Explore challenge selection, API integration, and form testing. Practical guidance for developers and teams protecting their own websites and validating integrations.
Browse the library: 100 articles
See what CAPTCHA checks, where websites use it to reduce automated submissions, and how a challenge can add friction. We explain common challenge types and why accessibility belongs in the design.
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Learn to add the widget, verify its token on your server, and keep the secret key safe. This setup plan covers network errors, retries, and configuration checks before release.
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Check successful completion, rejection, token expiry, repeat submissions, and network loss. This test-environment checklist helps confirm the form stays usable while the server rejects unverified requests.
Read article →Rate limits control request frequency, while CAPTCHA adds a check to selected risky flows. Learn how to combine them, set clear limits, and avoid blocking visitors who share a network.
Read article →Clear instructions, keyboard support, and an alternative verification method make forms easier for more people. Review the challenge, error messages, and retry flow to remove avoidable barriers.
Read article →Check the domain and keys, token lifetime, and server verification request. This troubleshooting sequence helps find the cause without disabling protection or exposing secrets in logs.
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