Portaljs Migrate Skill for Claude

PortalJS — Migrate

Overview

Harvest datasets from an external open-data platform into a PortalJS portal, or

push them into a CKAN instance. Every source reads into one canonical shape —

{ slug, namespace, name, description, resources[] } — then writes to the target

from that shape, so adding a source covers every target automatically.

Supported sources: CKAN, a DCAT-US /data.json catalog (DKAN, ArcGIS Hub,

data.gov), a DCAT / DCAT-AP RDF feed, Socrata, OpenDataSoft, or an ArcGIS

FeatureServer/MapServer. Supported targets: a static PortalJS catalog

(datasets.json, resources linked by URL or downloaded into Cloudflare R2) or a

CKAN instance over its write API.

This is the copy-into-the-portal path, the inverse of /portaljs-connect-ckan

(which reads the source live at build time): a one-time, re-runnable snapshot so

the portal stands alone and needs no backend.

Prerequisites

• An existing PortalJS portal for the static target: datasets.json,

package.json, and pages/[owner]/[slug].tsx must exist (the portaljs-catalog

template).

• Node 18+ and npm, with portal dependencies installed (npm install).
• Network access to the source platform's API or feed URL.
• For a CKAN target: a write API key in CKAN_API_KEY — never hardcoded.
• For download copy mode: git-lfs and a PortalJS Arc account (or a

self-hosted Giftless endpoint) to push resource files to R2.

• For dcat-rdf sources: lib/metadata/dcat-harvest.ts and dcat-profiles.ts

(copy from examples/portaljs-catalog/lib/metadata/ if missing), run via npx tsx.

Instructions

Full step-by-step workflow:

.claude/commands/portaljs-migrate.md.

• Gather input — source type, source URL, target (static/ckan), portal

directory, copy mode (link/download), filters. Interview instead of erroring.

• Validate the target — confirm the static catalog files exist, or that the CKAN

URL and API key authenticate.

• Detect the source type from the URL (or --source) and verify reachability.
• Read the source into canonical dataset entries, per the source's field table in

the reference doc, applying the metadata hygiene rules (license sentinel — never

fabricate CC-BY; description sanitizer + fallback chain; source dates preserved

with migratedAt separate; cleanTitle display-name cleanup with slugs from the

raw title; category from a meaningful theme).

• For a static target, resolve resource paths by copy mode: link keeps source

URLs; download copies files into the repo under Git LFS, pushed to R2.

• Print a dry-run preview; stop if --dry-run was passed.
• Write datasets.json (upsert or --replace), or push packages/resources into

CKAN over its action API.

• Verify — npm run build (static) or re-query package_search (CKAN).
• Report datasets migrated, namespaces touched, and next steps.

Output

Static target: an updated datasets.json (upserted on (namespace, slug)),

optionally with resource files in Git LFS served from Cloudflare R2, plus a

passing npm run build. CKAN target: created/updated packages and resources;

per-dataset failures are logged and skipped, not fatal.

Error Handling

| Symptom | Cause | Fix |

| --- | --- | --- |

| "not a portaljs-catalog template" | datasets.json missing | Confirm the portal directory, or run /portaljs-new-portal |

| CKAN target rejects every write (403) | Key missing, expired, or lacks org permission | Set a valid CKAN_API_KEY; stop rather than partially migrating |

| Source URL matches no known format | Auto-detection failed | Pass --source explicitly (ckan, dcat, dcat-rdf, socrata, ods, arcgis) |

| DCAT-RDF fetch returns HTML, not a feed | URL is a portal page, not the feed | Follow its <link rel="alternate"> href, or use the direct feed URL |

| Build fails after write | Malformed entry (missing slug/namespace/name) | Inspect /tmp/portaljs-migrate-build.log, fix, rebuild |

| download mode push fails | git-lfs missing, or no Arc/Giftless token | Install git-lfs; mint a token via the Arc API or self-hosted Giftless |

| Duplicate datasets after re-running | --replace used unintentionally, or slug collisions | Omit --replace to upsert; keep slugs unique per namespace |

Examples

Example 1 — CKAN to static catalog, link mode

/portaljs-migrate --source ckan --source-url https://demo.dev.datopian.com \
  --target static --portal-dir . --copy-mode link

Upserts all packages from the CKAN demo instance into datasets.json, referencing

source resource URLs directly.

Example 2 — data.gov DCAT-US catalog, downloaded into R2

/portaljs-migrate --source dcat --source-url https://catalog.data.gov/data.json \
  --target static --copy-mode download --org-filter epa-gov

Harvests one publisher and copies every resource file into the repo under Git

LFS, served from Cloudflare R2.

Example 3 — DCAT-AP RDF feed from a national portal

/portaljs-migrate --source dcat-rdf \
  --source-url https://data.europa.eu/api/hub/search/catalog.jsonld \
  --target static --dry-run

Fetches the JSON-LD feed through the RDF harvester and previews the canonical

datasets without writing anything.

Example 4 — CKAN to CKAN (platform-to-platform)

/portaljs-migrate --source ckan --source-url https://old-portal.example.org \
  --target ckan --target-url https://new-portal.example.org --owner-org research

Pushes every package from the old CKAN instance into the new one, filed under

research.

Resources

• Command source: .claude/commands/portaljs-migrate.md
• Field mappings and troubleshooting: references/reference.md
• Related skills: /portaljs-connect-ckan, /portaljs-add-dcat,

/portaljs-check-data-quality, /portaljs-define-schema

• CKAN Action API reference: https://docs.ckan.org/en/latest/api/