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tostring Function
Note: This page is about Terraform 0.12 and later. For Terraform 0.11 and earlier, see 0.11 Configuration Language: Interpolation Syntax.
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) can be converted to string. All other values will produce an error.
» Examples
> tostring("hello")
hello
> tostring(1)
1
> tostring(true)
true
> tostring([])
Error: Invalid function argument
Invalid value for "v" parameter: cannot convert tuple to string.