codesnips

signup

python 
from marshmallow import (
    Schema, fields, validates, validates_schema,
    ValidationError, RAISE,
)
from marshmallow.validate import Length, Email, Equal

Field-Level Signup Validation in Flask with Marshmallow Schemas

flask marshmallow validation
by codesnips 3 tabs
python 
import re

EMAIL_RE = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")


class SignupValidator:

Validate a Flask Signup Form and Collect Per-Field Errors

flask validation forms
by codesnips 4 tabs
javascript 
export const required = (msg = 'This field is required') => (value) =>
  value && value.trim() !== '' ? '' : msg;

export const minLength = (n, msg) => (value) =>
  value && value.length >= n ? '' : msg || `Must be at least ${n} characters`;

Field-by-Field Signup Validation with a Reusable useForm Hook in React

react hooks forms
by codesnips 4 tabs
go 
package validate

import (
	"regexp"
	"unicode/utf8"
)

Per-Field Signup Validation Errors With a Reusable Validator in Go

go validation http
by codesnips 2 tabs
php 
<?php

namespace App\Validator;

use Symfony\Component\Validator\Constraint;

Validate a Symfony Signup DTO With a Custom Constraint and Validator

symfony validation dto
by codesnips 4 tabs