PortalJS — Add Resource

Overview

Add a resource — an additional file — to a dataset that already exists in a portaljs-catalog portal. Where /portaljs-add-dataset creates a new dataset (one file), this skill adds a file to an existing one: a data dictionary, a methodology document, or another data file (e.g. a second year's figures).

Mirrors the Frictionless Data Package model: a dataset holds a resources[] array, and the showcase at /@<namespace>/<slug> renders one section per resource (preview, schema, download). A single-file dataset migrates to resources[] automatically the first time a second file is added — no data is lost.

Prerequisites

• An existing PortalJS portal (portaljs-catalog template) with datasets.json, package.json, and pages/[owner]/[slug].tsx present.
• The target dataset already registered in datasets.json.
• The new resource's source: a local file path or a public URL, in CSV, TSV, JSON (array), or GeoJSON format.
• Node 18+ installed to run npx next build for verification.

Instructions

The canonical, full step-by-step workflow lives in .claude/commands/portaljs-add-resource.md in this repository — that file is the single source of truth. Read and follow it. Summary:

1. Gather input (interview if thin): DATASET (slug or namespace/slug), SOURCE (path or URL), PORTAL_DIR (default .), RESOURCE_NAME, RESOURCE_TITLE, DESCRIPTION. If DATASET or SOURCE is missing, list datasets from datasets.json and ask.
2. Validate the portal and locate the dataset entry by slug (and namespace, if given). If the dataset does not exist, offer /portaljs-add-dataset instead.
3. Detect the format from extension/Content-Type, fetch (check HTTP status) or confirm the local path exists, then copy into PORTAL_DIR/public/data/ under a non-colliding filename.
4. Update datasets.json: if the dataset has no resources yet, migrate its top-level file/format/schema into the first resource (lossless), then append the new resource; if resources already exists, just append, keeping name unique within the array.
5. Verify the build with npx next build, capturing output to a log file; fix malformed JSON before reporting success.
6. Report the outcome (see Output below).

Output

✓ Resource added to DATASET: RESOURCE_TITLE (RESOURCE_NAME.EXT)
  - Data file: public/data/RESOURCE_NAME.EXT
  - Manifest:  datasets.json (dataset now has <n> resources)
  - Showcase:  /@<namespace>/<slug> renders a section per resource

If this was the first migration to multi-resource, note that the dataset's single file was moved into resources[] with no data lost.

Error Handling

Symptom	Cause	Fix
"Dataset not found"	DATASET slug/namespace doesn't match any entry in datasets.json	List datasets from datasets.json and ask the user to pick, or run /portaljs-add-dataset to create it
npx next build fails with a JSON parse error	Manually edited datasets.json has a trailing comma or unescaped character	Re-open the file, fix the JSON, and rebuild before reporting success
Resource file fails to fetch (non-2xx)	SOURCE URL is wrong, private, or the host is down	Confirm the URL in a browser or with curl -I SOURCE; ask for a corrected URL or a local path
New resource's filename collides with an existing one in /public/data	Auto-derived RESOURCE_NAME matches an existing file stem	Pick a distinct RESOURCE_NAME, or let the skill append a numeric suffix
Showcase doesn't render the new section after build	name in the new resource object duplicates an existing resource's name	Rename the resource's name to something unique within that dataset's resources[]

Examples

Example 1 — Add a data dictionary to a single-file dataset

/portaljs-add-resource orders ./data/orders-data-dictionary.csv --title "Data dictionary"

orders was a single CSV. It is migrated to a two-resource dataset (the original data plus the dictionary), and its showcase now renders a section for each.

Example 2 — Add a resource by URL to a dataset that already has resources

/portaljs-add-resource climate-observations https://example.org/data/methodology.json --name methodology --title "Methodology notes"

The skill fetches the URL, checks the HTTP status, copies it to public/data/methodology.json, and appends it to the existing resources[] array.

Example 3 — Run with no arguments (interview mode)

/portaljs-add-resource

With no arguments, the skill lists datasets from datasets.json, asks which one to extend and for the new file's path or URL, then proceeds through steps 2-6 above.

Resources

• .claude/commands/portaljs-add-resource.md — canonical workflow this skill follows
• references/reference.md — resource entry fields, single-to-multi-resource layout, troubleshooting
• Related skills: /portaljs-add-dataset (create a new dataset), /portaljs-define-schema (describe a resource's fields)
• Frictionless Data — Data Package resources — the data model this feature mirrors