Convert function string in JSON to JS function inside an object? [duplicate]

Question

I have a requirement where I convert a function that is in JSON to a JS object. How can I do that? For example,

If I have the JSON object like:

{"obj":{ "a": "abc", "b": "(v) => { console.log('Hi', v) }" } }

Then I want the above JSON to convert it back to the original object:

const obj = { a: 'abc', b: (v) => { console.log('Hi', v) } }

Is this possible? And can it be done without using eval?

Currently when I do stringify & parse the function is getting ignored

Also I want to add that I want to construct the desired JS object but not actually evaluate/run the function.

You say you'd like to avoid eval, but you want to evaluate an arbitrary string as code right? What's wrong with eval here? Maybe this helps? stackoverflow.com/questions/7650071/… — CollinD
– CollinD, Commented Jun 7, 2022 at 21:29
@CollinD Thank you for the response. I was just trying to see if I can just construct the desired object but not actually evaluate or run the function — kartik gavara
– kartik gavara, Commented Jun 7, 2022 at 21:35
Hi plichard, Like I mentioned in the question. I dont want to log the console statement or run the function, but simply construct the JS object with the function. I want to convert {"obj":{ "a": "abc", "b": "(v) => { console.log('Hi') }" } }(JSON) to const obj = { a: 'abc', b: (v) => { console.log('Hi') } } (JS object) — kartik gavara
– kartik gavara, Commented Jun 7, 2022 at 22:10

Lucas Roquilly · Accepted Answer · 2022-06-07 21:43:59Z

1

This is how I would do it using new Function(argument,function_body)

const json = '{"obj":{ "a": "abc", "b": "console.log(\'Hi\')" } }'
const data = JSON.parse(json);
var f = new Function(data.obj.a,data.obj.b);
f();

answered Jun 7, 2022 at 21:43

Lucas Roquilly

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3 Comments

kartik gavara Over a year ago

Hi Lucas, Like I mentioned in the question. I dont want to log the console statement, but simply construct the JS object with the function. I want to convert {"obj":{ "a": "abc", "b": "(v) => { console.log('Hi') }" } }(JSON) to const obj = { a: 'abc', b: (v) => { console.log('Hi') } } (JS object)

Lucas Roquilly Over a year ago

Hi Kartik, well in my snippet the JS object is the data variable

kartik gavara Over a year ago

In my usecase, i have an anonymous function like i showed in the example which also takes in some arguments. So, is that something that is possible?

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Convert function string in JSON to JS function inside an object? [duplicate]

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