To request the Garbage Collector in node.js to run with Node.js, we call the global.gc method.
For instance, we write
try {
global?.gc?.();
} catch (e) {
console.log("`node --expose-gc index.js`");
process.exit();
}
to call global.gc to request the garbage collector if it’s available.
We make the garbage collection available with the --expose-gc flag.
To listen to All Emitted Events in Node.js, we create our own Emitter class.
For instance, we write
class Emitter extends require("events") {
emit(type, ...args) {
console.log(type + " emitted");
super.emit(type, ...args);
}
}
to create the Emitter class that inherits from the events constructor.
And we add our own emit method to get the event type and call super.emit to emit the event.
To convert CSV to JSON in Node.js, we use the csvtojson module.
We install it by running
npm install --save csvtojson@latest
Then we use it by writing
const csv = require("csvtojson");
const jsonArrayObj = await csv().fromFile(csvFilePath);
console.log(jsonArrayObj);
to call fromFile to read the csv file into an JSON array.
Then we use await to get the JSON array of objects from the returned promise.
To get last modified file date in Node.js, we use the stats.mtime property.
For instance, we write
fs.stat("/dir/file.txt", (err, stats) => {
const mtime = stats.mtime;
console.log(mtime);
});
to call fs.stat to get the file metadata for the /dir/file.txt file.
And we use stats.mtime to get the last modified date.
To restart a Node.js server, we use the pkill command.
For instance, we run
pkill -HUP node
to kill all Node.js processes with pkill.
Then we start node again.