Email validation with zero dependencies.

import { validateEmail } from '@isan3/checkemail';

const { confidence } = await validateEmail('john.doe+test@gmail.com');
console.log(confidence.status, confidence.canonical_email); // LIKELY johndoe@gmail.com

Node.js 18+ or Bun. TypeScript types included.

docker run -p 3000:3000 saiakashneela/checkemail

curl "http://localhost:3000/validate?email=john.doe%2Btest@gmail.com"

import requests

r = requests.get('http://localhost:3000/validate', params={'email': 'john@gmail.com'})
print(r.json()['confidence']['status'])

resp, err := http.Get("http://localhost:3000/validate?email=" + url.QueryEscape("john@gmail.com"))
if err != nil {
	log.Fatal(err)
}
defer resp.Body.Close()

var result map[string]any
json.NewDecoder(resp.Body).Decode(&result)
fmt.Println(result["confidence"])

using System.Net.Http.Json;
using System.Text.Json;

using var http = new HttpClient();
var result = await http.GetFromJsonAsync<JsonElement>(
    $"http://localhost:3000/validate?email={Uri.EscapeDataString("john@gmail.com")}");
Console.WriteLine(result.GetProperty("confidence").GetProperty("status"));

var email = URLEncoder.encode("john@gmail.com", StandardCharsets.UTF_8);
var request = HttpRequest.newBuilder()
    .uri(URI.create("http://localhost:3000/validate?email=" + email))
    .build();
var response = HttpClient.newHttpClient()
    .send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());

Endpoints: GET /validate?email= and GET /health. Port set by PORT (default 3000), CORS open for GET. Try it with this page: ?api=http://localhost:3000

git clone https://github.com/SaiAkashNeela/checkemail
cd checkemail
npx wrangler pages deploy website --project-name checkemail

The site is plain static files, so it runs free on Cloudflare Pages or any static host. The demo runs checkemail's checks in the visitor's browser and resolves DNS over HTTPS through 1.1.1.1. There is no server to run.