terraform/website/docs/language/functions/tostring.html.md

layout	page_title	sidebar_current	description
language	tostring - Functions - Configuration Language	docs-funcs-conversion-tostring	The tostring function converts a value to a string.

tostring Function

tostring converts its argument to a string value.

Explicit type conversions are rarely necessary in Terraform because it will convert types automatically where required. Use the explicit type conversion functions only to normalize types returned in module outputs.

Only the primitive types (string, number, and bool) and null can be converted to string. All other values will produce an error.

Examples

> tostring("hello")
hello
> tostring(1)
1
> tostring(true)
true
> tostring(null)
null
> tostring([])
Error: Invalid function argument

Invalid value for "v" parameter: cannot convert tuple to string.