Is it possible to modify an array located on a JSON file?

Question

I'm attempting to make a command that will store an array of strings, and because I don't like to do have the chance of losing everything due to the process restarting, I've decided to use a JSON file array. So far, I've been able to write to the file and add array. However, my roadblock is attempting to modify that array and have the file update with it. Whenever I attempt to .push to the array, it does add the string, just not to the file. So I pose the question: Is it possible to modify an array, located in a JSON file? Snippets of code are below

const database = require('../../characters.json')

const charArray = database[message.author.id]
switch(args[0].toLowerCase()) {
  case "add":
    charArray.push(`${args.slice(1).join(" ")}`)
    break;
  case "view":
    // This code works
  case "remove":
    let pos = charArray.indexOf(`${args.slice(1).join(" ")}`)
    charArray.splice(pos, 1)
    break;
  default:
    // This code works
}

I think you should write the changes to the file stackoverflow.com/questions/36856232/… — Izzy Engelbert
– Izzy Engelbert, Commented Nov 23, 2020 at 3:14
@IzzyEngelbert I believe that is the basis of Harshana Smith's answer — Hibiscus
– Hibiscus, Commented Nov 23, 2020 at 19:02

Harshana · Accepted Answer · 2020-11-23 03:15:47Z

2

You have to write into the JSON file in order to modify the array inside it. For that, you can use NodeJS fs library. Check the code below:

const fs = require('fs');
const database = require('../../characters.json')

const charArray = database[message.author.id]
switch(args[0].toLowerCase()) {
  case "add":
    charArray.push(`${args.slice(1).join(" ")}`)
    database[message.author.id] = charArray;
    fs.writeFileSync('../../characters.json', JSON.stringify(database));
    break;
  case "view":
    // This code works
  case "remove":
    let pos = charArray.indexOf(`${args.slice(1).join(" ")}`)
    charArray.splice(pos, 1)
    break;
  default:
    // This code works
}

answered Nov 23, 2020 at 3:15

Harshana

5,5561 gold badge22 silver badges30 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Hibiscus Over a year ago

I assume for remove, I do the same fs.writeFileSync code?

Harshana Over a year ago

Yes. You have to do that

kigiri · Accepted Answer · 2020-11-23 03:14:41Z

0

You will have to rewrite your whole json file everytime you do a mutation.

answered Nov 23, 2020 at 3:14

kigiri

3,45824 silver badges26 bronze badges

Collectives™ on Stack Overflow

Is it possible to modify an array located on a JSON file?

2 Answers 2

2 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related