file reader to read json file code example

Example 1: read json file

const fs = require('fs')fs.readFile('./customer.json', 'utf8', (err, jsonString) => {    if (err) {        console.log("File read failed:", err)        return    }    console.log('File data:', jsonString) })

Example 2: read json data from file

// consider your file data is something like json string but aving parse issue 
//that means some additional char is there 
fs.readFile(ROLES_FILE, "utf8", (err, data) => {
      if (err) {
        res.status(403).json({});
      }
      const [localScope, action] = scope.split(".");
      const mapper = JSON.parse(data.toString("utf8").replace(/^\uFEFF/, ""));
      const isAllowed = checkRole(mapper, localScope, action, role);
      if (isAllowed) {
        next();
      } else {
        res.status(403).json({});
      }