javascript - Parse function inside Json - Stack Overflow

I have this JSON as a result of the function JSON.stringify():

{"get":"function (f,g){'use strict';var h,i;if(i={},'string'==typeof f){if('object'==typeof g)for(h in g)i[h]=g[h];i.url=f}else if('object'==typeof f)for(h in f)i[h]=f[h];return i.type=i.type||d,i.oauthio={provider:a,tokens:b,request:c},e.http(i)}","post":"function (f,g){'use strict';var h,i;if(i={},'string'==typeof f){if('object'==typeof g)for(h in g)i[h]=g[h];i.url=f}else if('object'==typeof f)for(h in f)i[h]=f[h];return i.type=i.type||d,i.oauthio={provider:a,tokens:b,request:c},e.http(i)}"}

How you can see there are functions inside values. I want to rebuild this JavaScript object, my goal is to remove the quotes in the risult but also the values; because functions, in this case, are recognized as string. I want something like this:{key : value}

Now I get:{key : "value"}

I have this JSON as a result of the function JSON.stringify():

{"get":"function (f,g){'use strict';var h,i;if(i={},'string'==typeof f){if('object'==typeof g)for(h in g)i[h]=g[h];i.url=f}else if('object'==typeof f)for(h in f)i[h]=f[h];return i.type=i.type||d,i.oauthio={provider:a,tokens:b,request:c},e.http(i)}","post":"function (f,g){'use strict';var h,i;if(i={},'string'==typeof f){if('object'==typeof g)for(h in g)i[h]=g[h];i.url=f}else if('object'==typeof f)for(h in f)i[h]=f[h];return i.type=i.type||d,i.oauthio={provider:a,tokens:b,request:c},e.http(i)}"}

How you can see there are functions inside values. I want to rebuild this JavaScript object, my goal is to remove the quotes in the risult but also the values; because functions, in this case, are recognized as string. I want something like this:{key : value}

Now I get:{key : "value"}

• javascript
• json
• function

Share Improve this question Follow edited Mar 26, 2015 at 16:07 Claudio asked Mar 25, 2015 at 16:09 ClaudioClaudio 4511 gold badge11 silver badge99 bronze badges 3

• 5 With eval or Function (after some preprocessing). You can automate this by passing a reviver function to JSON.parse, just as explained in the MDN documentation. I strongly advice against storing functions as data though. – Felix Kling Commented Mar 25, 2015 at 16:12
• I've tried both, but nothing . eval doesn't work because the values ​​missing the function name. – Claudio Commented Mar 25, 2015 at 16:18
• 1 eval('(' + str + ')') – Felix Kling Commented Mar 25, 2015 at 16:35

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 5

QUICK ANSWER:

The function bellow will do it:

function fix(obj){

    for (var property in obj) {
        if (obj.hasOwnProperty(property)) {
            obj[property] = eval("(" + obj[property] + ")");
        }
    }

}

If obj has your JSON parsed object then just do the following:

fix(obj);
console.log(obj); // in case you want to see the change in the console

EXPLANATION (IF YOU NEED ONE):

You will be able to get the javascript function expression if you enclose the string with parentheses '()' before invoking eval.

So the steps to achieve the desired result are:

1. Enclose the function expression string in parentheses (see footnotes for the reason why)
2. Invoke the eval function to evaluate the function declaration expression
3. Assign the function declaration expression to the same property that contained the string value

For the simplistic example you gave, you can get the desired results by:

var obj = {"get":"function (f,g){'use strict';var h,i;if(i={},'string'==typeof f){if('object'==typeof g)for(h in g)i[h]=g

[h];i.url=f}else if('object'==typeof f)for(h in f)i[h]=f[h];return i.type=i.type||d,i.oauthio=

{provider:a,tokens:b,request:c},e.http(i)}","post":"function (f,g){'use strict';var h,i;if(i={},'string'==typeof f){if

('object'==typeof g)for(h in g)i[h]=g[h];i.url=f}else if('object'==typeof f)for(h in f)i[h]=f[h];return i.type=i.type||

d,i.oauthio={provider:a,tokens:b,request:c},e.http(i)}"};

obj.get = eval("(" + obj.get + ")");
obj.post = eval("(" + obj.post + ")");

You can automate that by using the following function:

function fix(obj){

    for (var property in obj) {
        if (obj.hasOwnProperty(property)) {
            obj[property] = eval("(" + obj[property] + ")");
        }
    }

}

Your final code should be something like:

function fix(obj){

        for (var property in obj) {
            if (obj.hasOwnProperty(property)) {
                obj[property] = eval("(" + obj[property] + ")");
            }
        }

    }


var obj = {"get":"function (f,g){'use strict';var h,i;if(i={},'string'==typeof f){if('object'==typeof g)for(h in g)i[h]=g

    [h];i.url=f}else if('object'==typeof f)for(h in f)i[h]=f[h];return i.type=i.type||d,i.oauthio=

    {provider:a,tokens:b,request:c},e.http(i)}","post":"function (f,g){'use strict';var h,i;if(i={},'string'==typeof f){if

    ('object'==typeof g)for(h in g)i[h]=g[h];i.url=f}else if('object'==typeof f)for(h in f)i[h]=f[h];return i.type=i.type||

    d,i.oauthio={provider:a,tokens:b,request:c},e.http(i)}"};

fix(obj);

---

Footnotes:

In case you have interest to know why the parentheses are needed please check the link below:

Why does JavaScript's eval need parentheses to eval JSON data?

this solution is better than using eval :

let's say obj contains your json, which means the function is obj.get but it is a sting, to convert it to a real function, you can use the constructor Function

obj.get = new Function(obj.get);

Note that I tried it on your code but the string you have posted has some errors on it. make sure your function is correct.