JSON as standard format in Rest API - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the Content-Type header to JSON.

Rest API

headers = {"Content-Type": "[1]"}

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

Aapplication/json

Btext/html

Capplication/xml

Dtext/plain

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'text/html' or 'application/xml' instead of 'application/json'.

The Content-Type header must be set to application/json to indicate JSON data.

2fill in blank

medium

Complete the code to convert a Python dictionary to a JSON string.

Rest API

import json
json_data = json.[1](data)

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

Adumps

Bload

Cdump

Dloads

Attempts:

3 left

💡 Hint

Common Mistakes

Using load or loads which are for reading JSON.

The json.dumps() function converts a Python object to a JSON string.

3fill in blank

hard

Fix the error in the code to parse JSON from a string.

Rest API

import json
parsed = json.[1](json_string)

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

Adump

Bdumps

Cloads

Dload

Attempts:

3 left

💡 Hint

Common Mistakes

Using load which reads from a file, not a string.

The json.loads() function parses a JSON string into a Python object.

4fill in blank

hard

Fill both blanks to create a JSON response with status code 200.

Rest API

response = [1](json.dumps(data), [2]=200, headers=headers)

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

Amake_response

Bjsonify

Cstatus

Dcontent_type

Attempts:

3 left

💡 Hint

Common Mistakes

Using jsonify which returns a response but does not accept status code like this.

make_response creates a response object. The status code is set with status.

5fill in blank

hard

Fill all three blanks to extract a value from JSON request data.

Rest API

from flask import request
json_data = request.[1]
value = json_data.get([2], [3])

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

Ajson

B"key"

CNone

Dargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using args which is for query parameters, not JSON body.

Use request.json to get JSON data. Use get("key", None) to safely access a value.

Practice

1. What is the main reason REST APIs use JSON as their standard format?

easy

A. Because JSON is easy to read and write for both humans and machines

B. Because JSON requires special software to understand

C. Because JSON is a binary format

D. Because JSON only supports numbers

Solution

1. Step 1: Understand JSON format

   JSON is a text-based format that uses simple syntax with objects and arrays.

2. Step 2: Identify why REST APIs prefer JSON

   REST APIs use JSON because it is easy for humans to read and easy for machines to parse.

3. Final Answer:

   Because JSON is easy to read and write for both humans and machines -> Option A

4. Quick Check:

   JSON is text-based and readable [OK]

Hint: JSON is popular because it's simple and readable [OK]

Common Mistakes:

• Thinking JSON is binary
• Believing JSON needs special software
• Assuming JSON only supports numbers

2. Which of the following is the correct JSON syntax for an object with a key "name" and value "Alice"?

easy

A. {"name" = "Alice"}

B. {name: "Alice"}

C. ["name": "Alice"]

D. {"name": "Alice"}

Solution

1. Step 1: Recall JSON object syntax

   JSON objects use curly braces with keys and values as strings, keys must be in double quotes.

2. Step 2: Check each option

   {"name": "Alice"} uses double quotes correctly around key and value, with colon separator.

3. Final Answer:

   {"name": "Alice"} -> Option D

4. Quick Check:

   Keys and strings in double quotes [OK]

Hint: Keys and string values must be in double quotes [OK]

Common Mistakes:

• Omitting quotes around keys
• Using square brackets for objects
• Using equals sign instead of colon

3. Given this JSON response from a REST API:

{"status": "success", "data": [10, 20, 30]}

What is the value of the key "data"?

medium

A. "success"

B. [10, 20, 30]

C. 10

D. {"status": "success"}

Solution

1. Step 1: Identify the key "data" in JSON

   The key "data" holds an array with values 10, 20, and 30.

2. Step 2: Match the value to the options

   [10, 20, 30] correctly shows the array [10, 20, 30].

3. Final Answer:

   [10, 20, 30] -> Option B

4. Quick Check:

   Key "data" = array [10, 20, 30] [OK]

Hint: Look for the key and read its value exactly as shown [OK]

Common Mistakes:

• Confusing key "status" value with "data"
• Picking a single number instead of the array
• Choosing the whole JSON object as value

4. You receive this JSON string from an API:

{"user": "Bob", "age": 25,}

What is wrong with this JSON?

medium

A. Trailing comma after the last item is invalid

B. Keys must be numbers, not strings

C. Values cannot be numbers

D. Missing square brackets around the object

Solution

1. Step 1: Check JSON syntax rules

   JSON objects cannot have a comma after the last key-value pair.

2. Step 2: Identify the error in the string

   The comma after "age": 25 is invalid and causes a syntax error.

3. Final Answer:

   Trailing comma after the last item is invalid -> Option A

4. Quick Check:

   No trailing commas allowed in JSON objects [OK]

Hint: No commas after last item in JSON objects [OK]

Common Mistakes:

• Thinking keys must be numbers
• Believing numbers are invalid values
• Adding brackets incorrectly

5. You want to send a JSON payload to a REST API with user info: name "Eve", age 28, and hobbies as an array of "reading" and "swimming". Which JSON is correct?

hard

A. {"name": "Eve", "age": 28, "hobbies": "reading, swimming"}

B. {"name": Eve, "age": "28", "hobbies": ("reading", "swimming")}

C. {"name": "Eve", "age": 28, "hobbies": ["reading", "swimming"]}

D. {"name": "Eve", "age": 28, "hobbies": {"reading", "swimming"}}

Solution

1. Step 1: Check correct JSON types for each field

   Name is a string, age is a number, hobbies is an array of strings.

2. Step 2: Validate each option's syntax

   {"name": "Eve", "age": 28, "hobbies": ["reading", "swimming"]} correctly uses double quotes for strings, numbers without quotes, and square brackets for array.

3. Final Answer:

   {"name": "Eve", "age": 28, "hobbies": ["reading", "swimming"]} -> Option C

4. Quick Check:

   Strings in quotes, numbers plain, arrays in brackets [OK]

Hint: Use quotes for strings, brackets for arrays, no quotes for numbers [OK]

Common Mistakes:

• Using parentheses instead of brackets for arrays
• Not quoting string values
• Putting numbers in quotes unnecessarily