JSON and structured data
Read the shared format that APIs, workflows, and AI tools use to exchange information.
- 8 minutes
- foundation
- Reviewed 2026-07-16
What is it?
JSON represents data with keys and values. Objects group named fields, arrays hold ordered items, and values can contain nested objects or arrays.
Why does it matter?
Automation needs predictable shapes. Structured data lets a later step find customer.email or items[0].price instead of guessing where information appears in a paragraph.
The mental model
Structured data gives systems a shared format they can reliably understand.
A simple example
An order object can contain an ID, customer object, and array of line items. Each field has a stable name and type.
What it is not
JSON is not a database and does not prove that values are valid. It is a representation that still needs schema and business validation.
Learn this first
These ideas make the lesson easier to place.
- Data fields
Your first 60 minutes
Use one focused hour to make the idea concrete.
- Read a small object with strings, numbers, and booleans.
- Add a nested customer object and an items array.
- Deliberately break one bracket, then use a validator to find the error.
Build this first
Transform three messy form fields into a validated order object and reject missing required values.
When not to use it
Do not force JSON onto people-facing documents when a readable form, table, or PDF is the actual product.
What to learn next
Learn schemas and structured AI output.