#form-handling code explainers

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