Integration Examples

Overview

This guide provides integration examples for popular frameworks, platforms, and languages to help you get started with Fraudiant quickly.

Node.js / Express

Basic Integration

const express = require('express');
const fetch = require('node-fetch');

const app = express();
app.use(express.json());

const FRAUDIANT_API_KEY = process.env.FRAUDIANT_API_KEY;

// Middleware to validate email
async function validateEmail(req, res, next) {
  const { email } = req.body;

  if (!email) {
    return res.status(400).json({ error: 'Email is required' });
  }

  try {
    const response = await fetch(
      `https://api.fraudiant.com/email/${encodeURIComponent(email)}`,
      {
        headers: { 'Authorization': `Bearer ${FRAUDIANT_API_KEY}` }
      }
    );

    const validation = await response.json();

    if (validation.disposable || validation.spam) {
      return res.status(400).json({
        error: 'Please provide a valid, non-disposable email address'
      });
    }

    // Attach validation data to request
    req.emailValidation = validation;
    next();
  } catch (error) {
    console.error('Email validation error:', error);
    // Fail open - allow signup if validation service is down
    next();
  }
}

// Registration endpoint
app.post('/api/register', validateEmail, async (req, res) => {
  const { email, password } = req.body;

  // Email is validated, proceed with registration
  // Access validation data via req.emailValidation

  res.json({ success: true, message: 'User registered' });
});

app.listen(3000);

With Caching

const NodeCache = require('node-cache');
const cache = new NodeCache({ stdTTL: 86400 }); // Cache for 24 hours

async function validateEmailWithCache(email) {
  // Check cache first
  const cached = cache.get(email);
  if (cached) {
    return cached;
  }

  // Call API
  const response = await fetch(
    `https://api.fraudiant.com/email/${email}`,
    {
      headers: { 'Authorization': `Bearer ${process.env.FRAUDIANT_API_KEY}` }
    }
  );

  const validation = await response.json();

  // Store in cache
  cache.set(email, validation);

  return validation;
}

Next.js

API Route

// pages/api/validate-email.ts
import type { NextApiRequest, NextApiResponse } from 'next';

type ValidationResponse = {
  valid: boolean;
  message?: string;
  suggestion?: string;
};

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse<ValidationResponse>
) {
  if (req.method !== 'POST') {
    return res.status(405).json({ valid: false, message: 'Method not allowed' });
  }

  const { email } = req.body;

  if (!email) {
    return res.status(400).json({ valid: false, message: 'Email is required' });
  }

  try {
    const response = await fetch(
      `https://api.fraudiant.com/email/${encodeURIComponent(email)}`,
      {
        headers: {
          'Authorization': `Bearer ${process.env.FRAUDIANT_API_KEY}`
        }
      }
    );

    const validation = await response.json();

    // Check for typos
    if (validation.did_you_mean) {
      return res.json({
        valid: true,
        suggestion: validation.did_you_mean,
        message: `Did you mean ${validation.did_you_mean}?`
      });
    }

    // Validate email quality
    if (validation.disposable || validation.spam || !validation.mx) {
      return res.status(400).json({
        valid: false,
        message: 'Please provide a valid, non-disposable email address'
      });
    }

    res.json({ valid: true });
  } catch (error) {
    console.error('Validation error:', error);
    res.status(500).json({ valid: false, message: 'Validation service unavailable' });
  }
}

Client Component

// components/SignupForm.tsx
'use client';

import { useState } from 'react';

export default function SignupForm() {
  const [email, setEmail] = useState('');
  const [error, setError] = useState('');
  const [suggestion, setSuggestion] = useState('');

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');
    setSuggestion('');

    const response = await fetch('/api/validate-email', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ email })
    });

    const data = await response.json();

    if (data.suggestion) {
      setSuggestion(data.message);
      return;
    }

    if (!data.valid) {
      setError(data.message);
      return;
    }

    // Proceed with registration
    console.log('Email is valid, proceeding...');
  };

  return (
    <form onSubmit={handleSubmit}>
      <input
        type="email"
        value={email}
        onChange={(e) => setEmail(e.target.value)}
        placeholder="Enter your email"
        required
      />
      {error && <p className="error">{error}</p>}
      {suggestion && <p className="suggestion">{suggestion}</p>}
      <button type="submit">Sign Up</button>
    </form>
  );
}

Python / Django

Middleware

# middleware/email_validation.py
import requests
from django.conf import settings
from django.http import JsonResponse

class EmailValidationMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        return self.get_response(request)

    def process_view(self, request, view_func, view_args, view_kwargs):
        # Only validate on registration endpoints
        if request.path == '/api/register/' and request.method == 'POST':
            email = request.POST.get('email')

            if not email:
                return JsonResponse({'error': 'Email is required'}, status=400)

            validation = self.validate_email(email)

            if not validation['valid']:
                return JsonResponse(
                    {'error': validation['message']},
                    status=400
                )

            # Attach validation to request
            request.email_validation = validation['data']

        return None

    def validate_email(self, email):
        try:
            headers = {'Authorization': f'Bearer {settings.FRAUDIANT_API_KEY}'}
            response = requests.get(
                f'https://api.fraudiant.com/email/{email}',
                headers=headers,
                timeout=5
            )

            data = response.json()

            if data.get('disposable') or data.get('spam'):
                return {
                    'valid': False,
                    'message': 'Please provide a valid, non-disposable email address'
                }

            return {'valid': True, 'data': data}

        except Exception as e:
            print(f'Email validation error: {e}')
            # Fail open
            return {'valid': True, 'data': {}}

View Function

# views.py
from django.http import JsonResponse
from django.views.decorators.http import require_http_methods
import requests
from django.conf import settings

@require_http_methods(["POST"])
def register_user(request):
    email = request.POST.get('email')
    password = request.POST.get('password')

    # Validate with Fraudiant
    validation = validate_email(email)

    if not validation['valid']:
        return JsonResponse({'error': validation['message']}, status=400)

    # Proceed with registration
    # ... your registration logic ...

    return JsonResponse({'success': True})

def validate_email(email):
    headers = {'Authorization': f'Bearer {settings.FRAUDIANT_API_KEY}'}

    try:
        response = requests.get(
            f'https://api.fraudiant.com/email/{email}',
            headers=headers,
            timeout=5
        )

        data = response.json()

        if data.get('disposable') or data.get('spam') or not data.get('mx'):
            return {
                'valid': False,
                'message': 'Invalid or disposable email address'
            }

        return {'valid': True, 'data': data}

    except requests.exceptions.RequestException as e:
        print(f'Validation error: {e}')
        # Fail open in case of service issues
        return {'valid': True, 'data': {}}

PHP / Laravel

Service Class

<?php
// app/Services/EmailValidationService.php

namespace App\Services;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Cache;

class EmailValidationService
{
    private $apiKey;
    private $baseUrl = 'https://api.fraudiant.com';

    public function __construct()
    {
        $this->apiKey = config('services.fraudiant.api_key');
    }

    public function validate(string $email): array
    {
        // Check cache first
        $cacheKey = 'email_validation_' . md5($email);
        $cached = Cache::get($cacheKey);

        if ($cached) {
            return $cached;
        }

        try {
            $response = Http::withHeaders([
                'Authorization' => 'Bearer ' . $this->apiKey
            ])->get("{$this->baseUrl}/email/{$email}");

            $data = $response->json();

            $result = [
                'valid' => !($data['disposable'] ?? false) &&
                          !($data['spam'] ?? false) &&
                          ($data['mx'] ?? false),
                'data' => $data,
                'message' => $this->getValidationMessage($data)
            ];

            // Cache for 24 hours
            Cache::put($cacheKey, $result, now()->addDay());

            return $result;

        } catch (\Exception $e) {
            \Log::error('Email validation error: ' . $e->getMessage());

            // Fail open
            return ['valid' => true, 'data' => [], 'message' => null];
        }
    }

    private function getValidationMessage(array $data): ?string
    {
        if ($data['disposable'] ?? false) {
            return 'Disposable email addresses are not allowed';
        }

        if ($data['spam'] ?? false) {
            return 'This email domain is associated with spam';
        }

        if (!($data['mx'] ?? false)) {
            return 'Email domain cannot receive emails';
        }

        if ($data['did_you_mean'] ?? null) {
            return "Did you mean {$data['did_you_mean']}?";
        }

        return null;
    }
}

Controller

<?php
// app/Http/Controllers/AuthController.php

namespace App\Http\Controllers;

use App\Services\EmailValidationService;
use Illuminate\Http\Request;

class AuthController extends Controller
{
    private $emailValidator;

    public function __construct(EmailValidationService $emailValidator)
    {
        $this->emailValidator = $emailValidator;
    }

    public function register(Request $request)
    {
        $request->validate([
            'email' => 'required|email',
            'password' => 'required|min:8'
        ]);

        // Validate email with Fraudiant
        $validation = $this->emailValidator->validate($request->email);

        if (!$validation['valid']) {
            return response()->json([
                'error' => $validation['message']
            ], 400);
        }

        // Proceed with registration
        // ... your registration logic ...

        return response()->json(['success' => true]);
    }
}

Configuration

<?php
// config/services.php

return [
    // ... other services ...

    'fraudiant' => [
        'api_key' => env('FRAUDIANT_API_KEY'),
    ],
];

Ruby on Rails

Service Class

# app/services/email_validation_service.rb

class EmailValidationService
  BASE_URL = 'https://api.fraudiant.com'

  def initialize
    @api_key = ENV['FRAUDIANT_API_KEY']
  end

  def validate(email)
    # Check cache
    cache_key = "email_validation_#{Digest::MD5.hexdigest(email)}"
    cached = Rails.cache.read(cache_key)
    return cached if cached

    begin
      response = HTTParty.get(
        "#{BASE_URL}/email/#{URI.encode_www_form_component(email)}",
        headers: { 'Authorization' => "Bearer #{@api_key}" },
        timeout: 5
      )

      data = JSON.parse(response.body)

      result = {
        valid: !data['disposable'] && !data['spam'] && data['mx'],
        data: data,
        message: validation_message(data)
      }

      # Cache for 24 hours
      Rails.cache.write(cache_key, result, expires_in: 24.hours)

      result
    rescue => e
      Rails.logger.error("Email validation error: #{e.message}")
      # Fail open
      { valid: true, data: {}, message: nil }
    end
  end

  private

  def validation_message(data)
    return 'Disposable email addresses are not allowed' if data['disposable']
    return 'This email domain is associated with spam' if data['spam']
    return 'Email domain cannot receive emails' unless data['mx']
    return "Did you mean #{data['did_you_mean']}?" if data['did_you_mean']

    nil
  end
end

Controller

# app/controllers/registrations_controller.rb

class RegistrationsController < ApplicationController
  def create
    email = params[:email]
    validator = EmailValidationService.new
    validation = validator.validate(email)

    unless validation[:valid]
      render json: { error: validation[:message] }, status: :bad_request
      return
    end

    # Proceed with registration
    # ... your registration logic ...

    render json: { success: true }
  end
end

Go

package main

import (
    "encoding/json"
    "fmt"
    "io"
    "net/http"
    "os"
    "time"
)

type ValidationResponse struct {
    Status     int    `json:"status"`
    Email      string `json:"email"`
    Disposable bool   `json:"disposable"`
    Spam       bool   `json:"spam"`
    MX         bool   `json:"mx"`
}

type EmailValidator struct {
    apiKey  string
    baseURL string
    client  *http.Client
}

func NewEmailValidator() *EmailValidator {
    return &EmailValidator{
        apiKey:  os.Getenv("FRAUDIANT_API_KEY"),
        baseURL: "https://api.fraudiant.com",
        client:  &http.Client{Timeout: 5 * time.Second},
    }
}

func (v *EmailValidator) Validate(email string) (*ValidationResponse, error) {
    url := fmt.Sprintf("%s/email/%s", v.baseURL, email)

    req, err := http.NewRequest("GET", url, nil)
    if err != nil {
        return nil, err
    }

    req.Header.Add("Authorization", "Bearer "+v.apiKey)

    resp, err := v.client.Do(req)
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()

    body, err := io.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }

    var validation ValidationResponse
    if err := json.Unmarshal(body, &validation); err != nil {
        return nil, err
    }

    return &validation, nil
}

func (v *EmailValidator) IsValid(email string) (bool, error) {
    validation, err := v.Validate(email)
    if err != nil {
        return false, err
    }

    return !validation.Disposable && !validation.Spam && validation.MX, nil
}

// Usage in HTTP handler
func registerHandler(w http.ResponseWriter, r *http.Request) {
    email := r.FormValue("email")

    validator := NewEmailValidator()
    valid, err := validator.IsValid(email)

    if err != nil {
        http.Error(w, "Validation service unavailable", http.StatusServiceUnavailable)
        return
    }

    if !valid {
        http.Error(w, "Invalid or disposable email address", http.StatusBadRequest)
        return
    }

    // Proceed with registration
    w.WriteHeader(http.StatusOK)
    json.NewEncoder(w).Encode(map[string]bool{"success": true})
}

Best Practices

Always implement caching

Cache validation results for 24-48 hours to reduce API calls and improve performance.

Fail open on errors

If the Fraudiant API is unavailable, allow users to proceed rather than blocking them completely.

Use environment variables

Never hardcode API keys. Use environment variables or secret management systems.

Implement rate limit handling

Handle 429 responses gracefully with exponential backoff.

Validate server-side

Always validate on the server, never trust client-side validation alone.

Next Steps

Use Cases

Explore common implementation patterns

Best Practices

Learn optimization strategies

API Reference

Complete API documentation

Error Handling

Handle errors gracefully

Getting Started

Guides

Integration Examples

Overview

Node.js / Express

Basic Integration

With Caching

Next.js

API Route

Client Component

Python / Django

Middleware

View Function

PHP / Laravel

Service Class

Controller

Configuration

Ruby on Rails

Service Class

Controller

Go

Best Practices

Next Steps

Use Cases

Best Practices

API Reference

Error Handling

Getting Started

Guides

​Overview

​Node.js / Express

​Basic Integration

​With Caching

​Next.js

​API Route

​Client Component

​Python / Django

​Middleware

​View Function

​PHP / Laravel

​Service Class

​Controller

​Configuration

​Ruby on Rails

​Service Class

​Controller

​Go

​Best Practices

​Next Steps

Use Cases

Best Practices

API Reference

Error Handling

Overview

Node.js / Express

Basic Integration

With Caching

Next.js

API Route

Client Component

Python / Django

Middleware

View Function

PHP / Laravel

Service Class

Controller

Configuration

Ruby on Rails

Service Class

Controller

Go

Best Practices

Next Steps