Demonstrates how to post form data and process a JSON response using JavaScript. This allows making requests without navigating away from the page. Demonstrates using XMLHttpRequest, fetch, and jQuery.ajax. See the Flask docs about jQuery and Ajax.

$ python3 -m venv venv
$ . venv/bin/activate
$ pip install -e .

$ export FLASK_APP=js_example
$ flask run

Open http://127.0.0.1:5000 in a browser.

$ pip install -e '.[test]'
$ coverage run -m pytest
$ coverage report