index.js

const express = require("express");
const app = express();
const bodyP = require("body-parser");
const cors = require("cors");
const compiler = require("compilex");
const options = { stats: true };
compiler.init(options);

app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(cors());

app.get("/", function (req, res) {
  
  res.send("Hello World!!");
});

app.post("/compile", function (req, res) {
  var code = req.body.code;
  var input = req.body.input;
  var lang = req.body.lang;
  console.log(code + " " + input + " " + lang);

  try {
    if (lang == "Cpp") {
      if (!input) {
        var envData = {
          OS: "linux",
          cmd: "g++",
          options: { timeout: 10000 },
        };
        compiler.compileCPP(envData, code, function (data) {
          if (data.output) {
            res.send(data);
          } else {
            res.send({ error: data.error });
          }
        });
      } else {
        var envData = {
          OS: "linux",
          cmd: "g++",
          options: { timeout: 10000 },
        };
        compiler.compileCPPWithInput(envData, code, input, function (data) {
          if (data.output) {
            res.send(data);
          } else {
            res.send({ error: data.error });
          }
        });
      }
    } else if (lang == "Java") {
    if (!input) {
        var envData = { OS: "linux" };
        compiler.compileJava(envData, code, function (data) {
            if (data.output) {
                res.send(data);
            } else {
                res.send({ error: data.error });
            }
        });
    } else {
        var envData = { OS: "linux" };

        compiler.compileJavaWithInput(envData, code, input, function (data) {
            if (data.output) {
                res.send(data);
            } else {
                res.send({ error: data.error });
            }
        });
    }
}else if (lang == "Python") {
      if (!input) {
        var envData = { OS: "linux" };
        compiler.compilePython(envData, code, function (data) {
          if (data.output) {
            res.send(data);
          } else {
            res.send({ error: data.error });
          }
        });
      } else {
        var envData = { OS: "linux" };
        compiler.compilePythonWithInput(envData, code, input, function (data) {
          if (data.output) {
            res.send(data);
          } else {
            res.send({ error: data.error });
          }
        });
      }
    }
  } catch (e) {
    console.log("error:" + e);
  }
});
const port = 7860
app.listen(port, () => { console.log(`Open http://localhost:${port}`) })