{
  "service": "qr",
  "description": "Makes a QR code from text or a URL and returns it as SVG or PNG. Free, no key, no sign-up.",
  "usage": [
    "GET /qr.svg?text=https%3A%2F%2Flandnav.app",
    "GET /qr.png?text=https%3A%2F%2Flandnav.app&size=512"
  ],
  "parameters": {
    "text": "Required. The text or URL to encode, URL-encoded. Up to about 2,900 bytes at ecc=L, less at higher levels.",
    "ecc": "Optional. Error correction: L, M (default), Q or H. Higher survives more damage and makes a denser code.",
    "size": "PNG only. Width and height in pixels, 64 to 2048, default 1024. The PNG is exactly this size.",
    "download": "Optional. Any value makes the answer a download with a file name made from the text."
  },
  "output": "Black on white with the standard 4-module quiet zone. SVG scales without blurring and suits web pages and print. PNG is 1-bit.",
  "errors": "400 with JSON { error } when text is missing or too long, or ecc or size is out of range.",
  "privacy": "The API sees the text in the request and keeps nothing: no logs, no storage, no analytics. The page at / makes codes in the browser and sends nothing.",
  "auth": "None. CORS is open, so a browser can call this directly.",
  "caching": "An answer never changes for the same request, so it is cacheable for a year.",
  "terms": "Free, unsupported, not for volume, and as is. Send a User-Agent that names your app.",
  "repository": "https://github.com/gshaw/qr"
}