> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ubiquex.io/llms.txt
> Use this file to discover all available pages before exploring further.

# ubx console

> Interactive expression REPL for testing ubx expressions and functions.

`ubx console` opens an interactive REPL for evaluating ubx expressions and testing built-in functions without writing a full `.iac` file.

## Usage

```bash theme={null}
ubx console
```

## Examples

```
> lower("HELLO")
"hello"

> cidrsubnet("10.0.0.0/16", 8, 2)
"10.0.2.0/24"

> join("-", ["staging", "eu-west-1", "assets"])
"staging-eu-west-1-assets"

> merge({a = "1"}, {b = "2"})
{ a = "1", b = "2" }

> format("%s-%s", "myapp", "prod")
"myapp-prod"

> :exit
```

## Supported Expressions

* All 30 [built-in functions](/v1/language/functions)
* String interpolation: `"${lower("HELLO")}-bucket"`
* Arithmetic: `2 + 3`, `10 / 2`
* Boolean expressions: `"prod" == "prod"`, `5 > 3`
* List and object literals

## Not Supported in Console

* `~` pending references (no cloud context)
* `input.*` references (no config loaded)
* Block definitions

## Exit

```
> :exit
# or Ctrl+D
```