Free Developer APIs

Ten fast utility APIs with free tiers. JSON in, JSON out. No credit card for the free plan.

QR Code Generator API

Generate QR codes as SVG or base64 PNG. Custom size, error correction levels L/M/Q/H.

GET /api/qr?text=...&format=svg
FREE TIER

Email Validation API

Syntax check, DNS resolution, disposable domain detection, role accounts, deliverability score.

GET /api/email-validate?email=...
FREE TIER

Cron Expression Parser API

Human-readable explanation and next 5 fire times. Steps, ranges, month and weekday names.

GET /api/cron?expression=*/15 * * * *
FREE TIER

IP Geolocation API

Country, region, city, coordinates, timezone, and ISP for any IPv4 address.

GET /api/ip-geo?ip=8.8.8.8
FREE TIER

JSON Formatter & Validator API

Validate, pretty-print, or minify JSON. Detailed error positions for invalid input.

GET /api/json-format?text={...}
FREE TIER

Markdown to HTML API

Convert Markdown to clean HTML with tables and fenced code blocks. Fast and deterministic.

GET /api/markdown?text=...
FREE TIER

URL Metadata Scraper API

Extract title, description, OpenGraph, and Twitter Card metadata from any URL.

GET /api/metadata?url=...
FREE TIER

Secure Password Generator API

Cryptographically secure passwords with configurable length, symbols, and entropy stats.

GET /api/password?length=24
FREE TIER

Text Statistics & Readability API

Word count, reading time, Flesch Reading Ease score, readability grade, top words.

GET /api/text-stats?text=...
FREE TIER

Market Intelligence API

Launch readiness scoring, pricing recommendations, content plans, live Hacker News demand.

GET /api/market-demand?query=...
FREE TIER

Try it right now

curl "https://qr-code-generator225.p.rapidapi.com/api/qr?text=hello&format=svg" \ -H "X-RapidAPI-Key: YOUR_KEY" \ -H "X-RapidAPI-Host: qr-code-generator225.p.rapidapi.com"

Get your free API key on any of the listing pages above. All examples also on GitHub.