Open Source APIs

List of some free open source web APIs available on the RapidAPI marketplace.
Top 50 Most Popular APIs on RapidAPI (2019)RapidAPI blog
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Open Source APIs

Best Open Source APIs for Testing

What is an open source API?

An open API (often referred to as a public API) is a publicly available application programming interface that provides developers with programmatic access to a proprietary software application or web service. APIs are sets of requirements that govern how one application can communicate and interact with another. - Wikipedia

Where can you find open source APIs?

Here are a few places you can find open source APIs:

How to Get Started

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Install SDK for (Node.js)Unirest

OAuth2 Authentication
Client ID
Client Secret
OAuth2 Authentication