JSON Cheat Sheet
# JSON Cheat Sheet
## Data Types
- **string** — "hello", "123", ""
- **number** — 42, 3.14, -7, 1e10
- **boolean** — true, false
- **null** — null
- **object** — {"key": "value"}
- **array** — [1, 2, 3]
## Syntax Rules
- Keys must be double-quoted strings
- No trailing commas allowed
- Strings use double quotes (not single)
- Unicode: \u0041 for 'A'
## Common Patterns
```json
{
"name": "John",
"age": 30,
"active": true,
"tags": ["dev", "tools"],
"address": {
"city": "NYC"
}
}
```
## Validation Checklist
1. All keys are double-quoted
2. No trailing commas
3. No comments (JSON doesn't support them)
4. Strings use double quotes only