| --- |
| page_title: tobool - Functions - Configuration Language |
| description: The tobool function converts a value to boolean. |
| --- |
| |
| # `tobool` Function |
| |
| `tobool` converts its argument to a boolean 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 boolean values, `null`, and the exact strings `"true"` and `"false"` can be |
| converted to boolean. All other values will produce an error. |
| |
| ## Examples |
| |
| ``` |
| > tobool(true) |
| true |
| > tobool("true") |
| true |
| > tobool(null) |
| null |
| > tobool("no") |
| Error: Invalid function argument |
| |
| Invalid value for "v" parameter: cannot convert "no" to bool: only the strings |
| "true" or "false" are allowed. |
| |
| > tobool(1) |
| Error: Invalid function argument |
| |
| Invalid value for "v" parameter: cannot convert number to bool. |
| ``` |
