CaptchaNoJS protects ASP.NET/Core forms from spam, it's a self-hosted .NET library: no 3rd-party servers are involved in the generation, displaying, and validation of Captcha challenges.
// GET: Example/Create
public IActionResult Create()
{
Captcha captcha = new Captcha(200, 80, 6);
ViewData["b64"] = captcha.GenerateAsB64(); // or captcha.GenerateAsB64(Captcha.CaptchaType.Circle);
HttpContext.Session.SetString("captchaAnswer", captcha.GetAnswer());
return View();
}// POST: Example/Create
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(String captcha)
{
if (captcha == HttpContext.Session.GetString("captchaAnswer")) {
....
}
}<form asp-action="Create">
<div class="form-group">
<label for="Captcha"> Captcha </label>
<img src='data:image/Png;base64,@ViewData["b64"]' />
<input type="text" class="form-control" name="captcha" />
</div>
<div class="form-group">
<input type="submit" value="Save" class="btn btn-primary" />
</div>
</form>
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