This is a simple nodejs server that mocks https://goqr.me/api/
- Clone the repo
- Run
npm install - Run the code
npm run startornode index.js
The server will start on port 3000 (by default, or taken from PORT env)
GET /v1/create-qr-code/
| Name | Type | Required | Description |
|---|---|---|---|
| data | string | Yes | The data or text to encode in the QR code |
| size | string | No | QR size in WIDTHxHEIGHT format (default: 200x200) |
sizemust be in the formatNUMBERxNUMBER(e.g.300x300)- Width and height must be positive integers
- Width and height must not exceed 10,000
- Example valid sizes:
200x200,500x400,800x800 - Example invalid sizes:
-200x200,200,bigxsmall,20000x20000
GET http://localhost:3000/v1/create-qr-code/?data=HelloWorld&size=300x300
Response:
- Status:
200 OK - Content-Type:
image/png - Body: Binary PNG QR code
| Status Code | Description |
|---|---|
| 400 Bad Request | Missing data parameter |
| 400 Bad Request | Invalid size parameter |
| 400 Bad Request | size too large (> 10000) |
| 500 Internal Error | Failed to generate QR code |
| 404 Not Found | Invalid endpoint |
{
"error": "Missing data parameter"
}This was quickly built for RITU 2025 ticketing system. For mailing the tickets, I initially used this api. And had to sent about 1500 tickets, each ticket had 3 QR Codes.
On the first round (with just 86 tickets) the qoqr api hit its rate limit, causing two tickets to fail. So I knew I couldn't use this API anymore, I initially searched for other alternatives and almost all had this rate limiting.
So I built this (more like chatgpt did). This mocked the working of goqr apis as the app script that sends the emails used it for size control and other stuffs and I didn't want to break the app script. So it mocks goqr api for the basic stuffs.
Then I tunneled the sever endpoints using cloudflare tunnels. And replaced the goqr end point with the cloudflare tunnel url. All this in about 10mins or less.