github.com/rstandt/terraform@v0.12.32-0.20230710220336-b1063613405c/website/docs/configuration/functions/tostring.html.md (about)

     1  ---
     2  layout: "functions"
     3  page_title: "tostring - Functions - Configuration Language"
     4  sidebar_current: "docs-funcs-conversion-tostring"
     5  description: |-
     6    The tostring function converts a value to a string.
     7  ---
     8  
     9  # `tostring` Function
    10  
    11  -> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
    12  earlier, see
    13  [0.11 Configuration Language: Interpolation Syntax](../../configuration-0-11/interpolation.html).
    14  
    15  `tostring` converts its argument to a string value.
    16  
    17  Explicit type conversions are rarely necessary in Terraform because it will
    18  convert types automatically where required. Use the explicit type conversion
    19  functions only to normalize types returned in module outputs.
    20  
    21  Only the primitive types (string, number, and bool) can be converted to string.
    22  All other values will produce an error.
    23  
    24  ## Examples
    25  
    26  ```
    27  > tostring("hello")
    28  hello
    29  > tostring(1)
    30  1
    31  > tostring(true)
    32  true
    33  > tostring([])
    34  Error: Invalid function argument
    35  
    36  Invalid value for "v" parameter: cannot convert tuple to string.
    37  ```