JSON files: structure
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which JSON object is written correctly?
2. In the JSON {"name": "Ava", "year": 12}, what is "year"?
3. Which brackets does JSON use to hold a list of items?
4. A student file needs to hold many students, each with a name and a year level. Which structure fits best?
5. Which line is valid JSON?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1{"name": "Ava", "year": 12} | AThere is no comma between the two key-value pairs, so the file is invalid and a program cannot read it. | |
| 2"students": [{"name": "Ava"}, {"name": "Liam"}] | BA JSON object: curly braces hold key-value pairs separated by commas | |
| 3JSON can nest one object inside another to group related data | C[{"item": "Pencil"}, {"item": "Notebook"}] | |
| 4JSON stores a list of records as an array of objects, while XML needs repeated opening and closing tags | D{"student": {"name": "Ava", "house": "Red"}} | |
| 5{name: "Ava", "year": 12} | EA key whose value is an array (list) of objects, written in square brackets | |
| 6{"name": "Ava" "year": 12} | FThe key name is not wrapped in double quotes. Every JSON key must be a double-quoted string. |
C
Definitions
{"name": "Ava", "year": 12}
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
{"name": "Ava", "year"_ 12}
2.
_"name": "Ava", "year": 12}
3.
{"students": _
{"name": "Ava"},
{"name": "Liam"}]}
4.
{"name": "Ava",
"address": _"city": "Cairns"}}
5.
XML: <year>12</____>
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
{
B
"name" = "Ava",
C
"year": 12
D
}
Question 2
A
{
B
student: "Liam",
C
"house": "Blue"
D
}
Question 3
A
{
B
"id": 7,
C
"points": 120,
D
"house": "Red",
E
}
Question 4
A
{
B
"name": "Mia",
C
'year': 11
D
}
Question 5
A
{
B
"name": "Noah",
C
"marks": {88, 74, 91}
D
}
Answer Key
JSON files: structure
Section A: Quick Questions
Q1
A — {"name": "Ava", "year": 12}
Q2
A — A key, paired with the value 12
Q3
B — Square brackets [ ]
Q4
A — An array of objects: [{"name": "Ava"}, {"name": "Liam"}]
Q5
B — {"student": {"name": "Ava", "year": 12}}
Section B: Match the Pairs
Q1
{"name": "Ava", "year": 12} → A JSON object: curly braces hold key-value pairs separated by commas
Q2
"students": [{"name": "Ava"}, {"name": "Liam"}] → A key whose value is an array (list) of objects, written in square brackets
Q3
JSON can nest one object inside another to group related data → {"student": {"name": "Ava", "house": "Red"}}
Q4
JSON stores a list of records as an array of objects, while XML needs repeated opening and closing tags → [{"item": "Pencil"}, {"item": "Notebook"}]
Q5
{name: "Ava", "year": 12} → The key name is not wrapped in double quotes. Every JSON key must be a double-quoted string.
Q6
{"name": "Ava" "year": 12} → There is no comma between the two key-value pairs, so the file is invalid and a program cannot read it.
Section C: Definitions
Q1
{"name": "Ava", "year": 12} — JSON stores data as key-value pairs inside curly braces, with lists in square brackets. Objects can nest inside each other, so programs can read it easily. It is a lighter alternative to XML.Section D: Fill in the Blanks
Q1
{"name": "Ava", "year": 12}Q2
{"name": "Ava", "year": 12}Q3
{"students": [
{"name": "Ava"},
{"name": "Liam"}]}Q4
{"name": "Ava",
"address": {"city": "Cairns"}}Q5
XML: <year>12</year>Section E: Spot the Error
Q1
B — A JSON key and its value are separated by a colon, not an equals sign. It should be "name": "Ava",
Q2
B — JSON keys must be wrapped in double quotes. It should be "student": "Liam",
Q3
D — The last key-value pair must not end with a comma, because nothing follows it before the closing brace. It should be "house": "Red"
Q4
C — JSON requires double quotes around keys. Single quotes are not valid. It should be "year": 11
Q5
C — A list of values in JSON goes in square brackets, not curly braces. It should be "marks": [88, 74, 91]