Developer Documentation

Invisible bot protection. No CAPTCHAs. API-first.

Quickstart in 60 s Get Site Key

Quickstart

Install & Embed

Add the script and get a token

Verify on Server

Validate the token on your backend

Quick Test with cURL

Verify nonce from command line

# Verify Nonce
curl -X POST https://api.silentshield.io/v1/verify \
  -H "api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"nonce": "256ea6c63c3ccdd317e05cbc9ef0c659"}'

Frontend Integration

Add the client script with SRI and defer attributes

<!-- Add to <head> with SRI for security -->
(function () {
  var KEY = "YOUR_API_KEY";
  var SITE = location.hostname;
  var V = "2025.09.1";
  var s = document.createElement('script');
  s.src = "https://api.silentshield.io/client.js?k=" + encodeURIComponent(KEY)
    + "&v=" + encodeURIComponent(V)
    + "&site=" + encodeURIComponent(SITE);
  s.async = true;
  s.crossOrigin = "anonymous";
  document.head.appendChild(s);
})();

Security & Privacy

No cookies – fully cookieless operation
No PII collection – GDPR & CCPA compliant
EU hosting – all data stays in Europe
WCAG compliant – accessible to all users
CSP compatible – use with Content Security Policy:

Content-Security-Policy: script-src 'self' https://api.silentshield.io;

API Reference

API Version: 2025-10-01 · Base URL: https://api.silentshield.io

POST/v1/verify

Verify SilentShield Nonce

Request Headers:

AuthorizationBearer YOUR_API_KEY

Content-Typeapplication/json

Request Body:

tokenstringThe nonce to verify

Response:

Success (200):

{
  "ok": true,
  "verdict": "human",
  "confidence": 0.95,
  "request_nonce": "req_abc123"
}

Error:

{
  "ok": false,
  "verdict": "error",
  "confidence": 0,
  "request_nonce": "req_abc123",
  "error": "Invalid nonce"
}

Status Codes:

200Nonce successfully verified

400Invalid request (missing or incorrect nonce)

401Invalid API Key

429Rate limit exceeded (100 requests/min.)

500Internal Server Error

SDKs & Libraries

JavaScript ES6+

v1.0.1

npm i @forge12interactive/silentshield-sdk-js

import { SilentShield } from "@forge12interactive/silentshield-sdk-js";

const shield = new SilentShield({
  siteKey: 'your-site-key',
  debug: true
});

await shield.initialize();
const token = await shield.getToken();

GitHub NPM

TypeScript

v1.0.1

npm i @forge12interactive/silentshield-sdk-js

import { SilentShield, type SilentShieldConfig } from "@forge12interactive/silentshield-sdk-js";

const config: SilentShieldConfig = {
  siteKey: 'your-site-key',
  timeout: 10000
};

const shield = new SilentShield(config);
const token: string = await shield.getToken();

GitHub NPM

Node.js Backend

v1.0.1

npm i @forge12interactive/silentshield-sdk-js

import { SilentShieldBackend } from "@forge12interactive/silentshield-sdk-js";

const backend = new SilentShieldBackend('your-secret-key');

// Form verification
const result = await backend.verifyFormSubmission(formData);
if (result.isValid) {
  console.log('Human verified!', result.formData);
}

GitHub NPM

Vue.js

v1.0.1

npm i @forge12interactive/silentshield-sdk-js

import { SilentShield } from "@forge12interactive/silentshield-sdk-js";

export default {
  async mounted() {
    this.shield = new SilentShield({ siteKey: 'your-key' });
    await this.shield.initialize();
  },
  
  methods: {
    async handleSubmit() {
      const token = await this.shield.getToken();
      // Submit with token
    }
  }
};

GitHub NPM

React

v1.0.1

npm i @forge12interactive/silentshield-sdk-js

import { SilentShield } from "@forge12interactive/silentshield-sdk-js";
import { useEffect, useState } from 'react';

function MyForm() {
  const [shield, setShield] = useState(null);
  
  useEffect(() => {
    const init = async () => {
      const s = new SilentShield({ siteKey: 'your-key' });
      await s.initialize();
      setShield(s);
    };
    init();
  }, []);
  
  const handleSubmit = async (e) => {
    const token = await shield?.getToken();
    // Submit with token
  };
  
  return <form onSubmit={handleSubmit}>...</form>;
}

GitHub NPM

Resources

Help Center

Comprehensive documentation with getting started guides, integration tutorials, configuration references, and troubleshooting.

Open Help Center

Changelog

Stay up to date with the latest features, improvements, and fixes.

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