Query regarding Difference between JavaScript Object And JSOn Object

Question

Here is my question: in java script: we hav an object:

var someObject={"name":"somename"};

Now we want to get the name ,we ll do

alert(someObject.name); //it will print somename Right?

Same object i get from a source which sends a JSON object as

someJSONObject={"name":"someName"};

Now in my javascript code ,without parsing this someJSONObject ,i can get name as

alert(someJSONObject.name);

If it is so ,why we need to convert JSON Object to a javaScript Object by parsing it ,when we can use it as an object without parsing or using eval()?

Thanks !

Esailija · Accepted Answer · 2013-04-22 13:18:31Z

1

Because it's not a JSON Object. The syntax {"name":"someName"}, with quoted keys, does not make it JSON, the same syntax is supported by Javascript object literals.

JSON can be embedded in Javascript strings. Like:

var json = '{"key": "value"}';

Then you can parse it into Javascript data types:

var obj = JSON.parse( json );

Note that eval may cause syntax errors because the syntaxes of JSON and Javascript are not ultimately compatible. The above would have caused a syntax error if evaled.

answered Apr 22, 2013 at 13:18

Esailija

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6 Comments

user2110167 Over a year ago

thanks for the reply .But when i can use JSONobject received from server in the same way as my normal javascript object,why we have to parse it and make it to a javascript object ?Why parsing is necessary if all the operations can be performed without it ?

Esailija Over a year ago

@user2110167 Are you talking about embedding it inside <script> element? Then it is evaluated as Javascript code, and it might work depending on many factors.

user2110167 Over a year ago

i have a javascript function which receives a JSON object from Java code .If i don't parse that JSON object received and try to access the keys inside it ,i am able to do that .

Esailija Over a year ago

@user2110167 If you are embedding JSON serialization inside Javascript context, then it will be evaluated as Javascript. Because of the 99.99% compatible syntax, it will work.

user2110167 Over a year ago

I was just confused between the two form of objects,because they look same too.Sorry for asking such a silly question.Thanks

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Evan Davis · Accepted Answer · 2013-04-22 13:19:08Z

1

JSON is a string, so it's something like var jsonObject = '{"name":"someName"}'; an object is an object.

answered Apr 22, 2013 at 13:19

Evan Davis

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3 Comments

user2110167 Over a year ago

Fine jsonObject is a string,then if i try to acces the name inside it ,i can simply do jsonObject.name .Why we need to parse it then ?

Mchl Over a year ago

Well no, you can't access it via jsonObject.name. THat's the point

user2110167 Over a year ago

@Mchl You are right.i tried that and its a difference between the two .Thanks

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