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![SCHEMA Define the format of a document with a schema : varStudentSchema=newmongoose.Schema({ name:String, age:Number course:[String], address:{ city:String, country:String } }); varStudent=mongoose.model('Student',StudentSchema);](https://image.slidesharecdn.com/release20150329-150329151641-conversion-gate01/75/Use-Node-js-to-create-a-REST-API-27-2048.jpg)
![CREATE OR UPDATE ITEM varstudent=newStudent({ name:'Serge', age:23, course:['AngularJS','Node.js'], address:{ city:'Paris', country:'France' } }); student.save(function(err){ if(err)returnconsole.log('notsaved!'); console.log('saved'); });](https://image.slidesharecdn.com/release20150329-150329151641-conversion-gate01/75/Use-Node-js-to-create-a-REST-API-28-2048.jpg)
Uploaded byFabien Vauchelles
Use Node.js to create a REST API
This document provides an introduction and overview of Node.js, including what Node.js is, its architecture and basics, how to write "Hello World" programs in Node.js and Express, how to use modules, errors, middleware, routers, Mongoose and MongoDB for databases, and the MEAN stack. It also describes a tutorial for building a backend API with Node.js, Express, Mongoose and MongoDB.
In this document
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Introduction to Node.js as a JavaScript engine, created by Ryan Dahl in 2009, using Chrome V8 Engine.
Basics of Node.js with a focus on its single-threaded architecture, event loop, and non-blocking I/O characteristics.
Demonstration of a simple Node.js program to print 'HelloWorld!' using console.log.
How to load core and custom modules in Node.js, including example code to create and use a custom module.
Introduction to the error-first callback pattern in Node.js, illustrating with code on reading files.
Introduction to Express as a fast and minimalist web framework designed for Node.js applications.
Basic Express app creation that returns 'HelloWorld!' on a GET request, with installation command for Express.
Explanation of middleware functions in Express, including their role in request/response handling and standard middleware examples.
How to implement routing in Express for modular code management and examples of setting up routes.
Introduction to Mongoose as a Node.js MongoDB connector and its significance in database operations.
Examples of connecting to MongoDB, defining schemas, and CRUD operations using Mongoose.
Discussion on the MEAN stack which includes MongoDB, Express, AngularJS, and Node.js.
Overview of the project structure for a MEAN stack application, detailing main files and their functions.
Detailed routing example in a MEAN application, outlining steps to define routes and models.
Recommendation to utilize Postman for testing APIs developed with Node.js.
Step-by-step tutorial including setting up the project, creating a server, and defining routes with Mongoose.
Final implementation steps in the tutorial, including using Mongoose for CRUD operations and finalizing the project.
Use Node.js to create a REST API
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- 3. WHAT IS NODE.JS? Node.JS is the Javascript engine of Chrome, port to be used from the command line.
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- 8. HELLO WORLD INNODE.JS hello.js console.log('HelloWorld!'); $nodehello.js >HelloWorld!
- 9. DON'T FORGET THEDEMO.DON'T FORGET THE DEMO.
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- 12. YOU PREPARE ADEMO,YOU PREPARE A DEMO, DON'T U ?DON'T U ?
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- 15. WHAT IS IT? "Fast, unopinionated, minimalist web framework for Node.js" (expressjs.com)
- 16. HELLO WORLD INEXPRESS varexpress=require('express'); varapp=express(); app.get('/',function(req,res){ res.send('HelloWorld!'); }); app.listen(9001); Don’t forget: $npminstallexpress
- 17. LIVE DEMO ?LIVEDEMO ?
- 18. MIDDLEWARE / WHAT? Middlewares can : make changes to the request and the response objects end the request
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- 20. MIDDLEWARE / STANDARDMODULES body‐parser Parse request body and populate req.body cookie‐parser Parse cookie header and populate req.cookies cors Allow CORS requests errorhandler Send a full stack trace of error to the client. Has to be last express.static Serve static content from the "public" directory (html, css, js, etc.) method‐override Lets you use PUT and DELETE where the client doesn't support it
- 21. ROUTER / HELLOWORLD api‐hello.js varexpress=require('express'); varrouter=express.Router(); router.get('/',function(req,res){ res.send('HelloWorld!'); }); module.exports=router; index.js varexpress=require('express'); varapp=express(); //Routes app.use('/hello',require('./api-hello')); app.listen(9001);
- 22. CHOOSE THE DEMOPILL !CHOOSE THE DEMO PILL !
- 23. ROUTER / WHY? Routers help to split the code in modules
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- 25. WHAT IS IT? Mongoose is a Node.js connector for MongoDB.
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- 28. CREATE OR UPDATEITEM varstudent=newStudent({ name:'Serge', age:23, course:['AngularJS','Node.js'], address:{ city:'Paris', country:'France' } }); student.save(function(err){ if(err)returnconsole.log('notsaved!'); console.log('saved'); });
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- 32. WHAT IS IT? MEAN stands for : MongoDB Express framework AngularJS NodeJS
- 33. PROJECT STRUCTURE root |-api :allroutesandprocessing |-thing.js:anrouteexample |-node_modules :externallibrairies |-index.js :configurationandmainapplication |-package.json :listofexternallibrairies
- 34. INDEX.JS 4 parts : 1. Connect to the Database 2. Configure Express framework 3. Define routes 4. Start the server
- 35. HE HAS PROMISEDUSHE HAS PROMISED US AN EXAMPLE, RIGHT?AN EXAMPLE, RIGHT?
- 36. ROUTE EXAMPLE 1. Define routes 2. Define model 3. Define processing
- 37. DID HE FORGETDIDHE FORGET THE EXAMPLE ?THE EXAMPLE ?
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- 42. TUTORIAL / GETTHE PROJECT GET THE PROJECT $gitclonehttps://github.com/fabienvauchelles/stweb-angularjs-tutorial.git $cdstweb-angularjs-tutorial/backend
- 43. TUTORIAL / SERVER GETTHE NEXT STEP $gitreset--hardq15 $npminstall CREATE A SERVER Fill backend/app.js
- 44. TUTORIAL / FIRSTROUTE GET THE NEXT STEP $gitreset--hardq16 CREATE THE 'FINDALL' ROUTE 1. Create a findAll function (node format) to return a list of article 2. Add findAll to the router 3. Add the articles route to backend/app.js
- 45. TUTORIAL / ROUTE'CREATE' GET THE NEXT STEP $gitreset--hardq17 CREATE THE 'CREATE' ROUTE 1. Create a create function (node format) to create an article from req.body 2. Add create to the router (HTTP POST)
- 46. TUTORIAL / ROUTE'DELETE' GET THE NEXT STEP $gitreset--hardq18 CREATE THE 'DELETE' ROUTE 1. Create a destroy function (node format) to remove an article (id in the url) 2. Add destroy to the router (HTTP DELETE)
- 47. TUTORIAL / IMPORTDATA START MONGODB In a new shell : $mongod
- 48. TUTORIAL / MONGOOSE GETTHE NEXT STEP $gitreset--hardq19 IMPORT DATA $mongoimport--dbpostagram--collectionarticles --filearticles-init.json ADD MONGOOSE TO THE PROJECT $npminstallmongoose--save
- 49. TUTORIAL / CONNECT GETTHE NEXT STEP $gitreset--hardq20 CONNECT SERVER TO MONGODB Add connect in backend/app.js
- 50. TUTORIAL / FINDALL GETTHE NEXT STEP $gitreset--hardq21 USE MONGOOSE FOR FINDALL 1. Comment create & destroy route (and function) 2. Import mongoose with require 3. Replace article static model with a mongoose schema 4. Use mongoose to implement findAll
- 51. TUTORIAL / SEARCH GETTHE NEXT STEP $gitreset--hardq22 REPLACE FINDALL BY SEARCH Use a MongoDB filter to search on title. Bonus: filter on description and tags
- 52. TUTORIAL / ROUTE'CREATE' GET THE NEXT STEP $gitreset--hardq23 IMPLEMENT CREATE 1. Use mongoose to implement create 2. Uncomment the create route
- 53. TUTORIAL / ROUTE'DELETE' GET THE NEXT STEP $gitreset--hardq24 IMPLEMENT DELETE 1. Use mongoose to implement delete 2. Uncomment the delete route
- 54. © Fabien Vauchelles (2015) TUTORIAL / FINAL GETAND READ THE SOLUCE $gitreset--hardq25