String to QR Code
Setup a webapp to generate QR code. Demo available at https://ez-qrcode-generator.herokuapp.com/
The Design
One liner:
- the webapp should allow users to type in some text and convert text to QR code
UI cannot be simpler:
- A label
- A text input field
- A submit button
The Technology
Life is short, use Python
The Implementation
See GitHub repo.
-
python-qrcode does all the dirty work to generate QR code from string
-
flask serves a webapp with only one endpoint, it returns the form upon GET and displays the QR code image upon POST
-
the flask snippet shows how to avoid creating a temp file for the image
The Deploy
Deploying this simple MVP to Heroku is easy.
runtime.txt
python-3.7.3 specifies the python version
requirements.txt
pip freeze the dependencies to a requirements.txt file
Procfile
Create a Procfile to declare it as a web app served by gunicorn web: gunicorn app:app --log-file=-
See Getting Started on Heroku with Python for more info.
The Demo
Demo available at ez-qrcode-generator.herokuapp.com
Interesting use case includes:
Set up wifi network/password
Use the template WIFI:T:WPA;S:<network>;P:<password>;; where <network> and <password> are your network's name and password respectively