Easy APIs Without Authentication

This is a curated list of APIs which do not require usernames, passwords, access tokens, signing, accept-headers, or anything more complicated than sticking a URL in a browser. (This is an update to my post from two years ago.)

When I introduce people to the concept of using RESTful APIs, they immediately get how powerful it is to retrieve information from the Internet and then manipulate it in software.

I used to give Twitter and Flickr as examples - they're both fairly well known and have interesting content. The only problem is that both require authentication. I'm an adult with two decades of programming experience and I still find OAuth-dances tricky! I've no idea how to create a foolproof guide for a child to get authentication tokens. Added to the fact that under-13 year-olds often can't legally enter into agreements with these companies.

So, here's a list of APIs which don't require any authentication. They are free (gratis), fun, and friendly for beginners.

Pokemon API / Star Wars API

The inimitable Paul Hallett has created these two marvellous resources.

Pokéapi - as the name suggests - is a comprehensive database of Pokemon.
Star Wars API - contains information about all the ships, planets, and inhabitants of the Star Wars Universe.

Both are great fun to play with and have excellent documentation.

Wikipedia

@edent Wikipedia?

— Alf Eaton (@invisiblecomma) January 23, 2014

The Wikipedia API is self documenting - although a little intense for a first time programmer. It will also pretty-print the information in a browser - which makes it much more readable to a novice.

Police UK

@edent I'm *slightly* biased here, but http://t.co/87exkeVfD2? : )

— Amanda 🏳️‍🌈🔮 (@ayymanduh) January 23, 2014

Not great for international audiences - but a fantastic resource for students in the UK. All sorts of crime statistics.

Google Books

Google provides a free book search API which is simple to use.

https://www.googleapis.com/books/v1/volumes?q=isbn:0747532699

And you get pretty-printed JSON back with information about the book.

British National Bibliography

A bit niche, but the is ace. You can take a URl like http://bnb.data.bl.uk/doc/resource/007446989 and then add .json or .xml at the end to get the data.

e.g. http://bnb.data.bl.uk/doc/resource/007446989.json

Google Location

Google has a pretty good location API which doesn't require a login.

https://maps.googleapis.com/maps/api/geocode/json?address=Oxford%20University,%20uk&sensor=false

Again, with some pretty printed JSON.

Spotify

Music streamer Spotify has a great API for discovering music.

The results from something like https://api.spotify.com/v1/search?q=bowie&type=artist are pretty printed and fairly easy to decipher.

Apple

Apple are surprisingly friendly. They have a simple API for looking up iTunes content.

Here, for example is all of Beyoncé's music videos.

https://itunes.apple.com/search?term=beyonce&entity=musicVideo

Open Movie Database

Sadly, there's no API for IMDb, but there's is the Open Movie Database API.
https://www.omdbapi.com/?t=star%20wars&y=&plot=short&r=json

Space APIs

There are a handful of Outer Space APIs avilable for free at http://open-notify.org/

Football Data

If you like historical football data, take a look at http://api.football-data.org/code_samples

Open Air Quality

A huge amount of environmental data available for free at https://docs.openaq.org/.

What Else?

I'm sure I've missed loads. If you know of any, please drop a link in the comments.

Remember, the criteria are...

1. No authentication needed.
2. Well structured output.
3. Interesting data.
4. Child friendly.
5. Up to date.
6. Preferably free (libre and gratis).