Migrate a whole ArcGIS Hub site into a PortalJS Arc portal end-to-end. Harvests the Hub /data.json (DCAT-US) inventory, exports every FeatureService layer through the ArcGIS REST query API with resultOffset paging, converts each to the serverless dual tier (PMTiles render + GeoParquet query) with tabular items to Parquet, pushes everything to Cloudflare R2 via Git LFS, appends dual-tier datasets.json entries, and writes a source-vs-derived parity report. Use to move a City or sector ArcGIS Hub open-data portal onto PortalJS with no server-side compute.
Migrate a whole ArcGIS Hub site into a PortalJS Arc portal end-to-end. Harvests the Hub /data.json (DCAT-US) inventory, exports every FeatureService layer through the ArcGIS REST query API with resultOffset paging, converts each to the serverless dual tier (PMTiles render + GeoParquet query) with tabular items to Parquet, pushes everything to Cloudflare R2 via Git LFS, appends dual-tier datasets.json entries, and writes a source-vs-derived parity report. Use to move a City or sector ArcGIS Hub open-data portal onto PortalJS with no server-side compute.
Claude Code with PortalJS portals (Next.js 14, React 18/19, Node 18+). Requires native GDAL, tippecanoe, duckdb, and jq on the operator's machine (macOS or Linux/WSL). Runs from any project via the plugin, a personal install, or a portaljs clone.
Migrate an entire ArcGIS Hub open-data site into a PortalJS Arc portal in one pass.
Every Hub site is machine-readable — a DCAT-US catalog at /data.json, with every dataset
backed by an ArcGIS REST FeatureService — so migration is a harvest → export → convert →
publish → verify pipeline that runs almost fully automated on the operator's machine, no
server-side compute. The tooling is the reusable arcgis-to-portaljs migrator: input is one
Hub URL, output is a ready-to-deploy PortalJS catalog plus a parity report.
The skill is an orchestrator: it reuses the DCAT-US harvest from portaljs-migrate, the
ogr2ogr/tippecanoe/duckdb dual-tier conversion from portaljs-add-geo, and the bulk
Git-LFS → R2 push from portaljs-migrate. Its novel parts are the FeatureService REST export
loop (paged features, not just a link) and the source-vs-derived parity report.
Prerequisites
A scaffolded PortalJS portal whose template ships components/MapPreview.tsx and
components/GeoQuery.tsx (PR #1647 or later). Run portaljs-new-portal first if none.
Native CLIs: GDAL (ogr2ogr, ogrinfo), tippecanoe, duckdb (with spatial),
and jq. macOS: brew install gdal tippecanoe duckdb jq; Debian/Ubuntu:
apt-get install gdal-bin duckdb jq plus tippecanoe (apt or build from source); Windows via
WSL. The skill hard-stops with the install hint if any is missing.
Arc credentials for the Git-LFS → R2 push (the token portaljs-deploy resolves), or an OSS
self-hosted Giftless.
Instructions
The canonical, full step-by-step workflow is
.claude/commands/arcgis-to-portaljs.md
— the single source of truth. Read and follow it when executing. Summary:
Gather input — Hub URL, portal directory, project slug, optional flags (--limit,
--only, --dry-run, --namespace-mode). Interview if missing; never dead-end.
Check native tools (ogr2ogr, , + , ). Any missing →
print the per-OS install and stop.
tippecanoe
duckdb
spatial
jq
Validate the portal directory and confirm the geo showcase components exist.
Harvest the Hub /data.json (reuse the portaljs-migrate DCAT-US map) and classify each
item: vector (FeatureService), table, or non-data (web map / 3D / imagery → skipped).
Under --namespace-mode owner, resolve namespaces through a publisher-normalization
table with title-prefix fallback for broken {{source}} publishers (multi-publisher
Hubs ship dirty publisher labels). Dedup near-duplicate hosted-view layers — but only
after a mandatory live record-count check on BOTH twins: equal ⇒ dedup (keep the source
layer, log the pair); different ⇒ keep both as distinct datasets. Consolidate per-year
dataset series into one year-partitioned Parquet with legacy per-year view entries. Enrich
from the AGOL item: sanitized metadata (license/description/dates), cleaned display title
(cleanTitle — raw title still drives the slug), category (item categories → meaningful
theme → keyword mapping), and a thumbnail snapshot into public/thumbnails/.
Export each vector layer through the ArcGIS REST query API with resultOffset paging
(f=geojson, outSR=4326); fall back to keyset paging on transfer limits; accept a
customer File Geodatabase dump for very large layers.
Convert each layer to the dual tier via the portaljs-add-geo recipe (PMTiles +
GeoParquet); tabular items to Parquet. Preserve the native-CRS original.
Publish — bulk Git-LFS track + one push to R2 through Giftless, then append dual-tier
datasets.json entries (upsert on (namespace, slug)).
Write arcgis-parity-report.md — record count, extent, attribute schema, and geometry
validity, source vs derived, per dataset, plus the migrated/skipped/failed accounting.
Report the inventory, migrated datasets, R2 push, and parity summary.
Output
Created:data/<namespace>/<slug>.pmtiles, .parquet, and the original per vector
dataset (all LFS-tracked → R2); Parquet + original per table; arcgis-parity-report.md.
Modified:datasets.json (one dual-tier entry per vector dataset, one resource entry
per table); .gitattributes (LFS tracking).
Verified: the parity report compares each derived artifact to the live FeatureService.
Result:/@<namespace>/<slug> renders <MapPreview> + <GeoQuery> for each vector
dataset with no page edits; the catalog lists everything migrated.
Error Handling
Symptom
Cause
Fix
MISSING_INPUT
No Hub URL provided
Pass the site root (e.g. https://hub-lewisville.opendata.arcgis.com) and retry.
