Postio — UK Address, Postcode, Email & Phone Validation

Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "postio-uk-address-postcode-email-phone-validation": {
      "command": "npx",
      "args": [
        "-y",
        "postio-uk-address-postcode-email-phone-validation"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

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

Package	What it is
`@postio/api-types`	TypeScript types generated from the OpenAPI spec.
`@postio/core`	Runtime-agnostic typed client (browser / Node / Workers / Bun / Deno).
`@postio/node`	Node SDK on top of `core` — retries with exponential backoff, structured logger hook.
`@postio/postman-collection`	Postman v2.1 collection for every endpoint.
`@postio/address-finder`	Browser address autocomplete — ARIA combobox, themable, framework-agnostic source.
`@postio/address-finder-bundled`	The same component prebuilt for `<script>` tag use.
`@postio/react`	React hooks + `<AddressFinder />` component, TanStack Query under the hood.
`@postio/mcp`	Model Context Protocol server — `npx -y @postio/mcp` for Claude Desktop / Cursor / Windsurf / Zed.

Layout

Code

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

bash

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:

bash

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.

Read the full README →View source on GitHub →

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Frequently Asked Questions about Postio — UK Address, Postcode, Email & Phone Validation

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "postio-uk-address-postcode-email-phone-validation": { "command": "npx", "args": ["-y", "Postio — UK Address, Postcode, Email & Phone Validation"] } }

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Technical Specs & Signals

CategoryCommunication

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Adoption & activity1/15

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{ "mcpServers": { "postio-uk-address-postcode-email-phone-validation": { "command": "npx", "args": [ "-y", "postio-uk-address-postcode-email-phone-validation" ] } } }

Documentation Overview

postio-integrations

First time? Sign up free — first 100 lookups on us, no card needed.

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

Packages

Package	What it is
`@postio/api-types`	TypeScript types generated from the OpenAPI spec.
`@postio/core`	Runtime-agnostic typed client (browser / Node / Workers / Bun / Deno).
`@postio/node`	Node SDK on top of `core` — retries with exponential backoff, structured logger hook.
`@postio/postman-collection`	Postman v2.1 collection for every endpoint.
`@postio/address-finder`	Browser address autocomplete — ARIA combobox, themable, framework-agnostic source.
`@postio/address-finder-bundled`	The same component prebuilt for `<script>` tag use.
`@postio/react`	React hooks + `<AddressFinder />` component, TanStack Query under the hood.
`@postio/mcp`	Model Context Protocol server — `npx -y @postio/mcp` for Claude Desktop / Cursor / Windsurf / Zed.

Layout

Code

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

bash

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:

bash

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.

Frequently Asked Questions about Postio — UK Address, Postcode, Email & Phone Validation