How to Generate a UUID for Your Database
Learn how to generate a UUID v4 for your database, understand the 8-4-4-4-12 format, and see a worked example with storage and safety guidance.
How to Generate a Secure Password That Actually Protects You
Learn how to generate a secure password: 16+ random characters, a password manager, one password per account, and two-factor authentication.
How to Verify a File With a SHA-256 Checksum
Learn how to verify a file with a SHA-256 checksum: get the published hash, compute the hash, compare every character, and know what a match does and does not prove.
How to Encode Text in Base64 (and Decode It Back)
Learn Base64 encoding: the 64-character alphabet, worked example Hello to SGVsbG8=, decoding, and why Base64 is not encryption.
How to Convert a Timestamp to a Readable Date
Learn how to convert a timestamp to a readable date: seconds vs milliseconds, time zones, and a worked example for 1700000000.
How to Test a Regular Expression Before You Use It
Learn how to test a regular expression with test strings, anchors, and edge cases, using a worked example with \d+ matching 123 and 456.
How to Preview Markdown Before You Publish It
Learn how to preview Markdown before you publish it, check headings, bold text, links, and lists, and confirm the result on the target site.
How to Format SQL Queries So Your Team Can Read Them
Learn how to format SQL with uppercase keywords, one clause per line, and clear aliases, with a SELECT worked example and how to test after reformatting.
What Is XML and When Should You Still Use It
What is XML, how tags and attributes work, and when to still use it, with a book catalog worked example, JSON vs XML, and why simple config needs a simpler format.
How to Format JavaScript Without Breaking It
Learn how to format JavaScript with consistent indentation, explicit semicolons, and short lines, plus a worked example and how to test after formatting.