When a browser visits a Web site, the page that's sent back over the Internet is preceded by a pre-amble known as the HTTP header. As it turns out, the same sort of pre-amble precedes a Web API's response. As this 101-level tutorial, shows, it includes a hint about how the API formats its data.
This article features ProgrammableWeb's Top 10 Weather APIs, selected on a variety of metrics, including PW followers, GitHub and Twitter activity, and recent news. Our Top Weather and Climate APIs include but are not limited to, BloomSky, AccuWeather, Open Weather Map, and Weather Underground.