38 lines
1013 B
Markdown
38 lines
1013 B
Markdown
---
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layout: "language"
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page_title: "tostring - Functions - Configuration Language"
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sidebar_current: "docs-funcs-conversion-tostring"
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description: |-
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The tostring function converts a value to a string.
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---
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# `tostring` Function
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-> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
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earlier, see
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[0.11 Configuration Language: Interpolation Syntax](../../configuration-0-11/interpolation.html).
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`tostring` converts its argument to a string value.
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Explicit type conversions are rarely necessary in Terraform because it will
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convert types automatically where required. Use the explicit type conversion
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functions only to normalize types returned in module outputs.
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Only the primitive types (string, number, and bool) can be converted to string.
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All other values will produce an error.
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## Examples
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```
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> tostring("hello")
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hello
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> tostring(1)
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1
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> tostring(true)
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true
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> tostring([])
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Error: Invalid function argument
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Invalid value for "v" parameter: cannot convert tuple to string.
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```
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