File metadata in Firebase - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is file metadata in Firebase Storage?

File metadata is information about a file stored in Firebase Storage, such as its size, content type, creation date, and custom tags. It helps describe and manage the file without accessing the file content.

beginner

Name two common default metadata properties stored with a file in Firebase Storage.

Two common default metadata properties are contentType (the file's MIME type like image/png) and size (the file size in bytes).

intermediate

How can you add custom metadata to a file in Firebase Storage?

You can add custom metadata by including a customMetadata object when uploading or updating the file. For example, you can add tags or descriptions as key-value pairs.

beginner

What Firebase Storage method would you use to retrieve metadata of a stored file?

You use the getMetadata() method on a file reference to retrieve its metadata.

beginner

Why is managing file metadata useful in cloud storage?

Managing file metadata helps organize files, control access, track file details, and improve app performance by avoiding downloading files just to get info.

Which property in Firebase Storage metadata tells you the file type?

A contentType

B size

C creationTime

D customMetadata

The contentType property specifies the MIME type of the file, like image/jpeg or text/plain.

How do you update custom metadata for an existing file in Firebase Storage?

A Use getMetadata() method

B Delete and re-upload the file

C Use the updateMetadata() method

D Modify the file content directly

The updateMetadata() method allows you to change metadata without re-uploading the file.

What does the size property in file metadata represent?

A File size in bytes

B Number of downloads

C File creation date

D File owner ID

The size property shows the file size in bytes.

Which of these is NOT a default metadata property in Firebase Storage?

A contentType

B downloadCount

C size

D customMetadata

downloadCount is not a default metadata property in Firebase Storage.

Why might you use custom metadata in Firebase Storage?

A To delete the file

B To change the file content

C To increase file size

D To store extra info like tags or descriptions

Custom metadata lets you add extra information about the file without changing its content.

Explain what file metadata is in Firebase Storage and why it is important.

Think about how metadata helps describe a file without opening it.

Describe how you would add and update custom metadata for a file in Firebase Storage.

Consider the difference between uploading a new file and updating metadata on an existing file.