reactjs - When specified, "proxy" in package.json must be a string

Question

I would like to have proxy in my react client, my package.json contains:

...
"scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "proxy": {
    "/auth/google": {
      "target": "http://localhost:5000"
    }
   },
...

But when I ran it, I got error

When specified, "proxy" in package.json must be a string.
[1] Instead, the type of "proxy" was "object".
[1] Either remove "proxy" from package.json, or make it a string.

I tried to convert to string, no errors but proxy is not working

"proxy": "http://localhost:5000"

My App.js

<div className="App">
        <header className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <p>hey there</p>
          <a href="/auth/google">Sign In With Google</a>
        </header>
      </div>

Answer 1

The issue that you are facing is because of CRA v2.

Firstly, you will not require any additional configuration if you are just using a plain string in your proxy. But the moment you use an object, you are using advanced configuration.

So, you would have to follow the steps listed below:

1. Install http-proxy-middleware by typing npm i --save http-proxy-middleware

2. Remove the entries from package.json:

"proxy": {
    "/auth/google": {
        "target": "http://localhost:5000"
    }
}

3. Now create a setup file for your proxy. You should name it setupProxy.js in your src folder on the client side and type the following code:

const proxy = require('http-proxy-middleware');
module.exports = function(app) {
    app.use(proxy('/auth/google', 
        { target: 'http://localhost:5000/' }
    ));
}

for more info check this