How to rename JSON key

Question

I have a JSON object with the following content:

[
  {
    \"_id\":\"5078c3a803ff4197dc81fbfb\",
    \"email\":\"user1@gmail.com\",
    \"image\":\"some_imag         


        

Answer 1

JSON.parse has two parameters. The second parameter, reviver, is a transform function that can be formatted output format we want. See ECMA specification here.

In reviver function:

• if we return undefined, the original property will be deleted.
• this is the object containing the property being processed as this function, and the property name as a string, the property value as arguments of this function.

const json = '[{"_id":"5078c3a803ff4197dc81fbfb","email":"user1@gmail.com","image":"some_image_url","name":"Name 1"},{"_id":"5078c3a803ff4197dc81fbfc","email":"user2@gmail.com","image":"some_image_url","name":"Name 2"}]';

const obj = JSON.parse(json, function(k, v) {
    if (k === "_id") {
        this.id = v;
        return; # if return  undefined, orignal property will be removed
    }
    return v;
});

const res = JSON.stringify(obj);
console.log(res)

output:

[{"email":"user1@gmail.com","image":"some_image_url","name":"Name 1","id":"5078c3a803ff4197dc81fbfb"},{"email":"user2@gmail.com","image":"some_image_url","name":"Name 2","id":"5078c3a803ff4197dc81fbfc"}]