---
type: "fhirpath-function"
title: "FHIRPath Function: toBoolean"
function: "toBoolean"
category: "Conversion"
section: "5.5.2.1"
source: "fhirpath/functions.json"
---
# FHIRPath Function: toBoolean
_No canonical section match found in index.md._
## Summary
- **Category**: Conversion
- **Section**: `5.5.2.1`
- **Return Type**: `Boolean`
- **Empty Input Result**: `empty`
- **Errors on Multiple Input**: `true`
## Description
If the input collection contains a single item, this function will return a single boolean if the item is a Boolean, an Integer/Decimal with boolean representation, or a String with boolean representation.
## Arguments
- none
## Type Mapping
- `Boolean-Boolean`
- `Integer-Boolean`
- `Decimal-Boolean`
- `String-Boolean`
## Example
```fhirpath
'true'.toBoolean() // returns true
```