keycdn IP Location Finder
Get the IP geolocation data through the simple REST API. All the responses are JSON encoded
UK postcode lookup with lat/lon, district, ward, constituency.
Kiprio UK Postcode API is a free Geocoding API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Get the IP geolocation data through the simple REST API. All the responses are JSON encoded
Yes. The Kiprio UK Postcode API is listed in the Geocoding category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Kiprio UK Postcode API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Kiprio UK Postcode API supports CORS, so front-end JavaScript can call it directly.
Yes. The Kiprio UK Postcode API is served over HTTPS, so it's safe to use in production.