Cloudflare worker, that converts a requested text into QR Code data array, with API for packing 3x3 modules as 9-bit numbers for low-end devices that expect a packing to reduce their CPU usage:

 +-----+-----+-----+-----+        +-----+-----+-----+-----+
 |0 0 0|1 1 0|1 0 1|0 0 1|        |     |     |     |     |
 |1 1 0|1 0 1|1 0 1|0 1 1|        |  24 | 235 | 365 | 308 |
 |0 0 0|1 1 0|1 0 1|0 0 1|        |     |     |     |     |
 +-----+-----+-----+-----+   ->   +-----+-----+-----+-----+
 |0 0 0|1 0 0|1 1 1|0 0 1|        |     |     |     |     |
 |0 0 0|1 0 1|1 1 1|0 0 1|        |  0  | 233 | 511 | 292 |
 |0 0 0|1 1 0|1 1 1|0 0 1|        |     |     |     |     |
 +-----+-----+-----+-----+        +-----+-----+-----+-----+

Bits being layed out this way:

 +------------+
 |1   2   4   |   1<<0  1<<1   1<<2
 |8   16  32  |   1<<3  1<<4   1<<5
 |64  128 256 |   1<<6  1<<7   1<<8
 +------------+

Deployment

• npm i to install dependencies.
• rename wrangler.example.toml to wrangler.toml, supply worker name.
• npx wrangler login
  • npx uses an installed locally package from node_modules if it finds one (and wrangler is among devDependencies), this way we are ensuring the right version. If it cannot find dependency, npx falls back to global or download.
• npx wrangler whoami to confirm who is authenticated.
• npm run deploy
  • will execute wrangler from node_modules. This is because npm automatically adds node_modules/.bin to the PATH when running scripts, making the local binaries directly executable.