How to allow CORS in react js

Question

I m using Reactjs and using API through AJAX in javascript  How can we resolve this issue  Previously I used CORS tools  but now I need to enable CORS

User · Answer

It is better to add CORS enabling code on Server Side  To enable CORS in NodeJS and ExpressJs based application following code should be included-  var app   express     app use function req  res  next      res header  Access-Control-Allow-Origin           res header  Access-Control-Allow-Headers    Origin  X-Requested-With  Content-Type  Accept      next

User · Answer

I deal with this issue for some hours  Let s consider the request is Reactjs  javascript  and backend  API  is Asp  Net Core   in the request  you must set in header Content-Type    Axios               method   post               headers     Content-Type    application json                url   https   localhost 44346 Order Order GiveOrder               data  order               then function  response                console log response                   and in backend  Asp  net core API  u must have some setting   1  in Startup --  ConfigureServices    region Allow-Orgin             services AddCors c   gt                                c AddPolicy  AllowOrigin   options   gt  options AllowAnyOrigin                                  endregion   2  in Startup --  Configure before app UseMvc       app UseCors builder   gt  builder                  AllowAnyOrigin                    AllowAnyMethod                    AllowAnyHeader                    AllowCredentials       3  in controller before action    EnableCors  AllowOrigin

User · Answer

You just have to add cors to your backend server js file in order to do cross-origin API Calls  const cors   require  cors    app use cors

User · Answer

Suppose you want to hit https   yourwebsitedomain app getNames from http   localhost 3000 then just make the following changes   packagae json        name    version-compare-app       proxy    https   yourwebsitedomain                dependencies           testing-library jest-dom     4 2 4         testing-library react     9 5 0              In your component use it as follows   import axios from  axios    componentDidMount     const getNameUrl      app getNames    axios get getChallenge  then data   gt      console log data            Stop your local server and re run npm start  You should be able to see the data in browser s console logged

User · Answer

Possible repeated question from How to overcome the CORS issue in ReactJS  CORS works by adding new HTTP headers that allow servers to describe the set of origins that are permitted to read that information using a web browser  This must be configured in the server to allow cross domain   You can temporary solve this issue by a chrome plugin called CORS

User · Answer

on the server side in node js I just added this and it worked  reactjs front end on my local machine can access api backend hosted on azure     Enables CORS const cors   require  cors    app use cors   origin  true

User · Answer

there are 6 ways to do this in React   number 1 and 2 and 3 are the best   1-config CORS in the Server-Side 2-set headers manually like this  resonse object header  quot Access-Control-Allow-Origin quot    quot   quot    resonse object header  quot Access-Control-Allow-Headers quot    quot Origin  X-Requested-With  Content-Type  Accept quot     3-config NGINX for proxy pass which is explained here  4-bypass the Cross-Origin-Policy with chrom extension only for development and not recommended    5-bypass the cross-origin-policy with URL bellow only for development   quot https   cors-anywhere herokuapp com  type your url here  quot   6-use proxy in your package json file  only for development  if this is your API  http   45 456 200 5 7000 api profile  add this part in your package json file   quot proxy quot    quot http   45 456 200 5 7000  quot   and then make your request with the next parts of the api  React useEffect      gt        axios          get  api profile             then function  response                console log response                       catch function  error                console log error

User · Answer

Use this  app use  req res  next   gt       res setHeader  Access-Control-Allow-Origin   quot http   localhost 3000 quot        res setHeader  Access-Control-Allow-Headers   quot   quot        res header  Access-Control-Allow-Credentials   true       next

[javascript] How to allow CORS in react.js?

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