Answer by tpikachu for Write to file in "appData" in Electron. Where to add import { app } from "electron";?

To get the app path at your main process. Then use this code at your main.js

switch(process.platform) {    case 'darwin': {      return path.join(process.env.HOME, 'Library', 'Application Support', ...);    }    case 'win32': {      return path.join(process.env.APPDATA, ...);    }    case 'linux': {      return path.join(process.env.HOME, ...);    }}

And going to get the path from the renderer then use this code at your renderer

const remote = require('electron').remote;const app = remote.app;console.log(app.getPath('userData'));

But to use require at your renderer, please make sure nodeintegration is true.

If I were you, I was going to get the app path at main process and store the file at main process as well.Hence, importing many dependencies at renderer process is not a good choice. The renderer process mainly takes care of showing your app in the Chromium browser.

So to make this operation at main process. Use this

at your main.js

  const { ipcMain } = require('electron')  const appPath = () => {    switch(process.platform) {      case 'darwin': {        return path.join(process.env.HOME, 'Library', 'Application Support');      }      case 'win32': {        return process.env.APPDATA;      }      case 'linux': {        return process.env.HOME;      }    }  }  const writeToFile = (fileName, inData) => {      const fullPath = path.join(appPath(), "\\", fileName);      fs.writeFile(fullPath, inData, (err) => {        // throws an error, you could also catch it here        if (err) throw err;        // success case, the file was saved        console.log('Lyric saved!');    });  } // write_to_file  ipcMain.on('WRITE_TEXT', async (event, arg) => {    writeToFile(arg.fileName, arg.inData)  });

At your renderer process add this code.

const {ipcRenderer} = require('electron')ipcRenderer.sendSync('WRITE_TEXT',{fileName, inData})

As you can see, at renderer process, this is sending the inp_data to your main process through 'WRITE_TEXT'IPC channel.

One more thing here, at your code. You are connecting your DB at your renderer and it's possible but this is not a right choice. Please think while you are having the several renderer. You should move this to main process too.