Object: reference and metadata

object reference

the reference does not guarantee the object's existence. We use the reference to upload data and to download the object.

The object reference exposes properties related to the object's location and exposes related references.

// location (strings)
bucket
fullPath 
name

// reference
parent
root

build a reference

We build the reference by providing the object's name, which is its full path within the bucket. That is, it includes the file extension and the parents' path.

ref(storage, objectName)
ref(storage, "tts/2F1ZqipqaG0Mg....KoFq4Izjv.mp3") // a file name

object metadata

firebase gathers the object's metadata in a FullMetadata object, which exposes properties such as the size, the contentType and the creation date.

// location (strings)
bucket
fullPath
name

// size, type and time
size
contentType
timeCreated

// objects reference
ref

we may fetch the metadata of an existing object:

const metadata = await getMetadata(fileRef);