Rest api with node js and express
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The document discusses RESTful APIs with Node.js and Express. It begins with an introduction to APIs and contrasts REST and SOAP APIs. It then discusses Node.js and how it enables non-blocking asynchronous I/O. Finally, it provides a basic example of creating an Express server to respond with "Hello World" and discusses how Node.js handles threads without blocking.
Rest api with node js and express
- 1. RESTful API with Node JS and Express
- 2. Agenda ▷ What is API? ▷ Contrasting common types of APIs ▷ What is Node JS and Express? ▷ Installing Express ▷ Coding Session ▷ Q & A ▷ Workshop
- 4. “An API is a precise specification of the programming instruction and standards to access a web based software or web tool acting as a link between the programmer and the application.
- 5. What is an API? ▷ Acronym for Application Program Interface. ▷ Acts as a bridge between the programmer and application. ▷ Takes specific requests predefined when created. ▷ Verifies the requests and then processes the data. ▷ Gives detailed info on what and how the request are to be made.
- 6. REST APIs
- 7. ▷ REST stands for Representational State Transfer. (ReST) ▷ It is not a framework but Architectural Principle. ▷ Uses HTTP requests which is oriented around verbs and resources ( GET, POST, PUT, DELETE) ▷ The verbs are applied to resources ( data ) POST something to database. GET something from Users. DELETE something from clients. ▷ The request consist of Headers, body and methods. ▷ The response consists of Status Code, Headers and the body. ▷ Caching and Stateless. ▷ Data represented mostly through HTML / XML / JSON. REST APIs
- 8. Contrasting types of APIs REST ▷ Stands for Representational State Transfer. ▷ Is an Architectural principle. ▷ Permits different data formats. ▷ Better Performance and Scalability. ▷ Supports Caching . ▷ Limited to single HTTP transaction. Expects user to retry if something fails. ▷ Used in all type of system apart from some where high security risk are present. SOAP ▷ Stands for Simple Object Access Protocol. ▷ Is a protocol. ▷ Permits only XML. ▷ Scalable but at a very minimum level. ▷ Doesn’t support caching. ▷ Can ensure ACID transactions. ▷ Used mostly in High risk enterprise softwares and banking softwares.
- 9. About Node.js Node.js is not a silver-bullet new platform that will dominate the web development world. Instead, it’s a platform that fills a particular need
- 10. What is challenge in web development? Thread handling.
- 11. Why Node.JS ? Open Source Non - Blocking Large community
- 12. Asynchronous I/O
- 13. Blocking&Non-BlockingCode Blocking Code Example var fs = require("fs"); var data = fs.readFileSync('input.txt'); console.log(data.toString()); console.log("Program Ended"); Output Everything in the file input.txt Program Ended Non-Blocking Code Example var fs = require("fs"); fs.readFile('input.txt', function (err, data) { if (err) return console.error(err); console.log(data.toString()); }); console.log("Program Ended"); Output Program Ended Everything in the file input.txt
- 14. BasicExample var http = require("http"); http.createServer(function(request, response){ response.writeHead(200, {'Content-Type': 'text/html'}); response.end('<h1>Hello World</h1>'); }).listen(1234); console.log("Server running at port 1234");
- 16. ThankYou