Form Tips, Tutorials
& Developer Guides
Practical articles on HTML forms, AJAX, spam protection, React integrations,
and form backend best practices - written for developers.
How to Format and Validate JSON (and Fix the 7 Most Common Errors)
Unreadable one-line API responses and "Unexpected token" errors waste hours. Here is how to format, validate and fix JSON fast, with the seven mistakes behind almost every parse error.
Base64 Encoding Explained: How It Works and When to Use It
Base64 shows up in data URIs, JWTs, email attachments and auth headers. Here is what it actually does, why the output is 33% bigger, and the mistakes that break it.
URL Encoding Explained: Percent-Encoding, Query Strings and Form Data
Why does a space become %20 in one place and + in another? A practical guide to URL encoding, query strings, encodeURIComponent and how HTML forms encode what users type.
How to Check if an Email Address Is Valid (Without Sending an Email)
Bounced emails, fake sign-ups and typos cost you leads and sender reputation. Here is what you can check about an address without sending to it, what you cannot, and how to stop bad emails at the form.
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