What's an API and why do you need one.

1. APIs
(for beginners)

2. 1. API Basics
2. How does it work
3. Demo
4. Webhooks

3. Application
Programming
Interface

4. APIs expose
something useful

5. An Interface

6. Used by a Program

7. To interact with
an Application

8. No (direct)
human usage
of APIs

9. Developers
write Programs
which consumes APIs

10. API Consumption

11. Web APIs

13. API
API
API
API

14. Web-101

15. Web-101

16. Web-101

17. Web-101

18. Human interface
Readable content
HTML / CSS

19. API

20. Programming interface
Structured data
{"richestPeople":[
{"firstName":"Bill", “lastName":"Gates", “value":"81"},
{"firstName":"Carlos", “lastName":"Slim", “value”:"79"},
{"firstName":"Warren", “lastName":"Buffet", "value":"72"}
]}

21. Let’s compare
https://api.github.com/users/devitagus
https://github.com/devitagus
Github website
Github API

22. Let’s play with Facebook graph API

23. Daily life
examples

24. Maps

25. Maps

26. Google Maps API

27. Login

28. Aggregators

29. Payments

30. Twilio API

31. UBER
Shares of Twilio (NYSE:TWLO) have more than quadrupled from its IPO price of $15.

32. Favspot

33. http://www.programmableweb.com/category/all/apis

34. As a developer,

35. I want to show venues
of next gigs in town on
a map

36. Timeout content manager
will enter venue addresses

37. Timeout content manager
doesn’t know
GPS coordinates of venues

38. There’s an API for that

39. Google Geocoding API
developers.google.com/maps/documentation/geocoding/

40. 10 Downing St, London

41. 10 Downing St, London
{
"location" : {
"lat" : 51.5034066,
"lng" : -0.1275923
}
} This is called JSON

42. How does it work?

43. API call is an HTTP request
https://maps.googleapis.com/maps/api/geocode/json?address=10 Downing St, London

46. Are we done?

47. We should now
integrate the
Google Maps API

48. http://maps.google.com/maps?
q=51.503066,-0.1275923

49. I want the app to
send text messages
if a gig is cancelled

50. Let’s look at some code

51. Step 1 - Sign up to Twilio

52. Step 2 - Fetch credentials

53. Step 3 - Write some ruby
require 'twilio-ruby'
account_sid = 'AC__________'
auth_token = '_____________'
client = Twilio::REST::Client.new(account_sid, auth_token)
client.messages.create(
from: '+336123456789',
to: '+3370000000000',
body: 'Hi buddy, you should attend Le Wagon!'
)

54. Step 4 - Run code

55. Your program sent a text!

56. WEBHOOKS
(API )-1

57. Don’t call us, we’ll call you

59. Webhook vs API call
API My app
API Call

60. Webhook vs API call
API My app
WEBHOOK
API Call

61. EXAMPLE

62. Typeform, please
call notify me as soon
a new member applied
Webhook

63. Typeform to capture leads
Slack for my sales team
Lead Management

64. API
Service B exposes methods
to read, create or update data

65. WEBHOOK
Typeform pushes data
as soon as available
API
Slack exposes methods
to read, create or update data

66. Introducing Zapier

67. Demo

68. When you’ll hit
Zapier's limit, come
learn to code at
Le Wagon!

69. Thank you!