Removing JSON object from JSON file
You can use filter to remove the user you do not want
var fs = require('fs');var removeUser = "test2";var data = fs.readFileSync('results.json');var json = JSON.parse(data);var users = json.users;json.users = users.filter((user) => { return user.username !== removeUser });fs.writeFileSync('results.json', JSON.stringify(json, null, 2));
Your users aren't keyed off of name, they're in a numerically indexed array. You have to use delete users.users[1], or better yet, use .splice().
If you want to delete based on username, you're going to have to loop through.
users.users.forEach((user, index) => { if (user.username === 'test2') { users.users.splice(index, 1); }});For anything much more complicated, consider a client-side database like TaffyDB.