json.parse unexpected token error

Question

I'm trying to parse string to json object but i always get the same error SyntaxError: unexpected token '

var data = ('{' + fields.productName.toString() + ":" + parseInt(fields.quantity.toString()) + '}' );

I tried few variation of this but nothing works.

What is the value of fields.productName and fields.quantity? — madox2
– madox2, Commented Dec 13, 2015 at 10:33
Do not generate JSON manually, especially when you don't know the JSON syntax. Create an object and leave the stringification to JSON.stringify. — Ram
– Ram, Commented Dec 13, 2015 at 10:34

michelem · Accepted Answer · 2015-12-13 10:36:13Z

2

I don't think you need that, just do this:

var fields = {productName: 'hello', quantity: 1};
var data = {};
data[fields.productName.toString()] = parseInt(fields.quantity.toString());
console.log(JSON.stringify(data));

JSFiddle

answered Dec 13, 2015 at 10:36

michelem

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Comments

FINDarkside · Accepted Answer · 2015-12-13 10:39:22Z

2

You need to have quotes around the value name

data = ('{\"' + fields.productName.toString() + "\":" + parseInt(fields.quantity.toString()) + '}' );

But you should not generate json manually, because now you would need to escape all quotes that fields.productName.toString() includes. You should use JSON.stringify instead.

edited Dec 13, 2015 at 10:39

answered Dec 13, 2015 at 10:34

FINDarkside

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Comments

Eswar Rajesh Pinapala · Accepted Answer · 2015-12-13 10:35:51Z

1

Best way to avoid issues :

  var data = {};
  data[fields.productName.toString()] = parseInt(fields.quantity.toString());

P.S. Leverage the beauty of JS objects, Do not re-invent the wheel by constructing object using strings :)

answered Dec 13, 2015 at 10:35

Eswar Rajesh Pinapala

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2 Comments

almog Over a year ago

i'm getting [Object Object] SyntaxError: Unexpected token o

Eswar Rajesh Pinapala Over a year ago

Are you trying to do alert()? If so, Always remember to stringify JS objects.

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