Learn how to build QR code generators, secure random string tools, and Next.js invoice generators with PDF export. Practical guides and examples from the jsgenerator.com team.
How to composite a logo onto a QR code in JavaScript without breaking it: the error-correction budget, coverage maths in module units, the guard plate, canvas and SVG implementations, and how to verify the printed result.
Step-by-step overview of building an invoice generator in Next.js and exporting invoices as PDFs using Puppeteer.
A complete implementation guide for a JavaScript QR code generator: library choice, the exact payload formats for Wi-Fi, vCard, email and SMS, escaping rules, error-correction budget, print sizes, and how to verify the result with a decoder instead of hope.
Learn how to generate secure random strings in JavaScript using crypto.getRandomValues and crypto.randomBytes for passwords, API keys, and tokens.
Learn the most common patterns for generating random numbers in JavaScript, including integers, ranges, and secure random values.