make a http request with a custom body as json and return a json response in javascript

You can use the fetch API to make HTTP requests in JavaScript. Here is an example of how to make a POST request with a JSON body and receive a JSON response:

index.tsx
async function makeRequest(url, data) {
  const response = await fetch(url, {
    method: 'POST',
    body: JSON.stringify(data),
    headers: {
      'Content-Type': 'application/json'
    }
  });
  const jsonResponse = await response.json();
  return jsonResponse;
}

// Example usage
const data = { name: 'John Doe', email: 'johndoe@example.com' };
const result = await makeRequest('https://example.com/api/user', data);
console.log(result);
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In this example, we define an async function called makeRequest which takes a URL and a JavaScript object containing data to send as the JSON body.

We then use the fetch API to make a POST request with the specified headers and JSON body. The response is then parsed as JSON using the json() method, which returns a Promise that resolves to the parsed JSON object.

Finally, we return the parsed JSON response to the caller.