JSON basics in JavaScript

What this snippet does

JSON.stringify converts objects to strings for storage or transfer; JSON.parse reconstructs them — always returns a deep copy.

Expected output

{"name":"Alice","age":30,"active":true,"scores":[95,87]}
string
{ name: 'Alice', age: 30, active: true, scores: [ 95, 87 ] }
object

Why practise typing this

Typing json code builds muscle memory for the symbols and indentation JavaScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.

More JavaScript practice

• JSON replacerJSON · intermediate
• JSON limitsJSON · intermediate
• let vs constVariables · beginner
• const configVariables · beginner
• const mutationVariables · beginner
• var hoistingVariables · beginner