Request validation in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flask class.

Flask

from flask import [1]
app = [1](__name__)

Drag options to blanks, or click blank then click option'

ARequest

Brender_template

CFlask

Djsonify

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of Flask

Using lowercase 'flask' instead of 'Flask'

The Flask class is imported from the flask module to create the app instance.

2fill in blank

medium

Complete the code to get JSON data from a POST request.

Flask

from flask import request

@app.route('/data', methods=['POST'])
def data():
    data = request.[1]
    return 'Received'

Drag options to blanks, or click blank then click option'

Ajson

Bform

Cheaders

Dargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using request.args which is for URL parameters

Using request.form which is for form data

Use request.json to access JSON data sent in the request body.

3fill in blank

hard

Fix the error in the code to validate a required JSON field 'name'.

Flask

from flask import request, abort

@app.route('/submit', methods=['POST'])
def submit():
    data = request.json
    if not data or '[1]' not in data:
        abort(400, 'Missing name')
    return 'OK'

Drag options to blanks, or click blank then click option'

Aemail

Busername

Cid

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for a wrong key like 'username' or 'email'

Not checking if data is None before key check

The code checks if the key 'name' is present in the JSON data to validate the request.

4fill in blank

hard

Fill both blanks to extract 'age' from JSON and check if it is an integer.

Flask

data = request.json
age = data.get([1])
if not isinstance(age, [2]):
    abort(400, 'Age must be an integer')

Drag options to blanks, or click blank then click option'

A'age'

Bint

Cstr

D'name'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong key like 'name' instead of 'age'

Checking type against 'str' instead of 'int'

Use data.get('age') to get the age value and check if it is an int.

5fill in blank

hard

Fill all three blanks to return a JSON error response with status 400.

Flask

from flask import jsonify, abort

@app.route('/check', methods=['POST'])
def check():
    data = request.json
    if not data or 'email' not in data:
        return jsonify([1]: [2]), [3]
    return 'Valid'

Drag options to blanks, or click blank then click option'

A'error'

B'Missing email'

C400

D'message'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong JSON key like 'message' instead of 'error'

Returning status 200 instead of 400

Return a JSON object with key 'error' and message 'Missing email' and HTTP status 400.