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I'm trying to create a JavaScript object from a JSON string "object" but it fails with the error:

"SyntaxError: JSON.parse: expected ',' or '}' after property value in object at line 1 column 48 of the JSON data"

var jsobj = JSON.parse( '{"lineID":11,"siteID":3,"mystring":"this is a \"Test\" string with quotes"}' );

I'm trying to create a JavaScript object from a JSON string "object" but it fails with the error:

"SyntaxError: JSON.parse: expected ',' or '}' after property value in object at line 1 column 48 of the JSON data"

var jsobj = JSON.parse( '{"lineID":11,"siteID":3,"mystring":"this is a \"Test\" string with quotes"}' );

mystring is a string which includes double quotes but I've escaped them correctly with the backslash. Why would it fail?

I noticed it passes OK on this online JSON parsing site: json parser

• javascript
• json
• parsing

Share Improve this question Follow asked May 23, 2018 at 14:00 PapillonUKPapillonUK 65288 silver badges2020 bronze badges

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2 Answers 2

Sorted by: Reset to default 8

The \ character is an escape character for JavaScript and JSON.

When the JavaScript parser parses the string literal it turns \" in the JavaScript source code into " in the string.

When the JSON parser parses the string, it finds an unescaped " and errors.

To include \" in the JSON data, you need to escape the \ in the JavaScript string literal: \\".

var jsobj = JSON.parse('{"lineID":11,"siteID":3,"mystring":"this is a \\"Test\\" string with quotes"}');
console.log(jsobj);

---

Nesting data formats is always a pain. It is best to avoid doing that whenever possible.

It doesn't make sense to have a string literal containing JSON in JavaScript in the first place.

JSON is a subset of JavaScript. Just use the JSON as a JavaScript literal.

var jsobj = {
  "lineID": 11,
  "siteID": 3,
  "mystring": "this is a \"Test\" string with quotes"
};

console.log(jsobj);

For double quotes you have to use double backslash

var jsobj = JSON.parse( '{"lineID":11,"siteID":3,"mystring":"this is a \\"Test\\" string with quotes"}' );

this should work

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