How It Works
- Bucket naming — Bucket names are globally unique. Use
{app-name}-{project-id-prefix}pattern to avoid collisions. - Load
references/stratus-basics.md— for upload/download/delete patterns, the 250 GB single-upload limit, signed URL generation, and multipart setup. - 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. - 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
expressinstalled 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".
