13 free tools for API design, development, and testing

These free and free-tier services and open-source utilities will have your API up and running in no time

The rise of RESTful APIs has been met by a rise in tools for creating, testing, and managing them. Whether you’re an API newbie or an expert on an intractable deadline, you have a gamut of services to help you bring your API from concept to production, and many of them won’t cost you a dime.

Following is a sampling of free services for working with APIs. Some are quick and dirty applications to ease the job of assembling or testing an API. Others are entry-level tiers for full-blown professional API management services, allowing you to get started on a trial basis and later graduate to a more professional level of (paid) service if and when you need it.