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Editor's pickBuild a JavaScript JSON formatter and validator with JSON.parse and JSON.stringify. Handle indentation, syntax errors, tests, and large-input trade-offs.
Build a JavaScript Markdown converter with markdown-it and DOMPurify. Learn syntax choices, safe rendering, XSS risks, and practical tests.
Build a Node.js GitHub repository analyzer that fetches public metadata, paginates contributor results, validates input, and handles API errors and limits.
Build a Node.js REST API from scratch with routes, JSON validation, error handling, environment variables, automated tests, and deployment guidance.
Learn how to read, add, update, and delete URL query parameters in JavaScript with URLSearchParams, practical examples, and common pitfalls.
Learn to read, add, update, and delete URL parameters in JavaScript with URLSearchParams, including repeated keys, encoding, and browser URL updates.