How to Build a Website Accessibility Checker in JavaScript (Free API)
Accessibility isn't optional — it's a legal requirement in many countries and affects 15% of the world's population . Yet most sites have basic issues: missing alt text, broken heading hierarchies, missing form labels. Here's how to build your own accessibility checker in under 100 lines of JavaScript using a free scraper API — no browser automation needed. What We're Building A CLI tool that scans any URL and checks for: Missing alt attributes on images Broken heading hierarchy (h1 → h3, skipping h2) Missing form labels Empty links Missing lang attribute on <html> Low-contrast text indicators Missing ARIA landmarks Setup Get a free API key from Frostbyte API (200 free credits, no card required). export FROSTBYTE_API_KEY = "your-key-here" The Accessibility Checker // accessibility-checker.js const API_KEY = process . env . FROSTBYTE_API_KEY ; const BASE = ' https://api.frostbyte.dev ' ; async function scrape ( url ) { const res = await fetch ( ` ${ BASE } /api/scraper/scrape` , { metho
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