Portaljs Add Resource Skill for Claude

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:

• 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.

• 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.

• 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.

• 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.

• Verify the build with npx next build, capturing output to a log file; fix

malformed JSON before reporting success.

• 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