EPERM error while trying to read fullchain.pem - node.js

Question

I'm trying to host an HTTPS website with Node.js on my Windows 10 computer, but Node.js has suddenly stopped being able to read the fullchain.pem I obtained using Let's Encrypt's Certbot.
This is my Node.js code:
const fs = require("fs")
const https = require("https")
const FS_OPTIONS = {
encoding: "utf-8",
flag: "r",
}
const key = fs.readFileSync("C:/Certbot/live/subdomain.example.com/privkey.pem", FS_OPTIONS)
const cert = fs.readFileSync("C:/Certbot/live/subdomain.example.com/fullchain.pem", FS_OPTIONS)
https.createServer({ key, cert }, (req, res) => {
// do stuff...
}).listen(8888)
However, when I run it, I receive the following error:
Error: EPERM: operation not permitted, open 'C:/Certbot/live/subdomain.example.com/fullchain.pem'
at Object.openSync (fs.js:476:3)
at Object.readFileSync (fs.js:377:35)
at Object.<anonymous> (D:\Users\...\index.js:8:17)
at Module._compile (internal/modules/cjs/loader.js:1063:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
at internal/main/run_main_module.js:17:47 {
errno: -4048,
syscall: 'open',
code: 'EPERM',
path: 'C:/Certbot/live/subdomain.example.com/fullchain.pem'
}
The only way I can bypass this is by running as administrator, but this is very strange, as this was not required before.
How can I restore this to its previous behavior?

Answer 1

you just need to change the access rights of the folder and subfolders of : C:/Certbot
add access to the user running nodejs. for example following this :
https://v2cloud.com/tutorials/how-to-change-folder-permissions-on-windows-2016