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These were initially introduced as functions with "encode" and "decode" prefixes, but that doesn't match with our existing convention of putting the encoding format first so that the encode and decode functions will group together in a alphabetically-ordered function list. "text" is not really a defined serialization format, but it's a short word that hopefully represents well enough what these functions are aiming to encode and decode, while being consistent with existing functions like jsonencode/jsondecode, yamlencode/yamldecode, etc. The "base64" at the end here is less convincing because there is precedent for that modifier to appear both at the beginning and the end in our existing function names. I chose to put it at the end here because that seems to be our emergent convention for situations where the base64 encoding is a sort of secondary modifier alongside the primary purpose of the function, as we see with "filebase64". (base64gzip is an exception here, but it seems outvoted by the others.)
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| layout | page_title | sidebar_current | description |
|---|---|---|---|
| functions | base64decode - Functions - Configuration Language | docs-funcs-encoding-base64decode | The base64decode function decodes a string containing a base64 sequence. |
base64decode Function
-> Note: This page is about Terraform 0.12 and later. For Terraform 0.11 and earlier, see 0.11 Configuration Language: Interpolation Syntax.
base64decode takes a string containing a Base64 character sequence and
returns the original string.
Terraform uses the "standard" Base64 alphabet as defined in RFC 4648 section 4.
Strings in the Terraform language are sequences of unicode characters rather than bytes, so this function will also interpret the resulting bytes as UTF-8. If the bytes after Base64 decoding are not valid UTF-8, this function produces an error.
While we do not recommend manipulating large, raw binary data in the Terraform language, Base64 encoding is the standard way to represent arbitrary byte sequences, and so resource types that accept or return binary data will use Base64 themselves, which avoids the need to encode or decode it directly in most cases. Various other functions with names containing "base64" can generate or manipulate Base64 data directly.
base64decode is, in effect, a shorthand for calling
textdecodebase64 with the encoding name set to
UTF-8.
Examples
> base64decode("SGVsbG8gV29ybGQ=")
Hello World
Related Functions
base64encodeperforms the opposite operation, encoding the UTF-8 bytes for a string as Base64.textdecodebase64is a more general function that supports character encodings other than UTF-8.base64gzipapplies gzip compression to a string and returns the result with Base64 encoding.filebase64reads a file from the local filesystem and returns its raw bytes with Base64 encoding.