How to print request body in Koa

I have an app where I need to send data from React frontend to Koa server. Problem is that I have no idea how to print out request body in Koa.

In React I run this code on click

fetch("/metafield", {
      method: "POST",
      body: JSON.stringify({
        key: "key",
        value: "value",
        value_type: "string",
        namespace: "namespace",
      }),
    });

Just a simple fetch with body on Koa server endpoint.

In Koa I have this

router.post("/metafield", (ctx) => {
    console.log(ctx.request.body);
  });

For some reason this returns empty object {}.

I also tried with

const bodyParser = require("koa-bodyparser");
const server = new Koa();
server.use(bodyParser());

as suggested here, but the output is still the same. After that I tried adding bodyParser to koa-router like

const router = new Router();
router.use(bodyParser());

but still I get empty object in Koa app.

Thanks in advance

Okay. The solution is so simple.

It worked when I added

headers: {
        "Content-Type": "application/json",
      },

when sending request with fetch

Request should look like this now

fetch("/metafield", {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        key: "key",
        value: "value",
        value_type: "string",
        namespace: "namespace",
      }),
    });