javascript - Why can't I use ' instead of " for JSON string? -

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i have basic json string, surprise got error :

json unexpected token @ position 1

https://jsfiddle.net/5l2sgr57/

  var jsonstring = "{'name': 'john'}";   json.parse(jsonstring);

it works if switch ' " reason need since in javascript string ' , " supposedly equivalent ?

switch single , double quotation marks

var jsonstring = '{"name": "john"}'; json.parse(jsonstring);

json not equal javascript

json text format language independent uses conventions familiar programmers of c-family of languages, including c, c++, c#, java, javascript, perl, python, , many others. these properties make json ideal data-interchange language. (www.json.org)

you can verify allowed json syntax here

in syntax-definition string, can see 'is not allowed.

enter image description here


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