bagaimana memvalidasi formulir js ekspres

// Validation rules.var loginValidate = [  check('username', 'Username Must Be an Email Address').isEmail(),  check('password').isLength({ min: 8 })  .withMessage('Password Must Be at Least 8 Characters')  .matches('[0-9]').withMessage('Password Must Contain a Number')  .matches('[A-Z]').withMessage('Password Must Contain an Uppercase Letter')];// Process user input.app.post('/login', loginValidate, (req, res) => {  // Insert Login Code Here});
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