portaljs-migrate

Migrate (harvest) datasets between open-data platforms. Reads CKAN, a DCAT-US /data.json catalog (DKAN, ArcGIS Hub, data.gov), a DCAT / DCAT-AP RDF feed (JSON-LD, Turtle, or RDF/XML), Socrata, OpenDataSoft, or an ArcGIS FeatureServer, and writes them to a static PortalJS catalog or pushes them into a CKAN instance over its API. Use when moving datasets from an external open-data platform into a PortalJS portal, or bridging one CKAN instance to another.

v1.0.0
Datopian
MIT

Allowed Tools

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Provided by Plugin

portaljs

Agentic skills for building PortalJS data portals — recommend an architecture, scaffold a portal, add datasets, charts, and maps, connect a CKAN backend, deploy, and audit data quality.

community v0.1.0
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Installation

This skill is included in the portaljs plugin:

/plugin install portaljs@claude-code-plugins-plus

Click to copy

Instructions

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 CKANAPIKEY — 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.

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

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

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

URL and API key authenticate.

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

the reference doc.

  1. 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.

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

CKAN over its action API.

  1. Verify — npm run build (static) or re-query package_search (CKAN).
  2. 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 CKANAPIKEY; 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 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

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

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

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