BuildQuill
Lessons 1 / 6JSON Foundations7 min
Lesson 1 of 67 minJSON Foundations

What JSON Is and Where It Appears

JSON is a text format for structured data. You see it in APIs, config files, app settings, and exports.

Core concepts

  • Objects use key-value pairs.
  • Arrays hold ordered lists.
  • JSON is text, not a database.
  • APIs often send and receive JSON.

Example

{
  "name": "BuildQuill",
  "type": "tool site",
  "features": ["format", "convert", "validate"]
}

Practice

Write a JSON object that describes a course with a title, level, duration, and a list of topics.

JSON FormatterJSON Viewer

Checklist

  • Use double quotes around keys.
  • Use commas between fields.
  • Use an array for multiple topics.

Quiz

Which statement is true about JSON?

Playground