---
title: "toBoolean"
description: "Tries to convert value to a boolean"
---

# toBoolean

> Tries to convert value to a boolean

**This function is used by Ignition's Expression language.**.

## Description
Tries to convert value to a boolean, according to these rules:

* If value is a number, 0 is false and anything else is true.
* If value is a string, then the strings (case insensitive) "on", "true", "t", "yes", "y" are all true. The strings (case insensitive) "off", "false", "f", "no", "n" are considered false. If the string represents a number, the first rule applies. All other strings fail type casting.
* All other types fail type casting.

If type casting fails, an error is thrown, unless the failover argument is specified, in which case it will be used.

## Syntax
`toBoolean(value[, failover])`

- Parameters

    - object **value** - The value to type cast.

    - object **failover** - Optional. The failover value if type casting fails.

- Results

    - Bool - The value type cast as a bool.

## Examples
```python title="Code Snippet"
toBoolean(1) //returns true
```
```python title="Code Snippet"
toBoolean("abc", false) //returns false
```