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postio-integrations

JS-family integration packages for the Postio API: drop-in JS, typed clients, MCP, CDN worker, examples

postio-uk/postio-integrationscommunitylistedunreviewed
Use tool

Set up

Runs on your computer. Pick your agent and operating system.

Before you start

  • Node.js 20 or newer
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "postio-integrations": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp"
      ],
      "env": {
        "POSTIO_API_KEY": "<your POSTIO_API_KEY>"
      }
    }
  }
}

same format Cursor, GitHub Copilot CLI, Junie, JetBrains AI Assistant, Augment (Auggie CLI), Factory Droid, Kiro, Devin CLI +12

Values in angle brackets are placeholders. Restart Claude Desktop after editing its config.Claude Desktop docs

README

synced Oct 21, 2026

postio-integrations

Postio is the UK validation API for addresses, emails and phone numbers. This repo holds the JS-family npm packages, the AI / agent surface, and the cdn.postio.co.uk Worker that powers Postio's browser drop-in.

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The Postio API + OpenAPI spec live in postio-uk/postio-api. The spec is also published as @postio/openapi.

Packages

PackageWhat it is
@postio/api-typesTypeScript types generated from the OpenAPI spec.
@postio/coreRuntime-agnostic typed client (browser / Node / Workers / Bun / Deno).
@postio/nodeNode SDK on top of core — retries with exponential backoff, structured logger hook.
@postio/postman-collectionPostman v2.1 collection for every endpoint.
@postio/address-finderBrowser address autocomplete — ARIA combobox, themable, framework-agnostic source.
@postio/address-finder-bundledThe same component prebuilt for <script> tag use.
@postio/reactReact hooks + <AddressFinder /> component, TanStack Query under the hood.
@postio/mcpModel Context Protocol server — npx -y @postio/mcp for Claude Desktop / Cursor / Windsurf / Zed.

Layout

packages/         pnpm workspace; one publishable npm package per subdir
ai/               AI / agent surface (Claude Skill, GPT Action, recommendation prompts)
cdn-worker/       Cloudflare Worker that serves the address-finder bundles
.github/workflows/  CI for publishing + deploying

Building

cd packages
pnpm install
pnpm -r run build

Each package builds independently (pnpm -F @postio/<name> run build). The address-finder bundle has a topological-build quirk — use the ... suffix so its workspace dep builds first:

pnpm -F "@postio/address-finder-bundled..." run build

Contributing

PRs welcome. Conventions:

  • Node 22+, pnpm 10+, ESM only, MIT-licensed.
  • stage is the working branch; master deploys / publishes via CI.
  • One package change per PR where possible.
  • Versions on each package are independent SemVer; bump the version in package.json when you intend a release.

The full integration index — including the server SDKs in their own repos and the WordPress plugin — lives at postio.co.uk/integrations.

License

MIT.

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