JSON.Stringify() force int value javascript(node.js)

Question

Good day everyone i've been trying to force the data of my Json.stringify to int because on my mongodb it returns as string so on my schema i need to do it like this first

var UserSchema = mongoose.Schema({
    username:{
        type: String,
        index:true
    },
    influenceid:{
        type:String
    },
    question:{
        type:String
    },
    amount:{
        type:String //i need this to be a type:Number instead of string
    }
});

and on my dialog.js where in i put the json data

 socket.emit('dollar quest', JSON.stringify(result[0]), 
 JSON.stringify(result[1]), inUserId, myuserid, 'dquest');

and on my server i fetch data like this to throw it to my mongodb

socket.on('dollar quest', function(dolquest,dolamnt,uid,stud,stat){
    var info = new InfoUser({
        username: stud,
        amount: dolamnt,
        question: dolquest
    });

    InfoUser.createUser(info,function(err,user){
        if(err)throw err;
        console.log(user);
    });
});

But the output on my mlab is like this

"username": "stsam1",

"amount": "\"12500\"",

"question": "\"how are you\"",

How can i turn my amount into type:Number so that it will return on my mlab as like this

"amount": 12500,

T.J. Crowder · Accepted Answer · 2017-07-11 12:34:02Z

2

You can provide a replacer function to JSON.stringify which will convert the value to number when the key name is "amount":

function theReplacer(key, value) {
    return key === "amount" ? +value : value;
}

then

var json = JSON.stringify(yourObject, theReplacer);

function theReplacer(key, value) {
    return key === "amount" ? +value : value;
}
var object = {
    username: "a",
    influenceid: "b",
    question: "c",
    amount: "42"
};
var json = JSON.stringify(object, theReplacer, 2);
console.log(json);

That example will convert the value of any "amount" field to a number, but you can refine it if you need to limit that.

answered Jul 11, 2017 at 12:34

T.J. Crowder

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4 Comments

Ginxxx Over a year ago

but my JSON.Stringify(result[1]) is my dolamnt on my server and on my schema when i try to change it to type:number is doesn't work and doesn't return an error why is that??

T.J. Crowder Over a year ago

@TheGinxx009: "dolamnt" isn't a word in the English language, and I'm afraid I can't infer what you meant there. You asked how to ensure that the amount, which is a string in your object, is a number in the JSON. The above is how you do that.

Ginxxx Over a year ago

okay i get it now . dolamnt was being shorten cause it is a variable "dolaramount" is what its meant.

Ginxxx Over a year ago

correction sir . i'm sorry but the string wasn't an object . it's a general variable

Shaishab Roy · Accepted Answer · 2017-07-11 12:40:32Z

0

You can make amount field is Number then it will automatically convert to Number from string

amount:{
   type: Number
}

or you can use parse.float like

socket.on('dollar quest', function(dolquest,dolamnt,uid,stud,stat){
    var info = new InfoUser({
        username: stud,
        amount: parseFloat(dolamnt),
        question: dolquest
    });

    InfoUser.save(function(err,user){
        if(err)throw err;
        console.log(user);
    });
});

answered Jul 11, 2017 at 12:40

Shaishab Roy

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7 Comments

Shaishab Roy Over a year ago

which one you tried ? N.B: should Number instead number

Ginxxx Over a year ago

type:Number on my schema and parseFloat(dolamnt), on the server side

Ginxxx Over a year ago

When i try this it always says infousers validation failed

Shaishab Roy Over a year ago

you may trying to same username can try by different user name and try InfoUser.save like my code

Ginxxx Over a year ago

sorry sir but i can't understand what you're saying

|

Ginxxx · Accepted Answer · 2017-07-12 04:34:25Z

0

I dig this one and it works on me so i'll answer my own question but thank you for the help sir T.J and Shaib. Here's what i did.

 socket.emit('dollar quest', JSON.stringify(result[0]), 
 JSON.stringify(result[1]), inUserId, myuserid, 'dquest');

and added

 socket.emit('dollar quest', JSON.stringify(result[0]), 
 JSON.stringify(result[1]).replace(/\"/g, ""), inUserId, myuserid, 'dquest');

So the idea was replacing so Sir TJ was has the right idea

answered Jul 12, 2017 at 4:34

Ginxxx

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