How do I set up a unique road handler?

[Kasa Peter]

I want to set it up as a post request, but it always gives me a 404 error.

Server js file:
const jsonServer = require("json-server");
const cors = require("cors");
const path = require("path");
const fs = require('fs');
const server1 = jsonServer.create();
const middlewares1 = jsonServer.defaults();

server1.use(cors());
server1.use(jsonServer.bodyParser);
server1.use(middlewares1);

server1.post('/archiv', (req, res) => { // I would like to send it to the archive path and then write the data to a file.
fs.writeFile('output.json', req.body, (err) => {
if (err) {
console.log(err);
res.status(500).send('error in write.');
} else {
res.status(200).send('writed file.');
}
});
})

const router1 = jsonServer.router(path.join(__dirname, "db1.json")); //The standard handler is then called correctly.
server1.use(router1);

server1.listen(3000, () => {
console.log("Server is running at http://localhost:3000");
})

Client js file:

function postServerData3000(route, sending) {

let fetchOp = {
    method: 'POST',
    cache: 'no-cache',
    mode: 'cors',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(sending)                                     // The shipment is already stringed here
};

return fetch(`http://localhost:3000/${route}`, fetchOp)         // The full url is specified and the archive string is substituted
    .then(response => response.json(), err => console.error(err));

}

[Saini Madhu]

@githubpeti85 Your setup seems almost correct, but there are a couple of adjustments needed to ensure your POST request works as intended. Here are the modifications:

Use JSON Server's bodyParser middleware properly: Instead of jsonServer.bodyParser, you should require json-server/lib/server and use its bodyParser function.

Check if the request is properly routed: Ensure that your client is sending data to the correct endpoint (/archiv).

Properly handle incoming JSON data in the server: When writing the data to a file, you need to convert it back from string to JSON format.

Here's the modified server.js file:
const jsonServer = require("json-server");
const cors = require("cors");
const path = require("path");
const fs = require('fs');

const server1 = jsonServer.create();
const middlewares1 = jsonServer.defaults();

server1.use(cors());
server1.use(jsonServer.bodyParser); // Importing bodyParser from json-server package
server1.use(middlewares1);

server1.post('/archiv', (req, res) => {
fs.writeFile('output.json', JSON.stringify(req.body), (err) => { // Convert req.body to JSON string
if (err) {
console.log(err);
res.status(500).send('error in write.');
} else {
res.status(200).send('writed file.');
}
});
});

const router1 = jsonServer.router(path.join(__dirname, "db1.json"));
server1.use(router1);

server1.listen(3000, () => {
console.log("Server is running at http://localhost:3000");
});

And the client.js file should remain the same.

With these modifications, your POST request should work properly. Make sure your client is sending the data to http://localhost:3000/archiv. Also, ensure that sending is a valid JSON object before stringifying it in your client code.