Vue Form Validation

Validating Forms

Validate on submit and optionally on blur. Surface field errors clearly.

Schema libraries (Zod/Yup) plus VeeValidate are common at scale.

const errors = ref({})
function validate() {
  errors.value = {}
  if (!email.value.includes('@')) errors.value.email = 'Invalid email'
  return Object.keys(errors.value).length === 0
}

Manual validation sketch with refs.

UX

inline errors, aria-describedby, focus first invalid

• Prefer Composition API + script setup.
• Use computed for derived UI.
• Keep side effects intentional.
• Practice in a small Vite app.

Vue Form Validation Cheatsheet

Quick reference for patterns covered in this lesson.

Server Errors

Map API field errors back into the same dictionary.

Common Mistakes

• Only CSS :invalid UX.
• Blocking without messages.

Key Takeaways

• Vue Form Validation is important in Vue apps.
• Practice in SFCs.
• Prefer clear naming.
• Check Vue docs for details.