TypeScript Utility Types: Partial, Pick, Omit, Record and More
Utility types build new types from existing ones, so you define your data once and derive variations instead of copying fields. interface Us...
Free tutorials & developer tools
Tech concepts, explained simply.
Clear, practical tutorials on PHP, Laravel, MySQL, JavaScript, Vue JS, Angular, REST APIs, Git and more — plus handy tools to speed up your everyday development work.
Animated examples of SQL, Laravel, PHP and JavaScript code being written and run, from Technical Simple tutorials.
0:00 / 1:00
Fresh from the blog
Latest articles
The CSS :has() Selector: The Parent Selector We Always Wanted
:has() matches an element if it contains something that matches the selector inside the brackets. For the first time, CSS can style a parent...
ES Modules in Node.js: import, export and require(esm)
Node.js supports two module systems: the original CommonJS ( require ) and standard ES modules ( import ). New projects should use ESM, but...
Dependency Injection in FastAPI with Depends
FastAPI's Depends lets endpoints declare what they need (a database session, the current user, pagination settings) and FastAPI provides it....
Free utilities
Developer tools
Quick tools that run in your browser — nothing to install.
HTML Editor
Write HTML and preview it live, with formatting, import and export.
Open toolJSON Formatter
Format, validate, minify and sort JSON with exact error positions.
Open toolRegex Tester
Test regular expressions with live highlighting and capture groups.
Open toolCase Converter
Convert text to UPPER, lower, Title, Sentence and more in one click.
Open toolBase64 Encoder
Encode and decode Base64 with full Unicode and URL-safe support.
Open toolJWT Decoder
Inspect a JSON Web Token’s header, payload and expiry.
Open toolCron Helper
Explain cron schedules in plain English and see the next runs.
Open toolHash Generator
Generate MD5, SHA, PBKDF2 and Bcrypt hashes right in your browser.
Open toolTodo List
A simple, private task list that remembers your work between visits.
Open toolNever miss a new tutorial
Join the newsletter and get new articles delivered to your inbox. Free, and you can unsubscribe anytime.