How to remove a Key from a JSON

From ES6 you can use the Array.prototype.map() using "Destructuring Assignment" along with " Spread syntax " to delete the attributes you want to remove:

const nova = lista.map(({ remover, ...outros }) => outros);

Applying to your example:

const lista = [
  {"id": 1, "preco": 100, "detalhe": "nenhum"},
  {"id": 2, "preco": 150, "detalhe": "todos"},
  {"id": 3, "preco": 200, "detalhe": "alguns"},
];

const nova = lista.map(({ detalhe, ...demais }) => demais);

console.log('Original:', JSON.stringify(lista));
console.log('Resultado:', JSON.stringify(nova));

  

Assignment via destructuring assignment .

     

The destructuring assignment syntax is a JavaScript expression that enables you to extract data from arrays or objects into distinct variables.

var a, b, rest;
[a, b] = [1, 2];
console.log(a); // 1
console.log(b); // 2

[a, b, ...rest] = [1, 2, 3, 4, 5];
console.log(a); // 1
console.log(b); // 2
console.log(rest); // [3, 4, 5]

({a, b} = {a:1, b:2});
console.log(a); // 1
console.log(b); // 2

  

Syntax of Spread syntax .

     

Spread syntax allows an iterative object such as an array expression or a string to be expanded where zero or more arguments (for function calls) or elements (for literal arrays) are expected, or an object is expanded where zero or more property: value pairs (for literal objects) are expected.

function sum(x, y, z) {
  return x + y + z;
}

const numbers = [1, 2, 3];

console.log(sum(...numbers));
// expected output: 6

console.log(sum.apply(null, numbers));
// expected output: 6

  

Array.prototype.map () .

     The map () method invokes the callback function passed by argument for each Array element and returns a new Array as a result.

var numbers = [1, 4, 9];
var roots = numbers.map(Math.sqrt);
// roots é [1, 2, 3], numbers ainda é [1, 4, 9]

In javascript you could do the following, assuming the following code:

let meuObjeto = {"id": 1, "preco": 100, "detalhe": "nenhum"}

delete meuObjeto.detalhe

Or

delete meuObjeto["detalhe"]

Now if you are a array with 100 of these objects, just do a repeat loop using one of the ways success is!

The following is an example, considering that meuArray is a Array with 100 objects of the type shown above.

meuArray.forEach(elemento => delete elemento.detalhe) // Ou da outra forma