Nix supports different types of stores:

Store URL format

Stores are specified using a URL-like syntax. For example, the command

# nix path-info --store --json \

fetches information about a store path in the HTTP binary cache located at, which is a type of store.

Store URLs can specify store settings using URL query strings, i.e. by appending ?name1=value1&name2=value2&... to the URL. For instance,

--store ssh://

tells Nix to access the store on a remote machine via the SSH protocol, using /path/to/my/key as the SSH private key. The supported settings for each store type are documented below.

The special store URL auto causes Nix to automatically select a store as follows: