How to rename JSON key

Question

I have a JSON object with the following content:

[   {     "_id":"5078c3a803ff4197dc81fbfb",     "email":"[email protected]",     "image":"some_image_url",     "name":"Name 1"   },   {     "_id":"5078c3a803ff4197dc81fbfc",     "email":"[email protected]",     "image":"some_image_url",     "name":"Name 2"   } ] 

I want to change the "_id" key to "id" so it would become

[   {     "id":"5078c3a803ff4197dc81fbfb",     "email":"[email protected]",     "image":"some_image_url",     "name":"Name 1"   },   {     "id":"5078c3a803ff4197dc81fbfc",     "email":"[email protected]",     "image":"some_image_url",     "name":"Name 2"   } ] 

How would I do that either with Javascript, jQuery or Ruby, Rails?

Thanks.

Answer 1

1. Parse the JSON

const arr = JSON.parse(json); 

2. For each object in the JSON, rename the key:

obj.id = obj._id; delete obj._id; 

3. Stringify the result

All together:

function renameKey ( obj, oldKey, newKey ) {   obj[newKey] = obj[oldKey];   delete obj[oldKey]; }  const json = `   [     {       "_id":"5078c3a803ff4197dc81fbfb",       "email":"[email protected]",       "image":"some_image_url",       "name":"Name 1"     },     {       "_id":"5078c3a803ff4197dc81fbfc",       "email":"[email protected]",       "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 );