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In Vue 3, bind form controls to reactive state with v-model, run explicit validation rules, and prevent submission until the form passes them. For a small form, plain Vue functions are enough; for larger or nested forms, choose a validation library such as vee-validate or Vuelidate. In every case, keep server-side validation authoritative and show accessible, field-specific feedback.
Start with a semantic form and reactive values
v-model synchronizes form controls with Vue state, but it does not decide whether a value is acceptable. The Vue forms guide describes it as a way to simplify manual value bindings and input listeners. Text inputs and textareas synchronize through value and input; checkboxes and radios use checked and change; selects use value and change. Modifiers adjust that synchronization: .lazy waits for change rather than input, .number attempts numeric casting, and .trim removes surrounding whitespace. None of these replaces required, format, cross-field, or server validation.
Use a real <form> and submit handler, and connect each label to its control with matching for and id attributes. Vue’s accessibility guidance recommends semantic form elements such as <form>, <label>, <input>, <textarea>, and <button>.
Validate a small Vue form without a library
This Vue 3 component validates a required email and a password of at least eight characters. It shows a field error after blur or the first submit attempt, blocks invalid submission, and places an error summary in an announced region. Replace the placeholder submit action with your API call.
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<script setup>
import { computed, reactive, ref } from 'vue'
const values = reactive({ email: '', password: '' })
const touched = reactive({ email: false, password: false })
const submitted = ref(false)
const status = ref('')
const errors = computed(() => ({
email: !values.email.trim()
? 'Enter your email address.'
: /^[^s@]+@[^s@]+.[^s@]+$/.test(values.email.trim())
? ''
: 'Enter an email address in the format name@example.com.',
password: values.password.length >= 8
? ''
: 'Use at least 8 characters for your password.'
}))
const visibleError = (field) =>
(touched[field] || submitted.value) ? errors.value[field] : ''
const isValid = computed(() =>
Object.values(errors.value).every((message) => !message)
)
async function submit() {
submitted.value = true
status.value = ''
if (!isValid.value) return
// Send values to your server here; validate them there as well.
status.value = 'The form passed client-side validation.'
}
</script>
<template>
<form novalidate @submit.prevent="submit">
<div>
<label for="email">Email</label>
<input
id="email"
v-model.trim="values.email"
type="email"
autocomplete="email"
:aria-invalid="Boolean(visibleError('email'))"
:aria-describedby="visibleError('email') ? 'email-error' : undefined"
@blur="touched.email = true"
>
<p v-if="visibleError('email')" id="email-error">
{{ visibleError('email') }}
</p>
</div>
<div>
<label for="password">Password</label>
<input
id="password"
v-model="values.password"
type="password"
autocomplete="new-password"
:aria-invalid="Boolean(visibleError('password'))"
:aria-describedby="visibleError('password') ? 'password-error' : undefined"
@blur="touched.password = true"
>
<p v-if="visibleError('password')" id="password-error">
{{ visibleError('password') }}
</p>
</div>
<p v-if="submitted && !isValid" role="alert">
Fix the errors above before submitting.
</p>
<p role="status">{{ status }}</p>
<button type="submit">Create account</button>
</form>
</template>The email expression here is a practical client-side format check, not a definitive test that an address exists or can receive mail. Likewise, the password rule is an example policy, not a universal security standard. Define rules from the needs of your product and enforce important constraints on the server.
Choose when errors appear
- On blur: the example marks a field touched when a visitor leaves it, so a pristine form does not start with errors.
- After the first submit:
submittedexposes all remaining errors, including fields the visitor has not visited. - On input: you can also validate as values change, but avoid making an error flash while someone is still typing. A common compromise is to show it after first blur and then update it as the user edits.
For a long form, add an error summary with links to invalid controls and move focus to the first invalid control after an unsuccessful submit. Keep each field’s error adjacent to its control and associate it using aria-describedby, as in the example. A visual error alone is not enough for people using assistive technology.
Choose between hand-written rules, Vuelidate, and vee-validate
| Approach | Rule style and form shape | Useful when | Trade-off |
|---|---|---|---|
| Plain Vue | Functions over reactive values; you decide how to organize nested data. | The form is small and its rules are straightforward. | You must implement error timing, touched state, pending state, reset, and submit behavior yourself. |
| Vuelidate Next | Model-centric validation tree that follows reactive state. | Rules naturally mirror a domain model, especially nested models or collections, and custom predicates are important. | You shape the rules and validation tree around your model rather than using a field/form schema-first workflow. |
| vee-validate v4 | Field and form primitives, or template components, with optional form-level schemas. | You want explicit field/form state, controlled submit and reset behavior, async rules, reusable schemas, or custom component integration. | It introduces library concepts and dependencies that may be unnecessary for a tiny form. |
Use Vuelidate for model-shaped validation
Vuelidate documents a lightweight, model-based and decoupled approach. Its Vue 3 path is Vuelidate Next, commonly used with Composition API and useVuelidate(). A rule object can use validators such as required and email. It also supports nested models, collection validations, contextual validators, composition, and custom predicates. Consider it when the validation structure should track a complex reactive model rather than a set of independently configured fields.
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Use vee-validate for field and schema workflows
vee-validate v4 is built around Vue 3 Composition API primitives including useForm and useField; its Form, Field, and ErrorMessage components offer a template-oriented alternative. Its documentation says it supports synchronous and asynchronous validation, with rules defined at field level or through form-level schemas. It also supports custom components through its composition functions.
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Choose vee-validate when you want explicit valid, dirty, touched, or pending state, reusable schemas, or built-in submit/reset flow. For example, its Yup integration can express a required email with yup.string().required().email() and a password minimum. The docs also describe Zod and Valibot integrations. Do not recreate a large schema on every render unless its rules genuinely depend on reactive values.
Stop invalid submissions and handle server errors
In hand-written Vue code, run the complete check inside the submit handler rather than relying on a disabled button or on validation that ran earlier. Values can change between an earlier check and submission. The native example does this by setting submitted, checking isValid, and returning before the submit action.
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vee-validate validates before calling the valid submit handler. Its submission guide says that, in most cases, fields should be valid before submission and that this is done by default. Use handleSubmit for JavaScript or AJAX submission, submitForm when you need native form submission while blocking invalid data, and validate when you want to run checks without submitting. Its documented flow also covers invalid-submit handling, touched and pending states, submit counts, and reset APIs.
- Initialize values and define field or schema rules.
- Choose whether each field validates on blur, input, or submit; use async validation only where a remote check is necessary.
- On submit, validate the whole form and expose errors for fields that have not yet been touched.
- When invalid, focus or announce the first problem and give a clear route to the affected field.
- When valid, submit to the server. Map server-returned field errors back to the matching controls and show non-field errors in an announced summary.
- After success, reset values and validation state only if that matches the flow—for example, do not erase a form when the user needs to correct a separate server-side problem.
An async client check can improve feedback, but it cannot make a uniqueness, authorization, or security decision trustworthy. A request may be stale, the network may fail, or another user may change the underlying data before submission. The server must validate the submitted values and return an error the interface can explain.
Use schemas and types where they reduce duplication
For a larger form, keep a Yup, Zod, or Valibot schema close to the form boundary and reuse the same rules where appropriate. vee-validate provides typed schema adapters such as @vee-validate/yup and @vee-validate/zod; its toTypedSchema adapter lets the library infer input and output types from schemas. That can help distinguish values as entered from parsed or transformed values. It does not make the browser’s data authoritative: the server still needs its own checks.
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Do not make one giant schema for unrelated forms simply to avoid writing field rules. A schema is most helpful when it is a coherent contract for a form, can be reused, or captures relationships among fields. Cross-field rules—for example, requiring a confirmation field to match a password—should be rerun when either related value changes, not only when the dependent field is first blurred.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test validation behavior, not just rule functions
For each form, check the interaction as well as the predicates. At minimum, verify that a blank submit is blocked, a valid submit reaches the handler, blur and submit reveal errors at the intended time, and correcting a value clears its message. Also cover reset, async waiting and failure states, server field errors, keyboard navigation, and screen-reader association between labels, controls, and messages.
Test boundary values such as whitespace-only input, the shortest permitted value, a value just below the minimum, and changes to one side of a cross-field rule. If you use .number, check the actual value type your handler receives; a binding modifier is a synchronization convenience, not a substitute for validating the accepted range or handling an empty value.
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Troubleshoot common Vue validation failures
- The form submits even though an error is visible: make the submit handler run the full current validation and return early on failure. Do not treat an error’s presence in the DOM or a disabled button as the enforcement mechanism.
- No error appears until too late: decide explicitly whether the field becomes touched on blur and whether the first submit reveals all errors. Check that the rendered error uses the same state and rule result as the submit handler.
- Errors stay after the value is fixed: ensure validation recomputes when the relevant value changes. For a cross-field constraint, changes to either participating field should trigger a new check.
- A remote check flickers or returns an old result: represent a pending state, avoid sending a request on every keystroke without a suitable delay, and prevent stale responses from replacing results for newer values. The final submit still needs server validation.
- Assistive technology does not identify the error: give the control a stable
id, point the label’sforto it, and connect the error witharia-describedby. Announce form-level feedback when appropriate rather than relying on color alone. - Nested or repeated fields become hard to maintain: choose a model-oriented validation tree or a field/form library that suits the actual data shape instead of copying predicates into many templates.
- Code written for an older Vue setup does not match current guidance: use Vue 3 as the baseline. Vue 2 support ended on December 31, 2023; Vuelidate’s Vue 3 path is Vuelidate Next, and the examples and library choices here are for Vue 3.
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Form validation belongs in your Vue application and on your server; a screenshot API does not replace either. If you also need a screenshot of the page for a visual check, ScreenshotNeo can capture a URL with one GET request. The example below uses its documented endpoint; see the ScreenshotNeo API docs for request options.
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Frequently Asked Questions
Can I use native HTML validation alongside Vue validation?
Yes. Decide deliberately whether browser-native validation or your Vue interface owns the feedback flow; mixing both can produce duplicate or inconsistent messages. The native Vue example uses novalidate so its own messages control that flow.
Does validating on the client make a form secure?
No. Client checks improve usability, but users can bypass them or alter requests. Enforce permissions and business rules on the server.
Quick Recap
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