# Share settings with ENV and the [key] syntax
> Register values with ENV() and use them in URLs and component configuration with the [key] placeholder.
Framework: jcomponent20
Product: jComponent 20 (jcomponent@20)
Language: en
Content-SHA256: bc463ba39c988765498f2434cfafd091e63bc7d3b4acc44df26da46b70c5b105
Snapshot: c0700e321579725c5cf4f5ace1ad7d2866d1b4f93c24a63c0b41b6b7998e976c
Sources: jcomponent20@3fedd009a277f50fddc608b97afbec553b67c51b
Review: not-recorded
`ENV(name, value)` registers a value for the whole page and `ENV(name)` reads it. Wherever jComponent accepts a text that may contain `[name]` (for example the URL of `AJAX()` and `IMPORT()`), the placeholder is replaced with the value, so you set the address of your API in one place. `'[name]'.env()` does the same replacement on any string.
```html public/index.html
jComponent
```