user1943674 user1943674 - 29 days ago 16
JSON Question

Removing JSON object from JSON file

I am trying to write a function that removes an object from a json file. The json file is formatted with an array of users as such:

{
"users": [
{
"username": "test1",
"answers": [
"Red",
"Blue",
"Yellow",
"Green"
]
},
{
"username": "test2",
"answers": [
"1",
"2",
"3",
"4"
]
}
]
}


The code I wrote is not working for some reason. I want to be able to just pass a variable "test2" into the function and then have that particular user removed from the object, including their answers.

var removeUser = user;
var data = fs.readFileSync('results.json');
var json = JSON.parse(data);
var users = json.users;

delete users.users[user];

fs.writeFileSync('results.json', JSON.stringify(json, null, 2));

Answer

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));