I have a array Json like this in node js.
JSON 1
var json1= {
bookmarkname: 'My Health Circles',
bookmarkurl: 'http://localhost:3000/',
bookmark_system_category: [ '22', '1' ]
}
JSON 2
var json2 = {
bookmarkname: 'My Health Circles',
bookmarkurl: 'http://localhost:3000/',
bookmark_system_category:'22'
}
I tried :
var length1=json1.bookmark_system_category.length;
var length1=json2.bookmark_system_category.length;
Expected output :
l1=2;
l2=1;
lengthis property ofstringas well asarray
In your second case, it is counting length of the string which is 2
May be you will need a condition:
var json1 = {
bookmarkname: 'My Health Circles',
bookmarkurl: 'http://localhost:3000/',
bookmark_system_category: ['22', '1']
};
var json2 = {
bookmarkname: 'My Health Circles',
bookmarkurl: 'http://localhost:3000/',
bookmark_system_category: '22'
};
var getLength = function(input) {
if (typeof input === 'string') {
return 'Is String';
} else {
return input.length;
}
}
var length1 = getLength(json1.bookmark_system_category);
var length2 = getLength(json2.bookmark_system_category);
alert(length1);
alert(length2)You could use Array.isArray:
Array.isArray(json1.bookmark_system_category); // true
but this would return false for everything that isn't an array - strings, objects, null.
Here's a nifty function that will return the type of an object (in lowercase) that you can test against:
function toType(x) {
return ({}).toString.call(x).match(/\s([a-zA-Z]+)/)[1].toLowerCase();
}
toType({}) // object
toType([]) // array
toType(null) // null
toType(0) // number
toType('bob') // string
So:
toType(json1.bookmark_system_category) // array
toType(json2.bookmark_system_category) // string