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DAY 6 - JULY 27

HASH FUNCTION

Hash Function helps to find where the data is located. Somewhat related to data structure

APPLICATION PROGRAMMING INTERFACE (API)

API – Third Party Function –helps to do some activity –get the required data for our Program.

In programming languages it allow developers to interact with other systems / application to get data

(E.g)

OLA/UBER uses Google Map API

Some signup websites uses Gmail and Facebook API


SOAP API VS REST API

Older Version --Simple Object Access Protocol  - Introduced by MicroSoft - XML

Current Version --REpresentational State Transfer – Supported by Google – json/xml

REST API – Simple and  Look like a Web URL

FUTURE API  --  PROTOBUF


 HOW CAN WE USE API IN OUR PROGRAM TO GET DATA

XML VERSION

var request = new XMLHttpRequest()
request.open('GET', 'https://restcountries.eu/rest/v2/all', true)
request.send()
request.onload = function () {

    var data = JSON.parse(this.response)
    console.log(data)
}

JSON VERSION

var url = 'https://restcountries.eu/rest/v2/all'
fetch(url)
    .then(res => res.json())
    .then(data => console.log(data))


OPEN API   

Easy to Access

Just enter URL & Get the data

https://restcountries.eu/rest/v2/all


CORS API - Cross Orgin Resource Sharing

Works perfectly in Back end. (Whenever we are running the code in the server it gives the data) but in Front end it gives Error (Whenever we run directly in the browser it shows error)

To run this kind of API in browser console we need additional proxy server

API

https://api.domainsdb.info/v1/domains/search?domain=facebook&zone=com

PROXY

https://cors-anywhere.herokuapp.com/

url = PROXY+API

https://cors-anywhere.herokuapp.com/https://api.domainsdb.info/v1/domains/search?domain=facebook&zone=com

AUTH API

To get this kind of API / API data we need some authorization and authentication from the third party

API

http://api.openweathermap.org/data/2.5/weather?q=New%20Delhi&appid=4d28367ef9a7022ee96d046c2a1f2b5f

To get the above API we need to get Auth from the below third party website

www.openweathermap.org


0 AUTH API - @ Backend Developer Course


MENTORS

How to get data through API in node js

Explanation for codes/keywords







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