JSON – stringify and parse
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does JSON.stringify() convert a JS value into a JSON string?
2. Does JSON.parse() convert a JSON string into a JS value?
3. Is 'json' with a lowercase j valid for JSON.stringify()?
4. Must 'stringify' be written in lowercase?
5. Must 'parse' be written in lowercase?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1JSON.stringify(person) | AJSON.parse(text) | |
| 2JSON.parse(json) | BWrong - 'parse' must be lowercase | |
| 3Converts a JS value into a JSON-formatted string | CJSON.stringify(data) | |
| 4Converts a JSON string into a usable JS value | DConverts a JSON string back into a JS value | |
| 5let j = json.stringify(obj); | EWrong - 'JSON' must be capitalized | |
| 6let o = JSON.Parse(text); | FConverts the person object into a JSON string |
C
Definitions
JSON.stringify()
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
let json = JSON._________(person);
2.
let obj = JSON._____(json);
3.
let text = JSON._________(data);
4.
let result = JSON._____(text);
5.
let data2 = JSON._________({a: 1});
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
let j = json.parse(s);
B
let s = '{"a":1}';
C
console.log(j);
Question 2
A
let t = {b: 2};
B
let j = JSON.Stringify(t);
C
console.log(j);
Question 3
A
let u = {c: 3};
B
let j2 = JSON.stringify(u);
C
let k = JSON.Parse(j2);
Question 4
A
let m = Json.stringify(x);
B
let x = {d: 4};
C
console.log(m);
Question 5
A
let y = {e: 5};
B
let n = JSON.stringfy(y);
C
console.log(n);
Answer Key
JSON – stringify and parse
Section A: Quick Questions
Q1
B — Yes
Q2
B — Yes
Q3
A — No
Q4
A — Yes
Q5
A — Yes
Section B: Match the Pairs
Q1
JSON.stringify(person) → Converts the person object into a JSON string
Q2
JSON.parse(json) → Converts a JSON string back into a JS value
Q3
Converts a JS value into a JSON-formatted string → JSON.stringify(data)
Q4
Converts a JSON string into a usable JS value → JSON.parse(text)
Q5
let j = json.stringify(obj); → Wrong - 'JSON' must be capitalized
Q6
let o = JSON.Parse(text); → Wrong - 'parse' must be lowercase
Section C: Definitions
Q1
JSON.stringify() — Converts a JavaScript value into a JSON-formatted string.Section D: Fill in the Blanks
Q1
let json = JSON.stringify(person);Q2
let obj = JSON.parse(json);Q3
let text = JSON.stringify(data);Q4
let result = JSON.parse(text);Q5
let data2 = JSON.stringify({a: 1});Section E: Spot the Error
Q1
A — 'JSON' must be capitalized - it's not 'json'.
Q2
B — 'stringify' must be lowercase - a capital S causes an error.
Q3
C — 'parse' must be lowercase - a capital P causes an error.
Q4
A — 'JSON' must be all uppercase, not 'Json'.
Q5
B — 'stringify' is misspelled as 'stringfy'.