Return JSON response from Flask view

python json flask
Code Ninja picture Code Ninja · Oct 26, 2012 · Viewed 549.6k times · Source

I have a function that analyzes a CSV file with Pandas and produces a dict with summary information. I want to return the results as a response from a Flask view. How do I return a JSON response?

@app.route("/summary")
def summary():
    d = make_summary()
    # send it back as json

Answer

codegeek picture codegeek · Oct 26, 2012

Pass the summary data to the jsonify function, which returns a JSON response.

from flask import jsonify

@app.route('/summary')
def summary():
    d = make_summary()
    return jsonify(d)

As of Flask 0.11, you can pass any JSON-serializable type, not just dict, as the top level object.

Related questions

How to get POSTed JSON in Flask?

I'm trying to build a simple API using Flask, in which I now want to read some POSTed JSON. I do the POST with the Postman Chrome extension, and the JSON I POST is simply {"text":"lalala"}. I try to …

Read More
json.dumps vs flask.jsonify

I am not sure I understand the purpose of the flask.jsonify method. I try to make a JSON string from this: data = {"id": str(album.id), "title": album.title} but what I get with json.dumps differs from what …

Read More
TypeError: ObjectId('') is not JSON serializable

My response back from MongoDB after querying an aggregated function on document using Python, It returns valid response and i can print it but can not return it. Error: TypeError: ObjectId('51948e86c25f4b1d1c0d303c') …

Read More