React - Error: App(...): Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null

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I'm creating a full stack application using MERN and GraphQL Apollo. For connecting the backend to client, I'm using Apollo Client. Here is the code -

ApolloProvider.js

import React from "react";
import App from "./App";
import {
  ApolloClient,
  createHttpLink,
  InMemoryCache,
  ApolloProvider,
} from "@apollo/client";

const httpLink = createHttpLink({ uri: "http://localhost:5000" });

const client = new ApolloClient({
  link: httpLink,
  cache: new InMemoryCache(),
});

export default (
  <ApolloProvider client={client}>
    <App />
  </ApolloProvider>
);

index.js

import ReactDOM from "react-dom";
import reportWebVitals from "./reportWebVitals";
import ApolloProvider from "./ApolloProvider";

ReactDOM.render(ApolloProvider, document.getElementById("root"));

// If you want to start measuring performance in your app, pass a function
// to log results (for example: reportWebVitals(console.log))
// or send to an analytics endpoint.
reportWebVitals();

App.js

import React from "react";
import { BrowserRouter as Router, Route } from "react-router-dom";
import { Container } from "semantic-ui-react";

import "semantic-ui-css/semantic.min.css";
import "./App.css";

import MenuBar from "./components/MenuBar";
import Home from "./pages/Home";
import Login from "./pages/Login";
import Register from "./pages/Register";

function App() {
  <Router>
    <Container>
      <MenuBar />
      <Route exact path="/" component={Home} />
      <Route exact path="/login" component={Login} />
      <Route exact path="/register" component={Register} />
    </Container>
  </Router>;
}

export default App;

At ReactDOM.render(ApolloProvider, document.getElementById("root")); error is coming as - 'Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null.'

Can anyone please help on how to fix this? Edit: Stack trace - enter image description here

apollo-client react-apollo react-redux reactjs javascript
1 Answers

EDIT: looks like the problem was in your App.js all along. You don't return the JSX of your app. Add that in:

function App() {
  return (
     <Router>
        <Container>
        <MenuBar />
        <Route exact path="/" component={Home} />
        <Route exact path="/login" component={Login} />
        <Route exact path="/register" component={Register} />
        </Container>
     </Router>
  );
}

Original answer:

You need to actually render the element in ReactDOM.render, i.e.

ReactDOM.render(<ApolloProvider/>, document.getElementById("root"));

Also in your apollo provider, return a functional component, not pure JSX. Not sure if that'd matter, but might help, i.e.

const ApolloApp = () => (
  <ApolloProvider client={client}>
    <App />
  </ApolloProvider>
);

export default ApolloApp;
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