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From the node REPL:

> JSON.parse('{"key" : "value"}')
{ key: 'value' }
> JSON.parse('{key : "value"}')
SyntaxError: Unexpected token ILLEGAL
    at Object.parse (native)
    at [object Context]:1:6
    at Interface.<anonymous> (repl.js:171:22)
        at Interface.emit (events.js:64:17)
    at Interface._onLine (readline.js:153:10)
    at Interface._line (readline.js:408:8)
    at Interface._ttyWrite (readline.js:585:14)
    at ReadStream.<anonymous> (readline.js:73:12)
    at ReadStream.emit (events.js:81:20)
    at ReadStream._emitKey (tty_posix.js:307:10)

From the node REPL:

> JSON.parse('{"key" : "value"}')
{ key: 'value' }
> JSON.parse('{key : "value"}')
SyntaxError: Unexpected token ILLEGAL
    at Object.parse (native)
    at [object Context]:1:6
    at Interface.<anonymous> (repl.js:171:22)
        at Interface.emit (events.js:64:17)
    at Interface._onLine (readline.js:153:10)
    at Interface._line (readline.js:408:8)
    at Interface._ttyWrite (readline.js:585:14)
    at ReadStream.<anonymous> (readline.js:73:12)
    at ReadStream.emit (events.js:81:20)
    at ReadStream._emitKey (tty_posix.js:307:10)
  • javascript
  • json
  • node.js
Share Improve this question asked Aug 11, 2011 at 13:46 João Pinto JerónimoJoão Pinto Jerónimo 9,86420 gold badges64 silver badges87 bronze badges
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3 Answers 3

Reset to default 14

All keys in JSON are strings, and all strings are delimited by double quotes.

JavaScript allows you to use different characters to delimit strings, and it allows you to use identifiers as keys in an object literal — but JSON is not JavaScript.

JSON expects both keys and values to be strings.

http://www.json/js.html

Because your second example isn't JSON.

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