server.js

const dbFile = 'db.json';
const keyJWT = 'secret';
const jsonServer = require('json-server');
const jwt = require('jsonwebtoken');
const server = jsonServer.create();
const router = jsonServer.router(dbFile);
const middlewares = jsonServer.defaults();

server.use(middlewares)
server.use(jsonServer.bodyParser)

server.post('/login', (req, res) => {
  let email = req.body.email;
  let password = req.body.password;
  let usuarios = router.db.get('users').value();
  let findUser = false;

  usuarios.forEach( usuario =>{
    if( email == usuario.email && password == usuario.password ){
      findUser = true;
      const token = jwt.sign(usuario, keyJWT , {expiresIn: 1000000});
      res.jsonp({token:token, id:usuario.id})
    }
  });

  if(!findUser){
    res.sendStatus(401);
  }

})

server.post('/admin', (req, res) => {
    let email = req.body.email;
    let password = req.body.password;
    let admins = router.db.get('admins').value();
    let findAdmin = false;

    admins.forEach( admin =>{
      if( email == admin.email && password == admin.password ){
        findAdmin = true;
        const token = jwt.sign(admin, keyJWT , {expiresIn: 1000000});
        res.jsonp({token:token})
      }
    });

    if(!findAdmin){
      res.sendStatus(401);
    }

  })

server.use(jsonServer.bodyParser)
server.use((req, res, next) => {
  if (req.method === 'POST') {
    req.body.createdAt = Date.now()
  }
  next()
})

server.use(router)
server.listen(3001, () => {
  console.log('JSON Server is running')
})