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Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.
About
Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.
Security Report
This is a well-structured monorepo for Postio, a UK validation API client library with TypeScript support and MCP integration. The codebase demonstrates solid security practices with proper API key handling via environment variables, no hardcoded secrets, and appropriate input validation. Minor code quality observations exist but do not create security vulnerabilities. The MCP server appropriately requires API keys and limits its scope to validation operations. Supply chain analysis found 1 known vulnerability in dependencies (0 critical, 1 high severity). Package verification found 1 issue (1 critical, 0 high severity).
7 files analyzed · 6 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
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Unverified package source
We couldn't verify that the installable package matches the reviewed source code. Proceed with caution.
What You'll Need
Set these up before or after installing:
Environment variable: POSTIO_API_KEY
Environment variable: POSTIO_BASE_URL
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"uk-co-postio-postcode-address-validation": {
"env": {
"POSTIO_API_KEY": "your-postio-api-key-here",
"POSTIO_BASE_URL": "your-postio-base-url-here"
},
"args": [
"-y",
"postio-cdn-worker"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
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.
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
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.
stageis the working branch;masterdeploys / publishes via CI.- One package change per PR where possible.
- Versions on each package are independent SemVer; bump the version
in
package.jsonwhen 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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