TrustCaptcha – Bot protection

Go CAPTCHA Integration

Use TrustCaptcha's Go CAPTCHA integration to secure your Go backend in minutes: add the widget to forms, then verify requests in your Go API and act on the bot-risk score. Stop signup, contact and checkout abuse without annoying puzzles. EU-hosted and GDPR-ready.

Quickstart

How the integration works

1. Create a CAPTCHA

Create a user account or log in with an existing one. Then create a new CAPTCHA or select an existing one. If you’re unsure whether TrustCaptcha is right for you, try our CAPTCHA service risk-free for 14 days at no cost.

On the CAPTCHA overview page, you will find all the important information, such as the site key, secret key and licence key. Allow your websites to access your CAPTCHA by simply adding them to the access authorised domain list in the CAPTCHA security rules.

CAPTCHA security rules of a demo CAPTCHA.

2. Integrate the CAPTCHA widget into your frontend

Integrate the CAPTCHA widget into your website or app. For precise, detailed instructions, please read the CAPTCHA widget guide in our documentation.

Read the documentation

The CAPTCHA widget will then be displayed on your website or app:

Prebuild frontend integrations
You can use one of our pre-built frontend integrations to integrate the CAPTCHA widget into your website or application. If there is no pre-built integration from us for your preferred frontend technology, your software developers can integrate the CAPTCHA themselves using using our documentation or ask our support-team for a pre-built integration solution.

3. Validate the CAPTCHA result in your backend

The following steps give you an idea of how to retrieve the CAPTCHA verification result from our server in a Go backend and determine how to proceed based on this result. For precise, detailed instructions, please read the CAPTCHA integration guide for Go in our documentation.

Read the documentation

First, install our TrustCaptcha Go dependency:

Install

bash

go get github.com/trustcomponent/trustcaptcha-go/v2@v2.0.1

Retrieve the verification result from our server using the verification token and the secret key of your CAPTCHA:

Fetch Result

// Retrieving the verification result
verificationResult, err := trustcaptcha.GetVerificationResult("<your_secret_key>", "<verification_token_from_your_client>")
if err != nil {
  log.Printf("Failed to fetch verification result: %v", err)
  http.Error(w, "Captcha verification failed", http.StatusInternalServerError)
  return
}

Based on the verification results and your individual needs, decide how you would like to proceed:

Handle Result

// Act on the verification result
if !verificationResult.VerificationPassed || verificationResult.Score > 0.5 {
  log.Println("Verification failed or bot score > 0.5 – possible automated request.")
}

Need detailed information about the Go CAPTCHA integration?
For detailed instructions on integrating TrustCaptcha, please refer to our Go CAPTCHA integration guide. A complete integration example for the Go CAPTCHA can be found in our CAPTCHA Samples Repository on Github.

Other backend technology instead of Go?
If you do not want to use Go on your server or have several different backends, you can select a different integration here. If there is no pre-built integration from us for your preferred backend technology, your software developers can integrate the CAPTCHA verification process themselves using our documentation or ask our support-team for a pre-built integration.

4. Congratulations 🎉

You are now protected by TrustCaptcha - congratulations!

FAQs

What is a Go CAPTCHA?

A Go CAPTCHA is a verification step that you call from server-side code written in the Go programming language to decide whether an incoming request is made by a human or a bot. It relies on a signed token that the client’s browser obtains from a CAPTCHA widget and then submits to your Go back end for validation. TrustCaptcha’s Go SDK wraps this flow in a single helper, so your handler can verify requests with one function call while inheriting multi-layered security.

What is the best Go CAPTCHA?

The best Go CAPTCHA in 2025 balances robust security, privacy compliance and friction-free UX—factors Google’s Helpful Content and page-experience systems now reward. TrustCaptcha leads here because it layers adaptive proof-of-work, an AI-driven bot-score and fine-grained security settings instead of relying on a single puzzle, giving stronger protection than other Go-ready options. It also runs entirely in EU data centers and ships with ready-made Data Processing Agreements, a must-have for GDPR-sensitive projects.

How does a Go CAPTCHA work?

A modern Go CAPTCHA adds a small JavaScript widget to the client that silently solves a proof-of-work task and collects device signals. The browser then posts a short-lived token to your Go API, where your code calls the CAPTCHA provider’s verify endpoint to receive a verdict. TrustCaptcha augments this flow with an AI-based bot-score and configurable thresholds, so you can increase or relax enforcement without rewriting code.

Do I need a Go CAPTCHA?

If your Go application accepts user input—registrations, comments, checkout, APIs—or shows signs of spam, credential stuffing or scraping, a CAPTCHA is the fastest way to cut automated abuse. Even small sites see bot traffic spikes, and mitigating them early avoids wasted bandwidth and fraudulent sign-ups. TrustCaptcha’s invisible mode keeps these protections running in the background so genuine users rarely notice a challenge.

Is TrustCaptcha GDPR compliant?

Yes. TrustCaptcha is fully hosted in the European Union, minimises collected data, sets no cookies and offers an online Data Processing Agreement that you can accept in minutes. This privacy-by-design approach satisfies Articles 25 and 32 of the GDPR and makes TrustCaptcha a safe drop-in for EU businesses and public-sector projects.

Can I customise the look of TrustCaptcha in Go?

Absolutely. The widget supports more than 35 languages, light, dark or auto themes, custom colours, rounded corners and even a fully invisible mode. You can hide TrustCaptcha branding, point the privacy link to your own policy and adjust width or autostart behaviour—changes that load instantly without touching your Go back end. These options let the CAPTCHA blend seamlessly with any design system.

How does TrustCaptcha stay accessible while blocking bots?

TrustCaptcha eliminates picture-picking and audio puzzles; instead it runs proof-of-work in the background and scores behaviour, finishing in under a second for legitimate users. This zero-interaction model meets WCAG 2.2 guidelines and shows a 183 % conversion lift over puzzle-based CAPTCHAs, according to internal benchmarks. Users with assistive technologies see no barrier, yet attackers must burn CPU cycles and often still fail the bot-score threshold.

Losing leads to CAPTCHAs?

TrustCaptcha blocks spam and bots, not customers. No puzzles, GDPR-ready, EU-hosted.

Puzzle-free UX

Runs in the background while visitors type — so more people finish your forms and fewer drop off.

GDPR-ready

EU-hosted and privacy-first: no cookies, encrypted transmission, automatic cleanup — with ready-to-use legal resources.

Multi-layer Security

Adaptive protection plus intelligent risk scoring stops abuse early — even when attack traffic spikes.

Full Control

Fine-tune sensitivity, set allow/block lists, and use geoblocking — you decide how strict verification should be.

Protect your Go application with TrustCaptcha in just a few steps!

EU-hosted & GDPR-ready
No puzzles
Try free for 14 days

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