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ContactLint integrations

Each guide shows where the check belongs in that platform, the full code or settings, how to handle each verdict and typo suggestion, and how to test it. Every guide uses the same REST API and key, so you can switch platforms later without changing plans.

• Next.js: Validate Emails in Next.js Signup Forms (Route Handler and Server Action)
• Express: Validate Emails in Express with a ContactLint Middleware
• Django: Validate Emails in a Django Form clean_email Method
• FastAPI: Validate Emails in FastAPI with a ContactLint Dependency
• Laravel: Validate Signup Emails in Laravel With a Custom Rule
• Ruby on Rails: Validate Signup Emails in Rails With a Custom Validator
• Supabase: Validate Emails Before supabase.auth.signUp
• Firebase Authentication: Validate Email Addresses in Firebase Authentication Signups
• WordPress: Validate Emails in WordPress Forms With ContactLint
• Webflow: Validate Emails in Webflow Forms With ContactLint
• Zapier: Validate Emails in Zapier Zaps With ContactLint
• Make: Validate Emails in Make Scenarios With ContactLint
• n8n: Validate Emails in n8n Workflows With ContactLint

Prefer a drop-in script for the browser? See the typo widget. Building an AI agent? See the MCP server guide.

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