Question

for example my json string is like this :

{
"v1" : [], 
"v2": 2, 
"v3": f()
}

Now the context in which I need to decode this has a definition of f and f() gives right answer in that context(checked via debugger). But JSON.parse(jsonstring) gives me Unexpected token. eval also gives error. What should I do?

See an example Here

Answer 1

Why it does not work

Look at the definition of a JSON, it can not contain function calls.

Possible workarounds

One way is to do something like this, return a string of the function you want to call.

{
    "v1" : [], 
    "v2": 2, 
    "v3": "f"
}

Now when you need to access it, you can call the function.

var myJSON = JSON.parse(jsonstring);
var myFunctionResult = window[myJSON.v3]();  //works if global variable

Other option is to change how your code works and make an async script call [jQuery would be getScript, regular JavaScript createElement("script") with appendChild() and use a callback like JSONP does.