Baseline 2023
Newly available
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is only available in Dedicated Web Workers.
The truncate() method of the FileSystemSyncAccessHandle interface resizes the file associated with the handle to a specified number of bytes.
Note: In earlier versions of the spec, close(), flush(), getSize(), and truncate() were wrongly specified as asynchronous methods, and older versions of some browsers implement them in this way. However, all current browsers that support these methods implement them as synchronous methods.
newSize
The number of bytes to resize the file to.
None (undefined).
InvalidStateError DOMException
Thrown if the associated access handle is already closed, or if the modification of the file's binary data otherwise fails.
QuotaExceededError DOMException
Thrown if the newSize is larger than the original size of the file, and exceeds the browser's storage quota.
TypeError
Thrown if the underlying file system does not support setting the file size to the new size.
async function truncateFile() {
// Get handle to draft file
const root = await navigator.storage.getDirectory();
const draftHandle = await root.getFileHandle("draft.txt", { create: true });
// Get sync access handle
const accessHandle = await draftHandle.createSyncAccessHandle();
// Truncate the file to 0 bytes
accessHandle.truncate(0);
// Persist changes to disk.
accessHandle.flush();
// Always close FileSystemSyncAccessHandle if done.
accessHandle.close();
}
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