey im trying to send my ajax json input to my server, but it wont work.

At sending the json(stringified) to my server, my server is crying with: SyntaxError: Unexpected end of input at Object.parse (native)

But when im sending the same json via Postman, no error appears.

My ajax:

       $.ajax({
            method: "POST",
            url: "/new",
            data: {ort: park[0], activity: activity, datum: date, teilnehmerzahl: teilnehmerzahl, schwierigkeit : schwierigkeit, dauer : dauer, time : time, treffpunkt : treffpunkt},
            dataType: "json",
            success: function (data) {
                alert(data);
            }
            , error: function (jqXHR, textStatus, err) {
                alert('text status ' + textStatus + ', err ' + err)
            }
        });

Typical stringified json:

{"ort":"Bayerischer Wald","activity":"Klettern","datum":"17.09.2015","teilnehmerzahl":"2","schwierigkeit":"Anfänger","dauer":"1h","time":"12:00","treffpunkt":"Hier"}

My client:

app.post('/new', jsonParser, function(req,res){
    var test = JSON.stringify(req.body);
    fs.readFile('./views/neueGruppe.ejs', {encoding: 'utf-8'}, function(err, filestring){
        if(err){
            throw err;
        }
        else{
            var options = {
                host: 'localhost',
                port: 3000,
                path: '/new',
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'Content-Length': test.length
                }
            }

            var req = http.request(options, function(response) {
                response.on('data', function (chunk) {

                });
            });

            req.on('error', function(e) {
                console.log('problem with request: ' + e.message);
            });

// write data to request body
            req.write(test);
            req.end();
        }
    });
});

My server:

rest.post("/new", jsonParser, function(req,res){

    var data = {users:
        [
            {id: 1, name: "Peter"},
            {id: 2, name: "Jessica"}
        ]}


    console.log(req);
    res.json(data);


});

When i change the Content-Type on my client from Json to text, no error appears, but no data was send either. Its only happening when i try to send it as json, but even jsonlint says that its valid json...

score 3 · Accepted Answer · edited Apr 19 '16 at 13:17

Use the JSON.stringify Method To Send the Correct Request.

The JSON.stringify() method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified, or optionally including only the specified properties if a replacer array is specified.

Syntax

JSON.stringify(value[, replacer[, space]])

Source: Mozilla Contributors

JSON.stringify() converts a value to JSON notation

$.ajax({
    method: "POST",
    url: "/new",
    contentType: 'application/json; charset=utf-8',
    data: JSON.stringify({ort: park[0], activity: activity, datum: date, teilnehmerzahl: teilnehmerzahl, schwierigkeit : schwierigkeit, dauer : dauer, time : time, treffpunkt : treffpunkt}),
    dataType: "json",
    success: function (data) {
        alert(data);
    },
    error: function (jqXHR, textStatus, err) {
        alert('text status ' + textStatus + ', err ' + err)
    }
});

score 2 · Answer 2 · edited May 23 '17 at 12:24

To correctly send your JSON in request body, use JSON.stringify:

       $.ajax({
            method: "POST",
            url: "/new",
            contentType: 'application/json; charset=utf-8',
            data: JSON.stringify({ort: park[0], activity: activity, datum: date, teilnehmerzahl: teilnehmerzahl, schwierigkeit : schwierigkeit, dauer : dauer, time : time, treffpunkt : treffpunkt}),
            dataType: "json",
            success: function (data) {
                alert(data);
            }
            , error: function (jqXHR, textStatus, err) {
                alert('text status ' + textStatus + ', err ' + err)
            }
        });

More information can be found here: jQuery posting valid json in request body

Node js cant parse stringified json

2 Answers2