examples/intro/json_parse_nan.html
<script>
var str = '{ "v" : 42 }';
console.log(JSON.parse(str)); // Object {v: 42} 

str = '{ "n" : null }';
console.log(JSON.parse(str)); // Object {n: null} 

str = '{ "x" : NaN }';
console.log(JSON.parse(str)); // Uncaught SyntaxError: Unexpected token N 

str = '{ "y" : Infinite }';
console.log(JSON.parse(str)); // Uncaught SyntaxError: Unexpected token I
</script>
Object { v: 42 } json_parse_nan.html:3:0
Object { n: null } json_parse_nan.html:6:0
SyntaxError: JSON.parse: unexpected character at line 1 column 9 of the JSON data