How To Return Json With Error Code Flask?

To do so we can use the make_response() function in Flask. We still make use of jsonify() in combination with this make_response() so that the error message is a correct JSON string. If we now curl the endpoint without an ID we see the error message with the 400 status code as response.

How do I return a JSON response?

To return JSON from the server, you must include the JSON data in the body of the HTTP response message and provide a Content-Type: application/json response header. The Content-Type response header allows the client to correctly interpret the data in the response body.

What does Jsonify return?

jsonify() is a helper method provided by Flask to properly return JSON data. jsonify() returns a Response object with the application/json mimetype set, whereas json. dumps() simply returns a string of JSON data. This could lead to unintended results.

How do I return a JSON response in Flask?

Use flask. jsonify() to return a JSON response

  1. app = flask. Flask(__name__)
  2. @app. route(“/”)
  3. def index():
  4. return flask. jsonify(response_value_1=1,response_value_2=”value”)
  5. app. run(host=”″, port=8080)
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How do you return a JSON response in Python?

Python supports JSON through a built-in package called json and this module can be used to covert a python dictionary to JSON object. Approach:

  1. Import module.
  2. Create a Function.
  3. Create a Dictionary.
  4. Convert Dictionary to JSON Object Using dumps() method.
  5. Return JSON Object.

How do I return JSON in Django?

How to return a JSON response in Django

  1. from django.
  2. import json # for older versions (and using python < 2.7) #from django.utils import simplejson # and change the json.dumps for simplejson.dumps from django.
  3. { “id”:4, “name”:”Test Response”, “roles”:[ “Admin”, “User” ] }

Can servlet return JSON?

To send a JSON response from the Servlet we first need to convert the Employee object into its JSON representation. There are many java libraries available to convert an object to there JSON representation and vice versa.

How do I return a Flask list?

1 Answer

  1. from flask import jsonify.
  2. @bookings.route( ‘/get_customer’, methods=[ ‘POST’ ] )
  3. def get_customer():
  4. name = {}
  5. for key, value in request.form.items():
  6. name[ key ] = value.
  7. customer_obj = customer_class.Customer()
  8. results = customer_obj.search_customer( name )

What is Make_response Flask?

make_response is a function in the flask. helpers module of the Flask web framework. make_response is for adding additional HTTP headers to a response within a view’s code. make_response can also be imported directly from the flask module instead of flask.

How do I serve a JSON file in Flask?

Add the directory structure of your project (including the location of your json file) and the URL you are sending to Flask to request this json data.

What does json () return in Python?

json() – Python requests. response. json() returns a JSON object of the result (if the result was written in JSON format, if not it raises an error). Python requests are generally used to fetch the content from a particular resource URI.

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What is Flask response?

The Flask response class, appropriately called Response, is rarely used directly by Flask applications. Instead, Flask uses it internally as a container for the response data returned by application route functions, plus some additional information needed to create an HTTP response.

How do I extract data from a json file in Python?


  1. Create a new Python file an import JSON.
  2. Crate a dictionary in the form of a string to use as JSON.
  3. Use the JSON module to convert your string into a dictionary.
  4. Write a class to load the data from your string.
  5. Instantiate an object from your class and print some data from it.

Can you return an object in Python?

You can use any Python object as a return value. Since everything in Python is an object, you can return strings, lists, tuples, dictionaries, functions, classes, instances, user-defined objects, and even modules or packages.

How do I return a json response in spring boot?

If you want to return a json serialized string then just return the string. Spring will use StringHttpMessageConverter instead of JSON converter in this case. if json string is what you want to return from java then you can just return a string if it is already json serialized.

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