同步：

var fs = require('fs');
var obj = JSON.parse(fs.readFileSync('file', 'utf8'));

异步：

var fs = require('fs');
var obj;
fs.readFile('file', 'utf8', function (err, data) {
  if (err) throw err;
  obj = JSON.parse(data);
});

如果您正在寻找异步加载JSON文件的完整解决方案，请使用错误处理从相对路径加载JSON文件

  // Global variables
  // Request path module for relative path
    const path = require('path')
  // Request File System Module
   var fs = require('fs');


// GET request for the /list_user page.
router.get('/listUsers', function (req, res) {
   console.log("Got a GET request for list of users");

     // Create a relative path URL
    let reqPath = path.join(__dirname, '../mock/users.json');

    //Read JSON from relative path of this file
    fs.readFile(reqPath , 'utf8', function (err, data) {
        //Handle Error
       if(!err) {
         //Handle Success
          console.log("Success"+data);
         // Parse Data to JSON OR
          var jsonObj = JSON.parse(data)
         //Send back as Response
          res.end( data );
        }else {
           //Handle Error
           res.end("Error: "+err )
        }
   });
})

目录结构：

使用节点fs extra（异步等待）

const readJsonFile = async () => {
    const myJsonObject = await fs.readJson('./my_json_file.json');
    console.log(myJsonObject);
}

readJsonFile() // prints your json object

同步：

var fs = require('fs');
var obj = JSON.parse(fs.readFileSync('file', 'utf8'));

异步：

var fs = require('fs');
var obj;
fs.readFile('file', 'utf8', function (err, data) {
  if (err) throw err;
  obj = JSON.parse(data);
});

https://nodejs.org/dist/latest-v6.x/docs/api/fs.html#fs_fs_readfile_file_options_callback

var fs = require('fs');  

fs.readFile('/etc/passwd', (err, data) => {
  if (err) throw err;
  console.log(data);
});  

// options
fs.readFile('/etc/passwd', 'utf8', callback);

https://nodejs.org/dist/latest-v6.x/docs/api/fs.html#fs_fs_readfilesync_file_options

您可以在文件系统文档中找到Node.js的所有用法！希望这对你有帮助！

function parseIt(){
    return new Promise(function(res){
        try{
            var fs = require('fs');
            const dirPath = 'K:\\merge-xml-junit\\xml-results\\master.json';
            fs.readFile(dirPath,'utf8',function(err,data){
                if(err) throw err;
                res(data);
        })}
        catch(err){
            res(err);
        }
    });
}

async function test(){
    jsonData = await parseIt();
    var parsedJSON = JSON.parse(jsonData);
    var testSuite = parsedJSON['testsuites']['testsuite'];
    console.log(testSuite);
}

test();