Uncaught SyntaxError: Unexpected token with JSON.parse

Solution 1:

products is an object. (creating from an object literal)

JSON.parse() is used to convert a string containing JSON notation into a Javascript object.

Your code turns the object into a string (by calling .toString()) in order to try to parse it as JSON text.
The default .toString() returns "[object Object]", which is not valid JSON; hence the error.

Solution 2:

Let's say you know it's valid JSON but your are still getting this...

In that case it's likely that there are hidden/special characters in the string from whatever source your getting them. When you paste into a validator, they are lost - but in the string they are still there. Those chars, while invisible, will break JSON.parse()

If s is your raw JSON, then clean it up with:

// preserve newlines, etc - use valid JSON
s = s.replace(/\\n/g, "\\n")  
               .replace(/\\'/g, "\\'")
               .replace(/\\"/g, '\\"')
               .replace(/\\&/g, "\\&")
               .replace(/\\r/g, "\\r")
               .replace(/\\t/g, "\\t")
               .replace(/\\b/g, "\\b")
               .replace(/\\f/g, "\\f");
// remove non-printable and other non-valid JSON chars
s = s.replace(/[\u0000-\u0019]+/g,""); 
var o = JSON.parse(s);

Solution 3:

It seems you want to stringify the object, not parse. So do this:

JSON.stringify(products);

The reason for the error is that JSON.parse() expects a String value and products is an Array.

Note: I think it attempts json.parse('[object Array]') which complains it didn't expect token o after [.

Solution 4:

I found the same issue with JSON.parse(inputString).

In my case the input string is coming from my server page [return of a page method].

I printed the typeof(inputString) - it was string, still the error occurs.

I also tried JSON.stringify(inputString), but it did not help.

Later I found this to be an issue with the new line operator [\n], inside a field value.

I did a replace [with some other character, put the new line back after parse] and everything is working fine.

Solution 5:

JSON.parse is waiting for a String in parameter. You need to stringify your JSON object to solve the problem.

products = [{"name":"Pizza","price":"10","quantity":"7"}, {"name":"Cerveja","price":"12","quantity":"5"}, {"name":"Hamburguer","price":"10","quantity":"2"}, {"name":"Fraldas","price":"6","quantity":"2"}];
console.log(products);
var b = JSON.parse(JSON.stringify(products));  //solves the problem