#form-handling code explainers

java

@Controller
@RequestMapping("/employees")
public class EmployeeController {

Building a Spring MVC form controller

mvc form-handling validation

Intermediate 8 steps

javascript

'use server'
 
import { z } from 'zod'
import { revalidatePath } from 'next/cache'

Handling form submits with Next.js Server Actions

server-actions validation form-handling

Intermediate 7 steps

ruby

class ProjectsController < ApplicationController
  def new
    @project = current_account.projects.build
    load_form_collections

The new/create pattern in a Rails controller

mvc strong-parameters tenant-scoping

Intermediate 7 steps

typescript

type NestedValue = string | NestedValue[] | { [key: string]: NestedValue };
 
function parseFieldPath(name: string): string[] {
  const match = name.match(/^([^\[\]]+)((?:\[[^\[\]]*\])*)$/);

Parsing bracketed form field names into nested objects

parsing recursive-types regex

Intermediate 8 steps

javascript

function validateSignup({ email, password, confirmPassword, username, age }) {
  const errors = {};
 
  if (!email) {

Building a signup validator in JavaScript

validation regex guard-clauses

Beginner 7 steps

javascript

'use server'
 
import { revalidatePath } from 'next/cache'
import { redirect } from 'next/navigation'

How a Next.js Server Action updates a post

server-actions authorization validation

Intermediate 7 steps