Guides
Short, practical explanations of the jobs our tools do, with worked examples.
- How to format JSON (and fix the errors that break it)Format, minify and validate JSON, and fix the errors that break it: trailing commas, single quotes, comments and lost precision on big numbers.
- How to test a regular expression without getting burnedBuild and test a regex step by step: flags, anchors, groups, greedy vs lazy matching, JavaScript vs PCRE differences, and catastrophic backtracking.
- How to convert CSV to JSON without corrupting your dataConvert CSV to JSON safely: quoting rules, delimiters, encodings, leading zeros and dates, and the formula-injection risk when going back to CSV.
- How to calculate loan EMI, step by stepThe EMI formula explained with a worked ₹10 lakh example, why early EMIs are mostly interest, and how much a prepayment really saves.
- How to check DNS records (and what each one means)Check A, AAAA, CNAME, MX, TXT, NS and SOA records, understand TTLs and propagation, and troubleshoot email and domain verification.