First commit.

Author: lfabl

.gitignore

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+/node_modules
+/.history
+*.lock
+error_log
+/test/*

.npmignore

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+/node_modules
+/.history
+*.lock
+error_log
+/test/*

README.md

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+### Error Printer for NodeJS
+This project provides a simple function for nodejs where you can automatically write the error message, error code, error date and formatted error date to a file.
+
+###### How to test:
+```
+yarn test
+```
+
+###### How to run:
+```
+yarn start
+```
+
+###### How to use in the project:
+```
+(in ES6)
+import error_log from "error-printer";
+
+try {
+  // ... any codes
+} catch(err) {
+  error_log({
+    message: err.message
+  });
+}
+```

index.js

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+const fs = require("fs");
+const moment = require("moment");
+
+let MAIN_DIRECTORY = __dirname.replace(/\\/g, '/').replace("/node_modules/error-printer", "");
+let OPTIONS = {
+  logFileName: "error_log",
+  messageTitle: "Error message",
+  codeTitle: "Error code",
+  datePureTitle: "Error Date ( Pure )",
+  dateFormattedTitle: "Error Date ( Formatted )",
+  formattedDateConfig: "DD MMMM YYYY hh:mm A",
+  isWriteCode: true,
+  isWritePureDate: true,
+  isWriteFormattedDate: true
+};
+
+const setMainDirectory = (directory) => {
+  MAIN_DIRECTORY = directory;
+}
+
+const setOptions = (options) => {
+  OPTIONS = {
+    ...OPTIONS,
+    ...options
+  }
+};
+
+const error_log = ({
+  options,
+  message,
+  code
+}) => {
+  const _options = {
+    ...OPTIONS,
+    ...options
+  };
+
+  // Error file exists control:
+  const fileExists = fs.existsSync(MAIN_DIRECTORY + `/${_options.logFileName}`);
+
+  // If error file do not exists, it will be create:
+  if (!fileExists) {
+    fs.writeFileSync(MAIN_DIRECTORY + `/${_options.logFileName}`, "");
+  }
+
+  // Error message:
+  let errorData = `
+${_options.messageTitle}: ${message}
+`;
+
+  if (_options.isWriteCode) {
+    errorData += `${_options.codeTitle}: ${code}`;
+  }
+
+  if (_options.isWritePureDate) {
+    errorData += `${_options.datePureTitle}: ${new Date().toISOString()}\n`;
+  }
+
+  if (_options.isWriteFormattedDate) {
+    errorData += `${_options.dateFormattedTitle}: ${moment(new Date()).format(_options.formattedDateConfig)}\n`;
+  }
+
+  errorData += `\n`;
+
+  // Write new error message to error_log file.
+  fs.appendFile(MAIN_DIRECTORY + `/${_options.logFileName}`, errorData, err => {
+    if (err) {
+      console.error(err);
+      return err;
+    }
+  });
+};
+
+module.exports = error_log;
+module.exports.setMainDirectory = setMainDirectory;
+module.exports.setOptions = setOptions;

package.json

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+{
+  "name": "error-printer",
+  "version": "1.0.0-pre-alpha.1",
+  "description": "This project was developed for Node JS APIs need to error handling on production.",
+  "main": "index.js",
+  "scripts": {
+    "start": "node .",
+    "test": "node test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/lfabl/error-printer.git"
+  },
+  "keywords": [
+    "error",
+    "handler",
+    "logger"
+  ],
+  "author": "lfabl",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/lfabl/error-printer/issues"
+  },
+  "homepage": "https://github.com/lfabl/error-printer#readme",
+  "dependencies": {
+    "moment": "^2.29.3"
+  }
+}

test.js

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+const error_log = require(".");
+const {
+  setMainDirectory
+} = require(".");
+
+setMainDirectory(__dirname + "/test");
+
+error_log({
+  options: {
+    logFileName: "test"
+  },
+  message: "halo",
+  code: 400
+});