How to generate a nested array of objects from an source json object

Question

Using the value from an array of object I'm trying to generate an another array of objects with a different structure than that of the original array.

In the following example arrays you can see that from the key:value pairs the key is changing between the Source array and Result array but the values are same. I had tried some code but not worthwhile to share. What logic or method can be used in this case to generate the object structure mentioned below

Source array

[
 {
 "node": {
 "Charecter": "Hulk",
 "Publisher": "Marvel",
 "Movie": "Avengers"
 }
 },
 {
 "node": {
 "Charecter": "Wolverine",
 "Publisher": "Marvel",
 "Movie": "X-Men"
 }
 },
 {
 "node": {
 "Charecter": "Superman",
 "Publisher": "DC",
 "Movie": "Man of steel"
 }
 }
]

Result array

[
 {
 "Franchise": "Marvel",
 "Data": [
 {
 "Lead": "Hulk",
 "In": "Avengers"
 },
 {
 "Lead": "Wolverine",
 "In": "X-Men"
 }
 ]
 },
 {
 "Franchise": "DC",
 "Data": [
 {
 "Lead": "Superman",
 "In": "Man of steer"
 }
 ]
 },
]

Answer 1

Using .reduce() and .find() combination you can achieve the goal.

Try the following:

const data = [{ "node": { "Charecter": "Hulk", "Publisher": "Marvel", "Movie": "Avengers" } }, { "node": { "Charecter": "Wolverine","Publisher": "Marvel","Movie": "X-Men" } }, {"node": { "Charecter": "Superman", "Publisher": "DC","Movie": "Man of steel" } }];
const result = data.reduce((a, c) => {
 const found = a.find(e => e.Franchise === c.node.Publisher);
 
 if (found) found.Data.push({ Lead: c.node.Charecter, In: c.node.Movie });
 else a.push({ Franchise: c.node.Publisher, Data: [{ Lead: c.node.Charecter, In: c.node.Movie }] });
 return a;
}, []);
console.log(result)

I hope this helps!

• Lalas M: That was the straight answer .. Thanks it works fine

Answer 2

You can do it with Array#reduce method where group everything within an object and extract object values using Object.values method.

const data = [{"node":{"Charecter":"Hulk","Publisher":"Marvel","Movie":"Avengers"}},{"node":{"Charecter":"Wolverine","Publisher":"Marvel","Movie":"X-Men"}},{"node":{"Charecter":"Superman","Publisher":"DC","Movie":"Man of steel"}}]"
const result = Object.values(data.reduce((obj, { node: { Publisher: p, ...rest }}) => {
 // define key if not defined
 obj[p] = obj[p] || { Franchise: p, Data: [] };
 // push to the array
 obj[p].Data.push(rest);
 return obj;
}, {}));
console.log(result)