Minified JSON in flask's jsonify()

Question

Flask offers the convenient jsonify() function, which returns a JSON object from Python variables:

from flask import Flask, jsonify
app = Flask(__name__)

@app.route("/")
def json_hello():
    return jsonify({x:x*x for x in range(5)}), 200

if __name__ == "__main__":
    app.run(debug=True)

Which returns:

{
  "0": 0, 
  "1": 1, 
  "2": 4, 
  "3": 9, 
  "4": 16
}

(PS - note the conversion from int to string to comply with JSON).

This indented format is wasteful for long outputs, and I prefer the minified version:

{"1": 1, "0": 0, "3": 9, "2": 4, "4": 16}

How can I get the JSON in minified version from Flask's jsonify()?

Answer 1

Simply set the configuration key JSONIFY_PRETTYPRINT_REGULAR to False - Flask pretty-prints JSON unless it is requested by an AJAX request (by default).