I Built 25 Cloudflare Workers APIs — Here's What I Learned

Over the past few months, I built and deployed 25 APIs on Cloudflare Workers. All running on the free tier. Total monthly hosting cost: $0. Here's what I learned about building, deploying, and monetizing utility APIs at scale. The Stack Every API follows the same pattern: worker-api/ ├── src/ │ └── index.js # Single entry point ├── wrangler.toml # Cloudflare config └── package.json No frameworks. No bundlers. Just vanilla JavaScript on Cloudflare Workers. The 25 APIs Here's a sampling of what I built: API Purpose Complexity Readability Score Text analysis (Flesch-Kincaid, SMOG, ARI) Medium QR Code Generator Generate QR codes from text/URL Low Password Generator Cryptographically secure passwords Low Markdown to HTML CommonMark-compliant conversion Medium Color Converter HEX/RGB/HSL conversion Low Base64 Encoder Encode/decode Base64 Low JSON Formatter Pretty-print & validate JSON Low URL Shortener Create short URLs Medium Hash Generator MD5, SHA-1, SHA-256, SHA-512 Low Timezone Conv