Royal Mail PAF address finder API

Address Finder API for Postcode & Address Autocomplete

Add fast UK address search, postcode lookup and address autocomplete to your website, web app, desktop software or bespoke business system using the Simply Postcode Address Finder API.

✓ JSON Open API ✓ Search as you type ✓ Royal Mail PAF data ✓ Geolocation returned ✓ 30-day free trial
View Open API Start Free Trial

Address Finder API flow

1. Search Postcode / words
2. Select Matching address
3. Return Full address + geo

Build postcode lookup, address finder and address autocomplete into almost any programming stack.

Choose the right Address Finder API option

Simply Postcode provides modern and legacy API options for developers who need UK address lookup, postcode search, address autocomplete or Royal Mail PAF address data integration.

Open API

Best for: web app devs.

The recommended Address Finder API for new integrations. Search by postcode, postcode plus address words, or search-as-you-type text.

  • Search as you type, postcode or part address
  • Open API call
  • Full address search
  • Returns JSON Full address and geo-location information
  • Returns geo-location information
  • Good for checkout/signup pages
  • Returns location information
View Open API Examples →
Simply Complete AI

Best for: Quick integration

A fast website address finder option for adding UK address autocomplete to web forms with minimal coding.

  • Search as you type, postcode or part address
  • Simple HTML setup
  • Add one line of code
  • No server technology required
  • Very good mobile experience
  • Use wizard to map fields
  • Returns geo-location information
View Simply Complete AI →
V2

Legacy API Options

Legacy API options are available for older systems, Windows applications and bespoke software that needs established integration methods.

Developer friendly UK address lookup

Build address lookup into websites, apps and business systems

Use the Address Finder API to let users search by postcode, partial address or typed words, then return a selected Royal Mail address record with structured address fields and geolocation.

Read API Documentation Request API Pricing
JSON API JavaScript React Vue Angular Node .NET / C# VB.NET

Address Finder API features

Everything you need to add UK postcode lookup, address search and address autocomplete to your own software.

PAF

Royal Mail PAF data

Use address data based on Royal Mail PAF for accurate UK address capture.

{ }

Modern JSON Open API

Use the V3 Open API with modern websites, web apps and desktop applications.

🔎︎

Postcode and word search

Search by postcode, partial address, or search-as-you-type address words.

🎯

Geolocation included

Return address details with geolocation data when retrieving the selected address record.

↻

Daily updated data

Address data is maintained for you, reducing the need to manage your own database.

UK

UK technical support

Get support from a UK software company used to helping developers and business users.

How the API works

Two-call address lookup process

The recommended V3 Address Finder API uses a simple search and retrieve process. First search for matching addresses, then retrieve the selected full address record.

  1. Search using postcode, postcode plus words, or search-as-you-type text
  2. Display matching address options to the user
  3. Retrieve the selected full address record and geolocation
  4. Populate your web form, app screen, CRM, ERP or business database

Good fit for:

  • Website checkout address lookup
  • Address autocomplete on signup forms
  • CRM and customer portals
  • Accounting and ERP systems
  • Desktop business applications
  • Bespoke web and mobile applications

What is an Address Finder API?

An Address Finder API is a developer interface that lets software search for, validate and retrieve postal addresses. Simply Postcode provides a UK Address Finder API for postcode lookup, Royal Mail PAF address search, address autocomplete and structured address capture in websites, apps and business systems.

Developers can use the Simply Postcode Address Finder API to search for a UK address, present matching results to a user, retrieve the selected address, and populate address fields automatically.

Important keywords covered

  • Address Finder API
  • Royal Mail Address Finder API
  • Postcode Lookup API
  • UK Address Autocomplete API
  • JSON Address Lookup API
  • PAF Address Finder

Why choose Simply Postcode for address lookup?

🗲

Quick to integrate

Use examples and API options to get postcode lookup working quickly.

99%

Reliable service

Designed for business use, with the site stating over 99.99% availability.

0£

No setup charges

Start with a trial and choose the package that fits your website, app or business system.

PC

Desktop options

COM Object and .NET Assembly options are available for Windows desktop software.

WEB

Website options

Use API integration or SimplyCompleteAI to add address finder functionality to web forms.

API

Developer options

Choose modern or legacy API routes depending on your technology stack.

Ready to add an Address Finder API to your software?

Start a free trial, view the V3 Open API documentation, or request a quote for your website, app or bespoke business system.

View Open API Start Free Trial Request a Quote

Prefer to talk? Call us on 01945 464854