How to Format and Validate JSON Online (Step-by-Step Guide)
Format messy JSON into readable code and validate it for errors online. Learn what valid JSON looks like and how to fix syntax problems.
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JSON vs XML: Differences, Examples and How to Convert
JSON vs XML compared: syntax, size, readability and typical uses, with side-by-side examples and how to convert one into the other.
Common JSON Errors and How to Fix Them
Trailing commas, single quotes, unescaped characters – the JSON errors developers hit most often and exactly how to fix each one.
What Is a UUID and When Should You Use One?
What a UUID is, how versions 1, 4, 5 and 7 differ, how unique v4 really is and when to use a UUID instead of an auto-increment database ID.
DNS Records Explained: A, MX, CNAME, TXT and NS
A, AAAA, CNAME, MX, NS, TXT and SOA records explained simply: what each DNS record does, real examples and how to look them up for any domain.
How to Find the IP Address and Host of Any Website
Find the IP address, hosting company and server location of any website in seconds, and learn what that information can tell you.
How to Check if Your Domain or IP Is Blacklisted
Check if your domain's IP is on about 80 spam blacklists, why it happens and how to get delisted so your emails reach the inbox again.
How to Convert kg to Pounds and Pounds to kg
Convert kilograms to pounds and pounds to kg with the exact factor, a quick shortcut and a handy table for body weight and luggage.
Metric vs Imperial Units Explained with Conversion Tables
Metric vs imperial units: where each system is used, the key conversions for length, weight and volume, and easy tables to keep.
12 Free Online Unit Converters for Students and Engineers
Twelve free unit converters for length, weight, temperature, area, volume and speed – fast, accurate tools for students and engineers.
How to Check Domain Age and Why It Matters for SEO
Find out when a domain was registered and how old it is, what WHOIS data shows and how much domain age really matters for SEO.
Simple Interest Explained: Formula, Examples and Uses
Simple interest explained: the formula, worked examples for loans and savings, and how it compares with compound interest over time.