Postcodes.io

API

Free UK Postcode Lookup & Geolocation API

Overview

Postcodes.io offers RESTful endpoints for UK postcode validation, lookup, and geolocation. Key endpoints include single postcode queries (/postcodes/{postcode}), bulk postcode processing (/postcodes), reverse geocoding (/reverse/geocode) to retrieve postcodes from coordinates, and nearest postcodes (/postcodes/{postcode}/nearest). Responses are JSON-formatted, containing address components, latitude/longitude, local authority, NHS region, and parliamentary constituency data. Ideal for e-commerce address validation, delivery route optimization, location-based app features, and businesses needing UK-specific geospatial insights tied to postcodes.

Example Integration (JavaScript)

script.js JS


fetch('https://postcodes.io')
  .then(res => res.json())
  .then(data => console.log(data))
  .catch(err => console.error(err));

Key Features

RESTful
JSON support
No API key required
Bulk postcode lookup
Reverse geocoding
UK-specific geospatial data

Frequently Asked Questions

? Is Postcodes.io free to use?

Yes, Postcodes.io is completely free for both personal and commercial use with no hidden charges.

? Does Postcodes.io require an API Key?

No, the API does not require any authentication or API key to access its endpoints.

? What is the response format of Postcodes.io?

All responses from Postcodes.io are in JSON format, providing structured data like coordinates, address details, and administrative region information.

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Tool Info

Pricing Free

Category Geocoding

Platform Public API

Pros

⊕ Free for all use cases
⊕ No authentication needed
⊕ Accurate and up-to-date UK data
⊕ Supports bulk and reverse operations

Cons

⊖ Rate limited (100 requests/minute)
⊖ UK-only coverage
⊖ No official service level agreement (SLA)