---
type: "fhir-fhirpath-function"
title: "FHIR FHIRPath Function: toString"
source: "source/fhirpath.html"
---

# FHIR FHIRPath Function: toString

This page is part of **FHIR FHIRPath** (FHIR-specific extensions). Base spec lives at [FHIRPath](/fhirpath).

`toString() : string`

If the input collection contains a single item, this function will return a single String if the type is a primitive, and it has a value (e.g. if `hasValue() = true`), and the primitive type has a System type for which [toString() is defined](https://hl7.org/fhirpath/N1/#tostring-string). Otherwise the result is an empty collection.

Patient.birthDate.toString()

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