Email validation widget for sign-up forms

<script src="https://simpleverifier.com/widget.js" defer></script>

<input type="email" name="email" required data-simpleverifier>

// Check any value yourself
SimpleVerifier.check("jane@gmial.com");
// → { code: "typo", email: "jane@gmial.com", suggestion: "jane@gmail.com" }

// Attach to a field added later (fields added to the page are picked up automatically)
SimpleVerifier.attach(document.querySelector("#email"), { block: ["disposable", "role"], badge: false });

// React to results, e.g. to disable your own submit button
document.addEventListener("simpleverifier:check", (e) => {
  console.log(e.detail.code, e.detail.blocking); // ok | empty | syntax | typo | disposable | role
});

// npm i express   ·   SIMPLEVERIFIER_KEY stays on your server
app.post("/signup", async (req, res) => {
  const email = String(req.body.email || "").trim();
  let status = "unknown";
  try {
    const r = await fetch(
      "https://simpleverifier.com/api/v1/verify?email=" + encodeURIComponent(email),
      { headers: { Authorization: `Bearer ${process.env.SIMPLEVERIFIER_KEY}` },
        signal: AbortSignal.timeout(10000) }
    );
    if (r.ok) status = (await r.json()).status; // valid | risky | invalid
  } catch {
    // Timeout or network error: let the sign-up through rather than lose it.
  }
  if (status === "invalid") {
    return res.status(422).json({ error: "That email address can't receive mail." });
  }
  // ...create the account
});

<?php
// SIMPLEVERIFIER_KEY stays on your server
$email = trim($_POST['email'] ?? '');
$ch = curl_init('https://simpleverifier.com/api/v1/verify?email=' . urlencode($email));
curl_setopt_array($ch, [
    CURLOPT_HTTPHEADER => ['Authorization: Bearer ' . getenv('SIMPLEVERIFIER_KEY')],
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_TIMEOUT => 10,
]);
$body = curl_exec($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

$status = ($body !== false && $code === 200) ? (json_decode($body, true)['status'] ?? 'unknown') : 'unknown';
if ($status === 'invalid') {
    http_response_code(422);
    exit(json_encode(['error' => "That email address can't receive mail."]));
}
// ...create the account

# pip install flask requests   ·   SIMPLEVERIFIER_KEY stays on your server
import os, requests
from flask import Flask, request, jsonify

app = Flask(__name__)

@app.post("/signup")
def signup():
    email = (request.form.get("email") or "").strip()
    status = "unknown"
    try:
        r = requests.get(
            "https://simpleverifier.com/api/v1/verify",
            params={"email": email},
            headers={"Authorization": f"Bearer {os.environ['SIMPLEVERIFIER_KEY']}"},
            timeout=10,
        )
        if r.ok:
            status = r.json().get("status", "unknown")  # valid | risky | invalid
    except requests.RequestException:
        pass  # let the sign-up through rather than lose it
    if status == "invalid":
        return jsonify(error="That email address can't receive mail."), 422
    # ...create the account