Update multiple JSON files in Node.js - php

Question

Updated see below
I am in the process of creating a Mock API in Node.js. I have 3 files located in my apps json folder that the values token, id and session need to be updated all with the same key.
Here is an example of the 3 files. /json/standardsession.json
{ "token": "this needs manual edited value", "session": { "dlt": true, "start": 5280000, "end": 6000000 },
/json/session.json { "token": "this needs to be same value", "id": "this needs to be same value as token", "warning": "", "resident": { "id": 180161922, "resident_id": 264257672, "name": "John doe", "active": true,
},
/json/start.json
{ "code": 5, "error": null, "session": { "session_id": "this needs to be same value", "start_time": "2022-03-22T15:50:42.000Z", "status": 3 } }
How would I write a function that would update all 3 files with my set value in there respective places but not update all the other keys with the same ID like shown in sessions.json file above with the ID field also showing in residents. That doesn't get updated.
Is is possible to make a form that I can input the value into instead of a function that would update all 3 files with me manually inputting the data I want in it?
Both form and function help would be greatly appricated.
Thank you
Update:
After a few changes to code. I now get the following error. My code is posted below.
undefined:1
[object Object]
SyntaxError: Unexpected token o in JSON at position 1
const fs = require("fs")
//provide this function with a dictionary like
// give it your manual token value
function updateToken(token){
let rawdata = fs.readFileSync('json/standardsession.json');
let obj = JSON.parse(rawdata);
obj.token = token
fs.fileWrite('json/standardsession.json', obj, '')
let rawdata2 = fs.readFileSync('json/session.json');
let obj2 = JSON.parse(rawdata2);
obj2.token = token
obj2.id = token
fs.fileWrite('json/session.json', obj, '')
let rawdata3 = fs.readFileSync('json/start.json');
let obj3 = JSON.parse(rawdata3);
obj3.session.session_id = token
fs.fileWrite('json/start.json', obj, '')
}

Answer 1

You most likely want to create a function in your app.js code.
Let me know if I have misunderstood your question but this is the function I wrote for you below:
const fs = require("fs")
//provide this function with a dictionary like
// give it your manual token value
function updateToken(token){
let rawdata = fs.readFileSync(../json/standardsession.json);
let obj = JSON.parse(rawdata);
obj.token = token
fs.fileWrite(../json/standardsession.json, obj)
let rawdata = fs.readFileSync(../json/session.json);
let obj = JSON.parse(rawdata);
obj.token = token
obj.id = token
fs.fileWrite(../json/session.json, obj)
let rawdata = fs.readFileSync(../json/start.json);
let obj = JSON.parse(rawdata);
obj.session.session_id = token
fs.fileWrite(../json/start.json, obj)
}
}
Then to call this function to update your JSONs in code.
Write:
updateToken('my new token value');