# Formatting reference Docker uses [Go templates](https://golang.org/pkg/text/template/) to allow users manipulate the output format of certain commands and log drivers. Each command a driver provides a detailed list of elements they support in their templates: - [Docker Images formatting](../reference/commandline/images.md#formatting) - [Docker Inspect formatting](../reference/commandline/inspect.md#examples) - [Docker Log Tag formatting](logging/log_tags.md) - [Docker Network Inspect formatting](../reference/commandline/network_inspect.md) - [Docker PS formatting](../reference/commandline/ps.md#formatting) - [Docker Volume Inspect formatting](../reference/commandline/volume_inspect.md) - [Docker Version formatting](../reference/commandline/version.md#examples) ## Template functions Docker provides a set of basic functions to manipulate template elements. This is the complete list of the available functions with examples: ### Join Join concatenates a list of strings to create a single string. It puts a separator between each element in the list. $ docker ps --format '{{join .Names " or "}}' ### Json Json encodes an element as a json string. $ docker inspect --format '{{json .Mounts}}' container ### Lower Lower turns a string into its lower case representation. $ docker inspect --format "{{lower .Name}}" container ### Split Split slices a string into a list of strings separated by a separator. # docker inspect --format '{{split (join .Names "/") "/"}}' container ### Title Title capitalizes a string. $ docker inspect --format "{{title .Name}}" container ### Upper Upper turms a string into its upper case representation. $ docker inspect --format "{{upper .Name}}" container