convert json array to var values in node.js express.js

Question

i am trying go convert my json array in to simple (numbered)values. getting them from database(.find), the problem is they are not converting with json.parse. am i doing something wrong?

 Voltage.find({},function (err, data) {
        var jsontext = data;
        var parsedData = JSON.parse(jsontext);
        res.json(parsedData);
        console.log(parsedData);
    });

ths is the console.log for the session, i was hoping for just: 333, 333, 333 etc.

[{"_id":"56f3c19a0298308405d60464","temp":333,"__v":0},{"_id":"56f3c1ee7ec57884068dcb2c","temp":333,"__v":0},{"_id":"56f3c4467ec57884068dcb2d","temp":333,"__v":0},{"_id":"56f3d80191a3c68c138bf04d","temp":337,"__v":0},{"_id":"56f3da3f06cefa781763fb21","temp":337,"__v":0}]

it is the temp values i am trying to get out to send to my front end only. i am using mongooose, express.js and node.js with a mongodb also. thanks for looking.

Andrius · Accepted Answer · 2016-03-24 12:59:29Z

1

One thing you could do is deselect them in the query:

 Voltage.find().select('-_id -__v').exec(function (err, data) {
        var jsontext = data;
        var parsedData = JSON.parse(jsontext);
        res.json(parsedData);
        console.log(parsedData);
    });

Read up on the select method here.

answered Mar 24, 2016 at 12:59

Andrius

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2 Comments

Gerald Greene Over a year ago

thats great, thanks. that has narrowed it down a bit,i need to give the value if temo over as a var '333' . any idea how to do that? thanks again

Gerald Greene Over a year ago

i am getting back this message upon parsing {undefined:1 { temp: 333 },{ temp: 333 },{ temp: 333 },{ temp: 333 },{ temp: 333 },{ temp: ^ SyntaxError: Unexpected token t at Object.parse (native)

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