github.com/hugorut/terraform@v1.1.3/website/docs/language/functions/tostring.mdx (about)

     1  ---
     2  page_title: tostring - Functions - Configuration Language
     3  description: The tostring function converts a value to a string.
     4  ---
     5  
     6  # `tostring` Function
     7  
     8  `tostring` converts its argument to a string value.
     9  
    10  Explicit type conversions are rarely necessary in Terraform because it will
    11  convert types automatically where required. Use the explicit type conversion
    12  functions only to normalize types returned in module outputs.
    13  
    14  Only the primitive types (string, number, and bool) and `null` can be converted to string.
    15  All other values will produce an error.
    16  
    17  ## Examples
    18  
    19  ```
    20  > tostring("hello")
    21  hello
    22  > tostring(1)
    23  1
    24  > tostring(true)
    25  true
    26  > tostring(null)
    27  null
    28  > tostring([])
    29  Error: Invalid function argument
    30  
    31  Invalid value for "v" parameter: cannot convert tuple to string.
    32  ```