- Parse the JSON
const arr = JSON.parse(json);
- For each object in the JSON, rename the key:
obj.id = obj._id;
delete obj._id;
- Stringify the result
All together:
function renameKey ( obj, oldKey, newKey ) {
obj[newKey] = obj[oldKey];
delete obj[oldKey];
}
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 arr = JSON.parse(json);
arr.forEach( obj => renameKey( obj, '_id', 'id' ) );
const updatedJson = JSON.stringify( arr );
console.log( updatedJson );