JSON and REST
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This slide show is from my presentation on what JSON and REST are. It aims to provide a number of talking points by comparing apples and oranges (JSON vs. XML and REST vs. web services).
![http://farm{farm-id}.static.flickr.com/{server-id}/{id}_{secret}_[mstb].jpg](https://image.slidesharecdn.com/jsonandrest-091202051849-phpapp01/85/JSON-and-REST-8-320.jpg)
![REST – Methods Examplehttp://bbddb01/northwind/users[firstname=“rob%”]+ POST = Error + GET = Returns everyone who begins with rob+ PUT = Error+ DELETE = Deletes everyone who begins with robhttp://bbddb01/northwind/users& we add some input data+ POST = Creates a new user+ GET = Returns everyone who meets criteria+ PUT = Creates/Updates a user (based on data)+ DELETE = Deletes everyone who meets criteria](https://image.slidesharecdn.com/jsonandrest-091202051849-phpapp01/85/JSON-and-REST-11-320.jpg)
![REST – Methods Examplehttp://bbddb01/northwind/users[firstname=“rob%”]+ POST = Error + PUT = ErrorWhat would the error be?HTTP 400 or 500 errors are normally used to indicate problems – same as websites](https://image.slidesharecdn.com/jsonandrest-091202051849-phpapp01/85/JSON-and-REST-12-320.jpg)
![FAQ about Security?Are RESTful services secure? It’s a style, not a technology so that depends on how you implement it.Are you open to SQL injection attacks?When you look at http://bbddb01/northwind/users[firstname=“rob%”], you may think so but you shouldn’t be. Because:The parameter shouldn’t be SQLIf it is SQL, why are you not filtering it?Remember the old rule: Do not trust user input](https://image.slidesharecdn.com/jsonandrest-091202051849-phpapp01/85/JSON-and-REST-18-320.jpg)
![JSON – What does it look like?{"firstName": "John","lastName": "Smith","address": {"streetAddress": "21 2nd Street","city": "New York","state": "NY","postalCode": 10021},"phoneNumbers": ["212 555-1234","646 555-4567"]}Name/Value PairsChild propertiesNumber data typeString Array](https://image.slidesharecdn.com/jsonandrest-091202051849-phpapp01/85/JSON-and-REST-22-320.jpg)
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JSON and REST
- 1. The New Kids on the Data Block JSON and REST
- 2. RESTWhat does it stand for?: Representational StateTransfer What Is it?A style of software architecture for distributed systemsWho/Where/When? Came about in 2000 doctoral dissertation of Roy Fielding – but it’s been used for much longer
- 3. REST – Core Principal
- 4. REST – Where/How: Simple ExamplePremise: Data in a table could be a resource we want to read Database server called bbddb01Database called northwindTable called usershttp://bbddb01/northwind/users
- 5. What, What, What?What type of content you return is up to you.Compare to SOAP where you must return XML.Most common are XML or JSON. You could return complex types like a picture.
- 6. REST – Is it used?Web sites are RESTfulRSS is RESTfulTwitter, Flickr and Amazon expose data using RESTSome things are “accidentally RESTful” in that they offer limited support.
- 7. Real Life: Flickr APIResource: PhotosWhere:http://farm{farm-id}.static.flickr.com/{server-id}/{id}_{secret}.jpg
- 9. http://farm{farm-id}.static.flickr.com/{server-id}/{id}_{o-secret}_o.(jpg|gif|png)What: JPEG, GIF or PNG (defined in the URL)http://farm1.static.flickr.com/2/1418878_1e92283336_m.jpg
- 10. REST – MethodsHTTP Methods are a key corner stone in REST. They define the action to be taken with a URL.Proper RESTful services expose all four – “accidental” expose less.Nothing stopping you doing some Mix & MatchSome URL’s offering all of them and others a limited setWhat are the four methods and what should they do?
- 11. REST – Methods Examplehttp://bbddb01/northwind/users[firstname=“rob%”]+ POST = Error + GET = Returns everyone who begins with rob+ PUT = Error+ DELETE = Deletes everyone who begins with robhttp://bbddb01/northwind/users& we add some input data+ POST = Creates a new user+ GET = Returns everyone who meets criteria+ PUT = Creates/Updates a user (based on data)+ DELETE = Deletes everyone who meets criteria
- 12. REST – Methods Examplehttp://bbddb01/northwind/users[firstname=“rob%”]+ POST = Error + PUT = ErrorWhat would the error be?HTTP 400 or 500 errors are normally used to indicate problems – same as websites
- 13. REST – CommandsYou can associate commands with a resource. Commands can replace the need for using HTTP methods and can provide a more familiar way of dealing with data.Example:userResource = new Resource('http://example.com/users/001') userResource.delete()
- 14. Comparing apples and orangesFIGHT: REST vs. SOAP
- 15. REST vs. SOAP – pt I: Technology
- 16. REST vs. SOAP – pt II: Languages
- 17. REST vs. SOAP – pt III: Tools
- 18. FAQ about Security?Are RESTful services secure? It’s a style, not a technology so that depends on how you implement it.Are you open to SQL injection attacks?When you look at http://bbddb01/northwind/users[firstname=“rob%”], you may think so but you shouldn’t be. Because:The parameter shouldn’t be SQLIf it is SQL, why are you not filtering it?Remember the old rule: Do not trust user input
- 19. FAQ about Security?How can I do authentication?It’s built on HTTP, so everything you have for authentication in HTTP is availablePLUSYou could encode your authentication requirements into the input fields
- 20. DEMOBuilding a RESTful database with ADO.NET Data Services
- 21. JSON – What is it?“JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate” – JSON.orgImportantly: JSON is a subset of JavaScript
- 22. JSON – What does it look like?{"firstName": "John","lastName": "Smith","address": {"streetAddress": "21 2nd Street","city": "New York","state": "NY","postalCode": 10021},"phoneNumbers": ["212 555-1234","646 555-4567"]}Name/Value PairsChild propertiesNumber data typeString Array
- 24. DemoJSON Basics
- 25. ADO.NET Data Services & JSONDemo
- 26. More on jQuery?What: jQuery TRWho: ReinWhere: BB&D CollabWhen: 20th May 2009
- 27. Aren’t they the same?FIGHT: JSON vs XML
- 28. JSON vs. XML
- 29. JSON vs. XML which to use?Scenario 1: You have a website (say Twitter.com) and you want to expose a public API to build apps.
- 30. JSON vs. XML which to use?Scenario 2: You have a website (say gmail.com) and your front end needs to show entries from a mailbox, but needs to be dynamic and so you will use a lot of JavaScript.
- 31. JSON vs. XMLWhich of them should you use? Use Both – They both have strengths and weaknesses and you need to identify when one is stronger than the other.