Build on the parcel atlas

npm SDK — @urbankitstudio/atlas

A typed wrapper around the atlas, bundled offline so your code makes no runtime network call to resolve a county. Look up an endpoint by slug or FIPS, read its searchable fields, and build deep-links into the parcel-lookup tool. Works in Node 18+ and every modern bundler.

npm i @urbankitstudio/atlas

A real example

Every function below ships in v0.4.0. findCountyByFips and findCounty return undefined on a miss rather than throwing, so you can branch on the result.

import { findCountyByFips, listStates, atlas } from "@urbankitstudio/atlas";

// 1. Resolve a 5-digit county FIPS to its parcel endpoint.
const kane = findCountyByFips("17089"); // Kane County, IL
if (kane) {
  const endpoint = kane.endpoints[0];
  console.log(endpoint.url);          // the live ArcGIS REST URL
  console.log(endpoint.searchFields); // [{ name: "PIN", searchable: true }, ...]
}

// 2. Discovery: which states are indexed, and how many counties each.
const populated = listStates().filter((s) => s.populated);
console.log(populated.length, "states");

// 3. Coverage totals are on the bundled atlas root.
console.log(atlas.totals); // { states, counties, endpoints }

// Unknown / malformed input returns undefined — it never throws.

MCP server — for AI agents

If your client speaks the Model Context Protocol, point it at our endpoint and the parcel atlas becomes six callable tools: find_parcel_by_address, geocode_address, list_indexed_states, list_counties_in_state, find_county_by_fips, and get_county_endpoint. The server is public and read-only. Your client pays its own LLM-token cost; there is no key to manage on our side.

Claude Desktop config

Open claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/; Windows: %APPDATA%\Claude\) and merge in this block, then restart Claude Desktop.

{
  "mcpServers": {
    "urbankit-atlas": {
      "url": "https://urbankitstudio.com/api/mcp"
    }
  }
}

The full MCP server page has the per-tool reference, JSON-RPC payload examples, a curl walkthrough, and setup notes for Cursor and other clients.

SDK or MCP — which one?