Electron Fiddle Gist

index.html

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main.js

const { app, session } = require('electron');

async function testCookies() {

  const name = 'foo'
  const url = "/"
  const cookies = session.defaultSession.cookies
  const cookie = {
    url,
    name,
    value: 'Hello World!',
    expirationDate: 99999999999999999999
  }
  await cookies.set(cookie)

  // Query all cookies.
  const addedRes = await cookies.get({})

  console.log("Added", addedRes)

  await cookies.remove(url, name)

  const removedRes = await cookies.get({})

  console.log("Removed", removedRes)
}

//....
app.on('ready', () => {
  testCookies()
})

renderer.js

// Empty