The NuGet Server API is a set of HTTP endpoints that can be used to download packages, fetch metadata, publish new packages, and perform most other operations available in the official NuGet clients.

Free and open source REST API that provides a simple yet effective way to validate and format a phone number.

Numverify API is a powerful JSON API providing international and national phone number validation, carrier, location, and line type lookup for developers.

Power your app with Nutritionix data!

Official Joke API!

Secure, scalable, and highly available authentication and user management for any app.

The Open Movie Database

A worldwide open-source brewery dataset and API.

Open Exchange Rates provides a simple, lightweight and portable JSON API with live and historical foreign exchange (forex) rates for over 200 worldwide and digital currencies, via a simple and easy-to-integrate API, in JSON format. Data are tracked and blended algorithmically from multiple reliable sources, ensuring fair and unbiased consistency.

Open Food Facts database, API server and web interface - 🐪🦋 Perl, CSS and JS coders welcome 😊 For helping in Python, see Robotoff or taxonomy-editor

Open Library is an open, editable library catalog, building towards a web page for every book ever published. Read, borrow, and discover more than 3M books for free.

Open APIs From Space.