Basics of JSON What is API Introduction to REST API Using cURL to consume Rest API Using Postman to consume Rest API Using Apex to consume Rest API

1. Path to Code
Begin Your Salesforce Coding Adventure

2. Episode 8
Integrate Salesforce using Rest API

3. Salesforce MVP
Sr Technical Architect
23x Certified
@Jitendra Zaa
Speaker

4. Congratulations - MOAR badges - Week 8

5. Agenda
• Basics of JSON
• What is API
• Introduction to REST API
• Using Postman to consume Rest API
• Using cURL to consume Rest API
• Using Apex to consume Rest API

6. Some House Rules
• Please mute your mic
• Keep adding questions in Zoom Q&A Window
• No question is too small
• Questions will be answered in last 15 mins

7. Basics of JSON
● JSON Stands for “JavaScript Object Notation”.
● Language Independent representation of objects
● Parsers widely available in many languages
● Alternative to XML
● JSON can be transmitted over http / https

8. XML vs JSON
<Person>
<FirstName>Foo</FirstName>
<LastName>Bar</LastName>
</person>
{
“FirstName” : “Foo”,
“LastName” : “Bar”
}

9. Advantage of JSON
● XML is Verbose
● More size than of equivalent JSON representation because of
repeated Tags
● JSON Simple to represent
● Recommended for devices with low processing power or slow
internet
● REST is very common and supports JSON widely.
● REST and JSON are the music of the internet.
● Google , Yahoo, D&B web services exposed as REST with
response type JSON

10. JSON Guidelines
Key – Value enclosed in double quotes (String).
Value - can again anything of datatype.
{} – represents Object
[] – represents Array
, - Separates data element within Object
Supports basically four data type:
1.Boolean
2.Number
3.String
4.Object

11. JSON to Apex Class - Deserialization
JSON String :
{
“FirstName” : “Foo”,
“LastName” : “Bar”
}
Equivalent Apex Class:
Class Person
{
public String FirstName;
public String LastName;
}
Person d = (Person )System.JSON.deserialize(jsonString, Person.class);

12. API

13. Stands for “Application Programming
Interface”
API
API
API
SOAP API - XML
REST API - JSON

14. Rest API

15. Representational State Transfer (REST)
Authenticate
Make Request
Process
Response

16. Request Type
• Get
• Get resources
• Post
• Create resources
• Put
• Update existing resource
• Delete
• Delete resources

17. Example 1: Find Stock Rates
• Use Free API From - https://www.alphavantage.co/documentation/
• Authentication done using parameter API Key
• Example -
https://www.alphavantage.co/query?function=GLOBAL_QUOTE&sy
mbol=ibm&apikey=M47PP7VKAUI80TSC

18. Tools Available
• cURL
• Postman
• and many more

19. Sample Apex Code
Http http = new Http();
HttpRequest request = new HttpRequest();
request.setEndpoint('https://www.alphavantage.co/query?func
tion=SYMBOL_SEARCH&keywords=BA&apikey=demo');
request.setMethod('GET');
HttpResponse response = http.send(request);
String body= response.getBody() ;
System.debug(body);

20. Trailhead Modules
Apex Integration Services Lightning Platform API Basics

21. Reference
• JSON vs XML
• Online JSON Editor
• JSON Serialization vs Deserialization
• Free API to check Stock Status

22. Q&A

23. Next Episode 9
Integration 101 - Making SOAP Callout

24. Thanks