Use Node.js to create a REST API
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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.
![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-gate01/85/Use-Node-js-to-create-a-REST-API-27-320.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-gate01/85/Use-Node-js-to-create-a-REST-API-28-320.jpg)
Use Node.js to create a REST API
- 1. NODE.JS
- 2. INTRODUCTION
- 3. WHAT IS NODE.JS ? Node.JS is the Javascript engine of Chrome, port to be used from the command line.
- 5. BASICS
- 8. HELLO WORLD IN NODE.JS hello.js console.log('HelloWorld!'); $nodehello.js >HelloWorld!
- 9. DON'T FORGET THE DEMO.DON'T FORGET THE DEMO.
- 12. YOU PREPARE A DEMO,YOU PREPARE A DEMO, DON'T U ?DON'T U ?
- 15. WHAT IS IT ? "Fast, unopinionated, minimalist web framework for Node.js" (expressjs.com)
- 16. HELLO WORLD IN EXPRESS varexpress=require('express'); varapp=express(); app.get('/',function(req,res){ res.send('HelloWorld!'); }); app.listen(9001); Don’t forget: $npminstallexpress
- 17. LIVE DEMO ?LIVE DEMO ?
- 18. MIDDLEWARE / WHAT ? Middlewares can : make changes to the request and the response objects end the request
- 20. MIDDLEWARE / STANDARD MODULES 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 / HELLO WORLD 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 DEMO PILL !CHOOSE THE DEMO PILL !
- 23. ROUTER / WHY ? Routers help to split the code in modules
- 24. MONGOOSE
- 25. WHAT IS IT ? Mongoose is a Node.js connector for MongoDB.
- 26. CONNECT TO MONGODB varmongoose=require('mongoose'); mongoose.connect('mongodb://localhost/test');
- 28. 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'); });
- 31. MEAN STACK
- 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 PROMISED USHE HAS PROMISED US AN EXAMPLE, RIGHT?AN EXAMPLE, RIGHT?
- 36. ROUTE EXAMPLE 1. Define routes 2. Define model 3. Define processing
- 37. DID HE FORGETDID HE FORGET THE EXAMPLE ?THE EXAMPLE ?
- 38. TEST YOUR API !
- 41. TUTORIAL
- 42. TUTORIAL / GET THE PROJECT GET THE PROJECT $gitclonehttps://github.com/fabienvauchelles/stweb-angularjs-tutorial.git $cdstweb-angularjs-tutorial/backend
- 43. TUTORIAL / SERVER GET THE NEXT STEP $gitreset--hardq15 $npminstall CREATE A SERVER Fill backend/app.js
- 44. TUTORIAL / FIRST ROUTE 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 / IMPORT DATA START MONGODB In a new shell : $mongod
- 48. TUTORIAL / MONGOOSE GET THE NEXT STEP $gitreset--hardq19 IMPORT DATA $mongoimport--dbpostagram--collectionarticles --filearticles-init.json ADD MONGOOSE TO THE PROJECT $npminstallmongoose--save
- 49. TUTORIAL / CONNECT GET THE NEXT STEP $gitreset--hardq20 CONNECT SERVER TO MONGODB Add connect in backend/app.js
- 50. TUTORIAL / FINDALL GET THE 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 GET THE 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 GET AND READ THE SOLUCE $gitreset--hardq25