node.js - login using passport always get error 400 bad request -

hi i'm using express implements passport, don't knows when i'm hit login url error 400 bad request. code :

main.js :

var express = require('express'); var app = express();  require('./config/passport'); require('./config/static')(app, express); require('./config/routes')(app); require('./config/seed')();  app.listen(3000, function () {   console.log('example app listening on port 3000!'); }); 

passport.js :

var passport = require('passport'); var user = require('../api/model/user.model'); var localstrategy = require('passport-local').strategy;  passport.use(new localstrategy({     usernamefield: 'email',     passwordfield: 'password'   },   function(username, password, done) {     user.findone({ username: username }, function (err, user) {       if (err) { return done(err); }       if (!user) { return done(null, false); }       if (!user.verifypassword(password)) { return done(null, false); }       return done(null, user);     });   } ));  passport.serializeuser(function(user, done) {   done(null, user.id); });  passport.deserializeuser(function(id, done) {   user.findbyid(id, function (err, user) {     done(err, user);   }); }); 

routes.js :

var passport = require('passport');  module.exports = function (app) {     app.post('/api/sign_in', passport.authenticate('local'), function (req, res) {     res.json(res.body);     });      app.get('/', function (req, res) {       res.sendfile(path.resolve(__dirname + '/../public/index.html'));     }); }; 

and when i'm hit url "/api/sign_in" 'post' method parameter '{email: "john@local.com", password: "12345"}', i'm error bad request 400