Create json object dynamic in nodejs

Question

I have json :

{
   "fullName": "abc",
   "age": 19,
   ...
}

I want use Nodejs to add element in above json to object named Variables in below json

{
  "variables": {
    "fullName" : {
        "value" : "abc",
        "type" : "String"
    },
    "age": {
        "value" : 19,
        "type": "Number"
    },
    ...
  }
}

Please help me this case!

are you asking how to split your json and inject objects like type and value? or is it something else — rand0m
– rand0m, Commented Sep 23, 2020 at 6:22
@rand0m : I want to change json from old structure to new structure ! — Java Dev Beginner
– Java Dev Beginner, Commented Sep 23, 2020 at 6:25

Ilijanovic · Accepted Answer · 2020-09-23 06:28:57Z

4

You can use Object.entries with .reduce()

let data = {
   "fullName": "abc",
   "age": 19,
}

let result = Object.entries(data).reduce((a, [key, value]) => {
   a.variables[key] = { value, type: typeof value}
   return a;
}, { variables: {}})

console.log(result);

answered Sep 23, 2020 at 6:28

Ilijanovic

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Comments

Rajneesh · Accepted Answer · 2020-09-23 06:33:04Z

2

We can first entries of that object and then map it accordingly after that we convert that object using Object.fromentries. Here is an implementation:

const obj = {  "fullName": "abc", "age": 19 };

const result = Object.fromEntries(Object.entries(obj).map(([k,value])=>[k,{value, type:typeof value}]));

console.log({variable:result});

edited Sep 23, 2020 at 6:33

answered Sep 23, 2020 at 6:25

Rajneesh

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2 Comments

Java Dev Beginner Over a year ago

Thanks gorak! But I' using nodejs typescipt so it show error Property 'fromEntries' does not exist on type 'ObjectConstructor'.ts(2339)

Rajneesh Over a year ago

@JavaDevBeginner Then one of solution with reduce will work. Or if your using lodash or underscore. You have an fromPairs method which will work instead of Object.fromEntries

Nitsuj · Accepted Answer · 2020-09-23 06:21:52Z

0

Are you looking for JSON.parse to get a struct from your file, then JSON.stringify to create a json from your struct ?

answered Sep 23, 2020 at 6:21

Nitsuj

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1 Comment

Java Dev Beginner Over a year ago

Yes. I want to change json from old structure to new structure !

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