Catalyst Stratus

How It Works

1. Bucket naming — Bucket names are globally unique. Use {app-name}-{project-id-prefix} pattern to avoid collisions.
2. Load `references/stratus-basics.md` — for upload/download/delete patterns, the 250 GB single-upload limit, signed URL generation, and multipart setup.
3. Large files — Multipart upload is recommended (not required) for files ≥ 100 MB. Single-shot upload supports up to 250 GB per object. Load the multipart section of stratus-basics.md.
4. Signed URLs — For user-facing direct downloads/uploads, generate a signed URL server-side and return it to the client.

Response Syntax Default

When writing function code that returns a Stratus result to the client, default to native Node.js response syntax — not Express. Advanced I/O exposes raw http.ServerResponse; res.status() and res.json() do not exist unless the user explicitly chose the Express template.

• Native (default): res.writeHead(200, { 'Content-Type': 'application/json' }); res.end(JSON.stringify(data));
• Express (opt-in only): only if the user has express installed and wired as middleware

Triggers

Use this skill for: "Stratus", "object storage", "file storage", "upload file", "download file", "signed URL", "pre-signed URL", "multipart upload", putObject, getObject, "bucket", "Stratus bucket", "store files on Catalyst", "Stratus vs File Store", "250GB limit", or "file download link".

References