> For the complete documentation index, see [llms.txt](https://learnsql.gitbook.io/lernmysql/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://learnsql.gitbook.io/lernmysql/required-headers-for-json.md).

# required headers for json

```
// required headers
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");
```