ZIPReader | Godot Docs 4.4

This class implements a reader that can extract the content of individual files inside a ZIP archive. See also ZIPPacker.
# Read a single file from a ZIP archive.
func read_zip_file():
    var reader = ZIPReader.new()
    var err = reader.open("user://archive.zip")
    if err != OK:
        return PackedByteArray()
    var res = reader.read_file("hello.txt")
    reader.close()
    return res

# Extract all files from a ZIP archive, preserving the directories within.
# This acts like the "Extract all" functionality from most archive managers.
func extract_all_from_zip():
    var reader = ZIPReader.new()
    reader.open("res://archive.zip")

    # Destination directory for the extracted files (this folder must exist before extraction).
    # Not all ZIP archives put everything in a single root folder,
    # which means several files/folders may be created in `root_dir` after extraction.
    var root_dir = DirAccess.open("user://")

    var files = reader.get_files()
    for file_path in files:
        # If the current entry is a directory.
        if file_path.ends_with("/"):
            root_dir.make_dir_recursive(file_path)
            continue

        # Write file contents, creating folders automatically when needed.
        # Not all ZIP archives are strictly ordered, so we need to do this in case
        # the file entry comes before the folder entry.
        root_dir.make_dir_recursive(root_dir.get_current_dir().path_join(file_path).get_base_dir())
        var file = FileAccess.open(root_dir.get_current_dir().path_join(file_path), FileAccess.WRITE)
        var buffer = reader.read_file(file_path)
        file.store_buffer(buffer)