$.ajax({
       url: '/api/login',
       type: 'GET',
       dataType: 'json',
       ContentType: 'application/json',
       data: {formData},
       success: (data) => {
         console.log('SUCCESS')
         console.log(data)
         this.setState({
           isInProcess: false
         })
       },
       error: (jqXHR) => {
         console.log(jqXHR)
         console.log('ERROR')
         this.setState({isInProcess: false})
       }
    })

async function findUser(data) {
  try {
    const user = await User.findOne({email: data.email,
                                     password: data.password})
    console.log('User was found')
    return { user }
  } catch (err) {
    console.log('error', err)
    throw err
  }
}

app.get('/api/login', async (req, res) => {
  const data = req.query
  try {
    const foundUserData = await findUser(data.formData)
    return res.json(foundUserData)
  } catch (err) {
    return res.status(400).json(err)
  }
})