JSON Developer Guides
Practical reference for developers working with JSON. No filler — just the syntax, types, and error patterns you actually need to know.
What is JSON?
4 minIntroduction to JSON — what it is, where it came from, and why it matters for modern APIs and data interchange.
JSON Syntax Reference
6 minComplete syntax rules for objects, arrays, strings, numbers, booleans, and null. With examples and gotchas.
JSON Data Types
5 minAll six JSON data types explained with examples, limits, and common type coercion pitfalls.
Common JSON Errors
7 minThe most common JSON parse errors with invalid/valid examples and a quick diagnostic checklist.
How to Format JSON
4 minFormat JSON in your browser, from the command line (jq, Python), in JavaScript, and in Python.
JSON vs JSON5
5 minKey differences between standard JSON and JSON5. When to use each, and why mixing them up causes parse errors.