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Free developer tools & tutorials, built to run in your browser.
Format JSON, encode Base64, generate passwords, convert cases — then learn how it all works with step-by-step tutorials and a live code editor. No signup, no uploads, no tracking.
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Popular tools
JSON Formatter & Validator
Format, beautify and validate JSON instantly.
Word Counter
Count words, characters, sentences and reading time.
Case Converter
Convert text between UPPER, lower, Title, camelCase & more.
Base64 Encoder / Decoder
Encode and decode Base64 strings instantly in your browser.
URL Encoder / Decoder
Encode and decode URLs and query strings instantly.
Password Generator
Generate strong, random passwords with custom rules.
ls /tutorials
Latest tutorials
cybersecurity · Basic
Public Wi-Fi Safety: How to Stay Secure at Cafés, Airports & Hotels
Free public Wi-Fi is convenient but risky — learn the real threats (evil twins, snooping, fake login pages) and the simple habits that keep your data safe.
web-development · Intermediate
JavaScript Functions Deep Dive: Parameters, Returns & Arrow Functions
Go beyond the basics — function declarations vs arrow functions, default parameters, return values, scope and the early-return pattern, building a real tip calculator.
web-development · Basic
JavaScript Arrays & Loops: Working with Lists of Data
Learn arrays and loops in JavaScript — store lists, loop with for and for...of, and use push, map and filter to process data, all in the live editor.
tail -f /blog
From the blog
2026-08-17
How to Convert a Unix Timestamp to a Date in JavaScript
Convert a Unix timestamp to a date in JavaScript with new Date(timestamp * 1000). The seconds-vs-milliseconds rule, time zone formatting and common fixes.
2026-08-09
Why Does Unix Time Start on January 1, 1970?
Why does Unix time start in 1970? The real reason Bell Labs chose the 1970 epoch — and why counting seconds from a fixed zero point keeps time simple.
whoami
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