JSON: structured data you can read
Learn the objects, arrays, names, values, and nesting that appear in APIs, GeoJSON, configuration, and many modern protocols.
Why this matters
Many integrations look intimidating until you can recognize the small set of structures JSON uses. Once you can read JSON, API examples, GeoJSON, webhooks, AT Protocol records, and tool payloads become much easier to inspect.
Learn it
A JSON object uses name/value pairs inside braces. Arrays use brackets. Values can be strings, numbers, booleans, null, objects, or arrays. JSON itself does not tell you what a field means; that comes from a schema, specification, API contract, or application agreement.
Work through an example
The same object can be carried in an HTTP request, stored in a file, or embedded as part of a larger message. JSON describes structure, not transport.
{
"stationId": "station-7",
"value": 18.4,
"units": "C",
"active": true,
"tags": ["water", "temperature"]
}Practice
- 1Read the sample and identify every string, number, boolean, object, and array.
- 2Add a units field without changing the existing meanings.
- 3Ask what external contract tells you whether 'value' means temperature, depth, or something else.
What to watch for
Valid JSON can still be invalid for an API. Syntax only proves that the JSON is structurally well formed; schemas and application rules define what is acceptable.
Where this takes you
JSON is foundational for APIs, GeoJSON, webhooks, configuration, AI tool calls, and many open protocols.