Validate Emails at Signup Before They Enter
Integrate ValidoAPI directly into your signup forms for inline real-time validation. Catch typos, disposable emails, and invalid addresses the moment users type — with sub-150ms API responses that users never notice.
Key Benefits
Sub-150ms API response times — invisible in-form validation with no UX lag
Catches typos in real-time: gmial.com → Did you mean gmail.com?
Blocks disposable email services before they reach your database
Shows instant inline feedback: valid, invalid, or suspicious label
Reduces form abandonment by helping users fix typos before submitting
Configurable debounce: validate on keypress, on blur, or on submit
Works in any frontend stack: React, Vue, Angular, vanilla JS, or backend
CORS-enabled endpoints for direct frontend integration
Use Cases
SaaS Signup & Onboarding
Validate email before account creation. Block disposables, catch typos, and ensure every new user can receive your activation email.
Lead Capture Forms
Validate emails in landing page forms, pop-ups, and lead magnets. Ensure your lead gen ads produce real, contactable leads.
eCommerce Checkout
Validate customer email at checkout without disrupting the purchase flow. Ensure order confirmation and shipping notifications are delivered.
Newsletter Subscribe Widgets
Validate subscriber email before inserting into your ESP. Keep your newsletter list clean from the very first subscription.
Contact & Demo Request Forms
Ensure inbound contact form submissions come from real email addresses before routing to your sales team or CRM.
Mobile App Registration
Use our API from your mobile backend (iOS/Android) to validate emails at app signup. Works with any server-side language.
Example API Response
// Inline validation with suggestion
{
"email": "user@gmial.com",
"status": "invalid",
"score": 5,
"checks": {
"syntax": true,
"domain": false,
"mx_record": false,
"smtp": false,
"disposable": false
},
"suggestion": "user@gmail.com",
"reason": "domain_not_found",
"response_time_ms": 28
}Frequently Asked Questions
How do I integrate real-time validation into a signup form?
Add an API call to your form's onBlur or onChange handler with a 500ms debounce. When ValidoAPI returns a result, show an inline success or error message. Check our docs for React, Vue, and vanilla JS examples.
Does ValidoAPI suggest corrections for typos?
Yes. When an email contains a common domain typo (like gmial.com), ValidoAPI returns a suggestion field with the most likely correct domain (like gmail.com).
Will real-time validation slow down my form?
No. ValidoAPI responds in under 150ms on average, which is well below the 200–300ms human perception threshold. Users will not notice any lag in form validation.
Can I call the API directly from my frontend JavaScript?
Yes. Our validation endpoint is CORS-enabled for approved domains. We recommend calling from your backend in production to keep your API key secure, but frontend calls are supported for prototyping.
Should I validate on keypress or on form submit?
We recommend validating on blur (when user leaves the field) with a 500ms debounce if validating as they type. Always perform a final validation on form submit to catch any changes made after initial validation.
Related Services
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Free plan includes 200 validations/month. No credit card required.
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