Post Request stuck on Postman - node.js

Question

I am learning to build API using Node.js, Express and MongoDB. I am on early learning phase.
My code are as follow.
const app = express();
const mongojs = require("mongojs");
const { body, param, validationResult } = require("express-validator");
const db = mongojs("travel", ["records"]);
const bodyParser = require("body-parser");
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.get("/api/records", function (req, res) {
const options = req.query;
const sort = options.sort || {};
const filter = options.filter || {};
const limit = 2;
const page = parseInt(options.page) || 1;
const skip = (page - 1) * limit;
for (var i in sort) {
sort[i] = parseInt(sort[i]);
}
db.records
.find(filter)
.sort(sort)
.skip(skip)
.limit(limit, function (err, data) {
if (err) {
return res.sendStatus(500);
} else {
return res.status(200).json({
meta: {
filter,
sort,
skip,
limit,
page,
total: data.length,
},
data,
links: {
self: req.originalUrl,
},
});
}
});
});
app.post("/api/records", function (req, res) {
db.records.insert(req.body, function (err, data) {
if (err) {
return res.status(500);
}
const _id = data._id;
res.append("Location", "/api/records/" + _id);
return res.send(201).json({
meta: { _id },
data,
});
});
});
app.listen(8000, function () {
console.log("Server running at port 8000...");
});
When I try GET request on Postman, it works fine. But when I try POST request, it shows like the following. error msg image link.
Please let me know what is wrong here.
Thanks in advance