js read from json file code example

Example 1: read json file into object javascript

fs.readFile(filePath, function (error, content) {
    var data = JSON.parse(content);
    console.log(data.collection.length);
});

Example 2: read json from file js

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 3: 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({});
      }