How to rename JSON element in Nodejs

Question

I have an API that response JSON data like this-

  {
"unitcode":"apple",
"description":"bus",
"color":"red",
"intent":"Name 1"
 }

I want to change like this-

  {
"Value1":"apple",
"Value2":"bus",
"value3":"red",
"value4":"sale"
 }

Presently, I can code to rename single key but i want some code to replace all key in one shot. my code like this-

request(baseurl)
        .then( body => {
             var unit = JSON.parse(body);
             unit.intent = "sales"
             unit.value1 = unit.unitcode
             delete unit.unitcode;
             console.log(unit)
             console.log(unit.Value1)
             var unit2 = JSON.stringify(unit)

        // let code = unit.description;
         conv.ask('Sales is 1 million metric tonnes ' + unit2);
          })

please help me out on this and please little elaborate also to learn something new. thanks

Answer 1

Create a Map of original key to new key ( transformMap ). Convert the object to pairs of [key, value] with Object.entries() , iterate with Array.map() and replace the replacement key from the Map (or the original if not found). Convert back to an object with Object.toEntries() :

 const transformMap = new Map([ ['unitcode', 'Value1'], ['description', 'Value2'], ['color', 'Value3'], ['intent', 'Value4'] ]); const transformKeys = obj => Object.fromEntries( Object.entries(obj) .map(([k, v]) => [transformMap.get(k) || k, v]) ); const obj = { "unitcode": "apple", "description": "bus", "color": "red", "intent": "Name 1" }; const result = transformKeys(obj) console.log(result)

Answer 2

If you know the object structure and it is constant, you could just use destructing like so.

 const data = { "unitcode":"apple", "description":"bus", "color":"red", "intent":"Name 1" }; // If the object is fixed and the fields are known. const mapData = ({ unitcode, description, color, intent }) => ({ Value1: unitcode, Value2: description, Value3: color, Value4: intent }); console.log(JSON.stringify(mapData(data)));

But if the object has an unknown number of properties:

 const data = { "unitcode":"apple", "description":"bus", "color":"red", "intent":"Name 1" }; // If the object is fixed and the fields are known. const mapData = (data) => { return Object.keys(data).reduce((a,v,i) => { a[`Value${i+1}`] = data[v]; return a; }, {}); }; console.log(JSON.stringify(mapData(data)));

Answer 3

Well your target is to modify the keys and retain the value In that context, you can iterate through your data. To dynamically generate keys as Value1 , Value2 , etc, we will append Value with iteration index which is going to be unique always.

const modifyInput = (input) => {
    const modifiedInput = {}
    Object.values(input).forEach((item, index) => {
        modifiedInput[`Value${index + 1}`] = item
    })
    return modifiedInput
}

Use this function, pass your input and get your desired result

Answer 4

You can edit the array to have the values you need

    let i=0,j=0,unit1={};
    let unit = JSON.parse(body);
    let unit3=["val1","val2","val3","val4"]
    let unit5=Object.values(unit);
    for(let key in unit){
        unit1[unit3[i++]]=unit5[j++];
    }
    var unit2 = JSON.stringify(unit1)

console.log('Sales is 1 million metric tonnes \n' + unit2);
//Sales is 1 million metric tonnes 
//{"val1":"apple","val2":"bus","val3":"red","val4":"Name 1"}