我正在尝试在服务器上运行一个程序，将数据插入mongodb并进行检索。
当我尝试插入插入的数据但服务器出现故障时。
我的服务器代码是
server.js
var express = require("express"),
app = express(),
bodyParser = require('body-parser'),
errorHandler = require('errorhandler'),
methodOverride = require('method-override'),
hostname = process.env.HOSTNAME || 'localhost',
port = parseInt(process.env.PORT, 10) || 4004,
publicDir = process.argv[2] || __dirname + '/public';
var exec = require('child_process').exec;
var fs = require('fs');
var MongoClient = require('mongodb').MongoClient
, format = require('util').format;
//Show homepage
app.get("/", function (req, res) {
res.redirect("/index.html");
console.log("shubham ");
});
app.get("/index/", function (req, res) {
res.redirect("/index.html");
console.log("shubham ");
});
app.get("/search", function (req, res){
console.log("shubham batra");
var pro_name = req.query.name;
var pro_code = req.query.code;
var pro_category = req.query.category;
var pro_brand = req.query.brand;
MongoClient.connect('mongodb://127.0.0.1:27017/prisync', function(err, db) {
if (err) throw err;
console.log("Connected to Database");
var documen = {name:pro_name, code:pro_code , category:pro_category, brand:pro_brand };
//insert record
db.collection('urlinfo').insert(documen, function(err, records) {
if (err) throw err;
});
db.collection('urlinfo').find({} , function(err , products){ // LINE 48 ==========
if(err){
console.log(err);
res.json(err);
}else{
res.json(products); // LINE 53 ====================
}
});
});
});
//Search page
app.use(methodOverride());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(express.static(publicDir));
app.use(errorHandler({
dumpExceptions: true,
showStack: true
}));
console.log("Server showing %s listening at http://%s:%s", publicDir, hostname, port);
app.listen(port);
并提供以下错误：
/home/shubham/node_modules/mongodb/lib/utils.js:97 process.nextTick(function() { throw err; }); ^ TypeError: Converting circular structure to JSON at Object.stringify (native) at ServerResponse.json (/home/shubham/Music/pricesync/server/node_modules/express/lib/response.js:242:19) at /home/shubham/Music/pricesync/server/server.js:53:9 at handleCallback (/home/shubham/node_modules/mongodb/lib/utils.js:95:12) at Collection.find (/home/shubham/node_modules/mongodb/lib/collection.js:339:44) at /home/shubham/Music/pricesync/server/server.js:48:28 at /home/shubham/node_modules/mongodb/lib/mongo_client.js:439:11 at process._tickCallback (node.js:448:13)