Template Functions

Templates have access to 200+ functions provided by Sprout, plus a set of specs-specific functions.

Specs functions

Function	Signature	Description
`hostname`	`hostname` → `string`	System hostname
`username`	`username` → `string`	Current OS username
`toBinary`	`toBinary <int>` → `string`	Integer to binary string
`formatFilesize`	`formatFilesize <bytes>` → `string`	Human-readable file size (e.g. `"1.0 MB"`)
`password`	`password <length> <digits> <symbols> <noUpper> <allowRepeat>` → `string`	Generate a secure random password

Default registry: {{ hostname }}.azurecr.io
Author: {{ username }}
Secret key: {{ password 32 4 4 false false }}

Category	Example functions
Strings	`toUpper`, `toLower`, `toPascalCase`, `toSnakeCase`, `toKebabCase`, `trim`, `replace`, `contains`, `repeat`
Encoding	`base64Encode`, `base64Decode`, `toJson`, `fromJson`, `toYaml`, `fromYaml`
Regex	`regexMatch`, `regexFind`, `regexReplaceAll`
Collections	`list`, `dict`, `append`, `prepend`, `uniq`, `keys`, `values`, `merge`
Date & time	`now`, `date`, `dateModify`, `dateAgo`, `duration`
Identity	`uuidv4`, `uuidv5`
Crypto	`sha256sum`, `sha1sum`, `md5sum`, `bcrypt`
Numeric	`add`, `sub`, `mul`, `div`, `mod`, `floor`, `ceil`, `round`
Semver	`semver`, `semverCompare`
Network	`getHostByName`
Random	`randInt`, `randAlpha`, `randAlphaNum`, `randAscii`
Reflection	`typeOf`, `kindOf`, `kindIs`
Environment	`env`, `expandenv` (disabled in `--safe-mode`)
Filesystem	`osBase`, `osDir`, `osExt` (disabled in `--safe-mode`)

Note: Sprout uses Go-convention camelCase names. If you’re migrating from sprig, see the rename table for the full mapping.

Full function reference: docs.gosprout.dev.