Your First Claude API Call in TypeScript and Python
Large language model APIs all follow the same basic shape: you send a list of messages and get a message back. This guide uses the official...
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
What Is RAG? Retrieval-Augmented Generation Explained with Code
An LLM only knows what was in its training data. Retrieval-augmented generation (RAG) lets it answer questions about your data, such as docs...
What Is an AI Agent? The Agent Loop Explained
"Agent" is used for many things, but the core idea is simple: an AI agent is an LLM that decides which tools to call, sees the results, and...
What Is the Model Context Protocol (MCP)? A Developer Introduction
Before MCP, every AI application needed custom glue code for every integration: one plugin for GitHub in app A, a different one in app B. Th...
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.