how to validate express js form
// 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});custom validator express validator
body("thumbnail_file").custom(async (value, { req }) => {
const thumbnailFile = req.files && req.files.thumbnail_file;
if (!thumbnailFile) {
return true;
} else if (Array.isArray(thumbnailFile)) {
throw new Error("Only one thumbnail file is allowed.");
}
if (
thumbnailFile.mimetype !== "image/png" &&
thumbnailFile.mimetype !== "image/jpg" &&
thumbnailFile.mimetype !== "image/jpeg"
) {
throw new Error(
"Only .png, .jpg and .jpeg image formats are allowed for thumbnail file."
);
}
}),Copyright © 2021 Codeinu
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