JSON basics
How to write valid JSON and fix typical errors.
Valid JSON structure
{
"name": "John",
"age": 30,
"active": true
}- Keys must be in double quotes.
- No trailing commas after the last item.
- Only these value types: string, number, boolean, null, object, array.
Typical errors
Most errors come from missing quotes, commas, or using single quotes instead of double quotes.