Is there a method to prevent the json file from being constantly overwritten?

After running this code, I noticed that even when inputting a different userId, it still ends up overwriting the existing user instead of adding a new one as intended.

 const user = userId;
 const userObj = {[user]:valueX};
    words.users = userObj;
    fs.writeFileSync('words.json', JSON.stringify(words,null,2), finished);

The input is taken from here (readline-sync)

let userId = input.question('Enter yourUserId: ');

And of course, I am reading the file first

let words = JSON.parse(fs.readFileSync('words.json'));
javascriptjsonobject

Answer №1

let newUserObj = {[user]:valueX};
words.users = newUserObj;

When assigning an object to words.users, make sure it contains all existing users, not only the new one you are adding.

let updatedUserObj = {...words.users, [user]:valueX };

Answer №2

Based on the provided code snippet, it seems that words.users is being treated as an object.

if(!words.users) words.users = {};  // Ensure that words users are initialized
words.users[user] = valueY;

As a result, you will have a words.users object structured like this

{user3: valueY1, user4: valueY2}

You can then access it using

console.log(words.users[user3]); // valueY1

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