JSON undefined when looking with string

Question

I'm not quite sure what my problem is here.

This is my json:

user = {
    userdata: {
        name: "Test"
    }
}

And while user.userdata.name returns Test, user["userdata.name"] returns undefined.

Also user["userdata"] is returning the userdata json just as well. And user["userdata"]["name"] is also returning Test.

I'm using the same method on another json, but not searching to deep. just for userdata. and there is works just fine...

"This is my json" No, it isn't. It's a JavaScript object initializer being assigned to a variable. JSON is a textual notation for data exchange (and doesn't have the = operator, because it's not a programming language). If you're in JavaScript source code, and not talking about the contents of a string, it's not JSON. — T.J. Crowder
– T.J. Crowder, Commented Sep 25, 2015 at 12:04

T.J. Crowder · Accepted Answer · 2015-09-25 12:04:51Z

4

And while user.userdata.name returns Test, user["userdata.name"] returns undefined.

Correct. The bit in quotes is used, in its entirety, as the property name to look up. It's not parsed. Since your user object doesn't have a property called userdata.name (it has userdata, which in turn has name), the value you get is undefined.

If you wanted to access that name with brackets notation it would be user["userdata"]["name"] (where the strings can be literal strings, as shown, or the result of any expression such as a variable lookup, string concatenation, etc.).

answered Sep 25, 2015 at 12:04

T.J. Crowder

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Bala.Raj · Accepted Answer · 2015-09-25 12:05:42Z

2

Can Access like this.

user["userdata"]["name"]

answered Sep 25, 2015 at 12:05

Bala.Raj

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