带反斜杠的JSON解析错误

Question

I have been trying to figure out why the following JSON input will be failed to parse in JSON.parse function.

{"World":"Hello\\Test"}

The json above is being returned by JSON.NET.

I have tried multiple methods to get this working. As you can see the backslash is escaped and https://jsonlint.com/ is able to parse it.

I have a failing sample at https://jsfiddle.net/ckp0uc0p/3/ as well.

Any help will be appreciated.

Answer 1

You need to add two \\\\ for every backslash you want to have it displayed. If you're parsing a json, to display 2 backslashes you need to add 4.

 // inside a string to be parsed as json var json = '{"World":"Hello\\\\\\\\Test"}' console.log(JSON.parse(json)) // directly in an object var object = {"World": "Hello\\\\Test"} console.log(object) 

Answer 2

The best way to inject JSON into JavaScript source code (when generating the JavaScript with a server side language), is to inject it directly where you need it, not inside a string literal that needs to be parsed.

For example:

var foo = <json blob>;

so that the result will be

var foo = {"World":"Hello\\Test"};

JavaScript will interpret this as an object literal resulting in an object , which is what you want to get anyway. This avoids all the problems with "nested" escape sequences.

Answer 3

 try { var res = '{"World":"Hello\\\\\\\\Test"}'; var s = JSON.parse(res); console.log(JSON.stringify(s)); } catch(error) { alert(error); }