JavaScript Snippet

Trigger a File Download from a Blob

Difficulty: Medium

Generating a CSV, JSON export, or screenshot client-side and saving it without a server round-trip is a five-line trick: build a `Blob`, mint an object URL, click a hidden `<a download>`, and revoke the URL. This snippet covers the canonical helper, a JSON export wrapper, and the cleanup pattern that prevents memory leaks during long-running sessions.