Fetch API

 

 Fetch API in js: The fetch() method in JavaScript is used to request data from a server.

The request can be of any API that returns the data in JSON or XML.

This method required 

 1. one parameter

 2. The URL to request

 3. returns a promise.

 

 Syntex: 

    fetch("URL")

    .then(response =>{ 

   response.json()}).then((data)=>{

   console.log(data)

   });

url= ' https://api.github.com/user'

    fetch(url).then((response)=>{

        return response.json();

    }).then((data)=>{

        console.log(data)

    })

Parameters: This method requires one parameter and accepts two parameters:

• URL: The URL to which the request is to be made.
• Options: It is an array of properties. It is an optional parameter.

Return Value: It returns a promise whether it is resolved or not. 

##The return data can be of the format JSON or XML. 

###It can be an array of objects or simply a single object.

----NOTE: Without options, Fetch will always act as a get request.---

Making Post Request using Fetch: Post requests can be made using fetch 

Here write 

1. firstly write a function: function postData()

2. second write parameter- a. URL

                                           b. data 
                                           c. params{

                                             }-- method, header, body;

     function write-- fetch(url, params).then((response)=>{

                                return response.json();

                               }).then ((data)=>{

                               console.log(data)

                               });

function postData(){

    url= ' https://dummyjson.com/products/1'

    data= ''

    params= {

        method: 'post',

        header:

        {'content-Type': 'aplication/jeson'

    },

     body: data

    }

    fetch(url, params).then((response)=>{

        return response.json();

    }).then((data)=>{

        console.log(data)

    })

}