Convert a YAML file to JSON using Nodejs

yaml2json.js

"use strict";

// npm install yamljs

const YAML = require("yamljs");

const fs = require("fs");

const readline = require("readline");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

if (process.argv.length < 3) {
    console.log("Missing file operand");

    process.exit(1);
}

let queue = [];

let next = (() => {
    let counter = 0;

    return () => {
        if (counter >= queue.length) {
            return;
        }

        let actual = counter++;

        queue[actual]();

        queue[actual] = null;
    }
})();

for (let x = 2; x < process.argv.length; x++) {
    queue.push(() => {
        try {
            let inputFile = process.argv[x];

            let yaml = fs.readFileSync(inputFile).toString();

            let outputFile = inputFile.replace(/(\.yaml|)$/, ".json");

            let parseYaml2JsonAndSave = () => {
                let data;

                try {
                    data = YAML.parse(yaml);
                } catch (error) {
                    console.log(error);

                    process.exit(2);
                    // next();
                }

                let json = JSON.stringify(data, null, "    ");

                try {
                    fs.writeFileSync(outputFile, json);
                } catch (error) {
                    console.log(error);

                    process.exit(3);
                    // next();
                }

                console.log(inputFile + " >>> " + outputFile);

                next();
            };
            
            try {
                fs.accessSync(outputFile);

                rl.question(
                    "File '" + outputFile + "' already exists. Do you wanna overwrite? [y/N] ",
                    (input) => {
                        rl.pause();

                        switch (input.toString().toLowerCase().trim()) {
                            case "y":
                            case "yep":
                            case "yes":
                                parseYaml2JsonAndSave();

                                break;

                            default:
                                next();
                        }
                    }
                );
            } catch (error) {
                parseYaml2JsonAndSave();
            }
        } catch (error) {
            console.log(error);

            next();
        }
    });
}

next();