Example of writing to a local file

script.js

var express = require('express');
var fs = require('fs');
var bodyParser = require('body-parser');

var app = express();
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json()); // Body parser use JSON data

app.post('/launches', function(req, res) {

    var outputFilename = './spaceReport.json'; // path of the file to output

    fs.writeFileSync(outputFilename, JSON.stringify(JSON.parse(req.body.payload), null, 4)); // write to the file system

    res.send('Saved to ' + outputFilename);

});

var port = 3000;
app.listen(port);
console.log('Express started on port %d ...', port);

If receiving this error: “PayloadTooLargeError: request entity too large”

maybe try:

app.use(bodyParser.json({limit: ’50mb’, extended: true}))
app.use(bodyParser.urlencoded({limit: ’50mb’, extended: true}))

Thank you!

That's fine it works. Thanks