# Form Handling Validation

> Manages user input, validation, and form submission handling in UI

- Skill: `digitalexplorers/form-handling-validation` (Agent Skill)
- Install (CLI): `npx skillmds@latest add digitalexplorers/form-handling-validation`
- Raw SKILL.md: https://api.skillmd.com/api/skills/digitalexplorers/form-handling-validation/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: DigitalExplorers (https://skillmd.com/u/digitalexplorers)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/digitalexplorers/form-handling-validation

---


## Provides

- Input validation rules
- Error messages for invalid fields
- Form submission handling
- Controlled form state management

## Use When

- Building login forms
- Signup/registration forms
- Data entry forms
- Any user input workflow

---

## Instructions

### 1. Initialize Form State

- Maintain `values` object for inputs
- Maintain `errors` object for validation errors
- Maintain `loading` state for submission

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### 2. Handle Input Changes

- Update form state on every input change
- Clear field-level errors when user edits

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### 3. Validate Input

- Validate required fields
- Validate formats (email, password rules)
- Return errors object

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### 4. Handle Form Submit

1. Validate all fields  
2. If errors exist → stop submission  
3. If valid → call API  
4. Handle success and failure  
5. Update loading state  

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## Standard Flow

```javascript
handleSubmit() {
  const errors = validate(values);

  if (Object.keys(errors).length > 0) {
    setErrors(errors);
    return;
  }

  submitForm(values);
}