Developer Tools

Practical explanations of DNS, HTTP, encoding, formatting and other tools developers use every day.

How to Check an SSL Certificate Expiration Date (4 Ways)

29 October, 2026 • Developer Tools

Check when any SSL certificate expires: online, in your browser, or with openssl and curl. Real examples, plus what a valid date does not prove.

28 October, 2026 • Developer Tools

Fix invalid JSON fast: decode Unexpected token errors and fix trailing commas, quotes, comments and missing brackets, step by step.

28 October, 2026 • Developer Tools

Check DNS records online or with dig and nslookup. Learn what A, AAAA, CNAME, MX, TXT, NS and CAA records do and how to fix common DNS problems.

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