Add example for excel to json with mapper from file and add docker support

examples/README.md

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 # Examples
 - Say Hello to Docker with Nodejs
+- Excel file transform to json with Nodejs

examples/excel2json/.gitignore

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+node_modules/
+yarn.lock
+package-lock.json
+yarn-error*
+outputs/

examples/excel2json/Dockerfile

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+FROM cubetiq/calpine-node:latest
+LABEL maintainer="sombochea@cubetiqs.com"
+
+ENV INPUT_FILE './data/people.xlsx'
+ENV OUTPUT_PATH './data/outputs'
+ENV MAPPER_FILE './data/mapper.json'
+
+WORKDIR /usr/src/app
+
+COPY . /usr/src/app
+
+RUN yarn
+
+CMD [ "node" , "index.js"]

examples/excel2json/Makefile

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+DOCKER_IMAGE=cubetiq/node-excel2json
+
+build:
+	@echo "Building docker image..."
+	docker build . -t ${DOCKER_IMAGE}
+
+run:
+	@echo "Running container..."
+	docker run --rm -t ${DOCKER_IMAGE}
+
+.PHONY: build

examples/excel2json/data/mapper.json

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+{
+  "data": [
+    {
+      "dataIndex": "Name",
+      "label": "Name"
+    },
+    {
+      "dataIndex": "Age",
+      "label": "Age"
+    }
+  ],
+  "configs": {}
+}

examples/excel2json/index.js

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+const XLSX = require("xlsx");
+const fs = require("fs");
+
+const NAME = process.env.APP_NAME || "excel2json";
+console.log("App Name =>", NAME);
+
+// load from env
+const INPUT_FILE = process.env.INPUT_FILE || "./data/people.xlsx";
+const OUTPUT_PATH = process.env.OUTPUT_PATH || "./data/outputs";
+const MAPPER_FILE = process.env.MAPPER_FILE || "./data/mapper.json";
+
+// get mapper in string
+const mapperString = fs.readFileSync(
+  MAPPER_FILE,
+  { encoding: "utf-8" },
+  (err) => {
+    if (err) throw err;
+    console.log("Load file suceed =>", MAPPER_FILE);
+  }
+);
+
+// convert mapper from string to json object
+const mapperJson = JSON.parse(mapperString);
+const columsData = mapperJson.data;
+
+// read workbook from excel file
+const wb = XLSX.readFile(INPUT_FILE);
+const xlData = XLSX.utils.sheet_to_json(wb.Sheets["Sheet1"]);
+
+// mapping the data from read excel file
+const data = xlData.map((row) => {
+  var _r = {};
+
+  columsData.map((col) => {
+    _r[col.label] = row[col.dataIndex];
+  });
+
+  return _r;
+});
+console.log("Data read from excel and mapped\n", data);
+
+// check directory and create it if not exist
+if (!fs.existsSync(OUTPUT_PATH)) {
+  fs.mkdirSync(OUTPUT_PATH);
+}
+
+// write to file
+fs.writeFile(`${OUTPUT_PATH}/people_${new Date().getTime()}.json`, JSON.stringify(data), (err) => {
+  if (err) throw err;
+  console.log("Write succeed!");
+});

examples/excel2json/package.json

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+{
+  "name": "excel2json",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Sambo Chea <sombochea@cubetiqs.com>",
+  "license": "MIT",
+  "dependencies": {
+    "xlsx": "^0.16.9"
+  }
+}