blocks|key|3880019|text|尝试通过将--dbpath与mongod一起提供来启动mongoDB服务器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3880020|sudo+mongod+--dbpath+/var/lib/mongo/data/db+&|code-block|syntax|javascript|3880021|最后的'&‘将启动mongodb服务器作为你的服务器上的服务。|3880022|希望它能起作用。|3880023|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Try to start mongoDB server by giving the --dbpath with mongod.

<pre><code>sudo mongod --dbpath /var/lib/mongo/data/db &amp;
</code></pre>

'&amp;' in the last will start the mongodb server as service on your server. 

Hope it Works.

blocks|key|1507259|text|对于windows+-只需转到Mongodb文件夹(例如:+C:\ProgramFiles\MongoDB\Server\3.4\bin)并打开文件夹中的cmd，然后键入"mongod.exe+--dbpath+c:\data\db“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507260|如果c:\data\db文件夹不存在，那么自己创建它，然后再次运行上面的命令。|1507261|现在一切都应该正常工作了。)|1507262|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

For windows - just go to Mongodb folder
 (ex : C:\ProgramFiles\MongoDB\Server\3.4\bin) and open cmd in the folder and type
"mongod.exe --dbpath c:\data\db"

if c:\data\db folder doesn't exist then create it by yourself and run above command again.

All should work fine by now.))

blocks|key|3880104|text|我在Windows上也遇到了同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3880105|Ctrl%2BC关闭mongod，然后重新启动mongod。|offset|length|style|BOLD|3880106|我不确定，但它似乎是最初的门神工作的开放和关闭连接。然后，它无法关闭一些较早的连接，并达到打开的连接的限制。重启后，它又能正常工作了。|3880107|entityMap^0|0|0|S|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I had the same issue on Windows.

Ctrl+C to close mongod, and start mongod again.

Am not sure, but it seems that initially mongod was working opening and closing connections. Then, it was not able to close some earlier connections and reached limit for opened ones. After restarting mongod, it works again.

blocks|key|3880125|text|很可能您的mongo+db服务没有启动。对于ubuntu+:+windows的sudo+service+mongod+start：转到服务并启动MongoDB服务|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3880126|还要安装mondoDB服务https://www.mongodb.com/download-center/community的链接|3880127|我遇到了这个问题，多亏了这个人的回答，我解决了它https://stackoverflow.com/a/47433551/7917608|3880128|entityMap|0|LINK|mutability|MUTABLE|url|https://www.mongodb.com/download-center/community|1|https://stackoverflow.com/a/47433551/7917608^0|13|P|0|D|1D|0|0|O|18|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|H|3|I|5|6|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|J|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]|R|$5|M|N|O|E|$P|S]]]]

most probably your mongo db service is not started. 
For ubuntu : <code>sudo service mongod start</code>
For windows : go to services and start the MongoDB service

also install link for mondoDB service <a href="https://www.mongodb.com/download-center/community" rel="nofollow noreferrer">https://www.mongodb.com/download-center/community</a>

I had this problem and i solved it thanks to this man's answer <a href="https://stackoverflow.com/a/47433551/7917608">https://stackoverflow.com/a/47433551/7917608</a>

blocks|key|3880162|text|这可能是因为MongoDB服务未启动。请按照以下步骤启动它：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3880163|服务转到控制面板，然后单击管理服务，然后单击|3880164|。将打开一个新窗口。|ordered-list-item|3880165|Search+MongoDB.exe.右键单击它，然后选择Start。|3880166|3880167|服务器将启动。现在再次执行npm+start，代码这次可能会正常工作。|CODE|3880168|entityMap^0|6|7|0|D|9|0|0|A|0|0|Z|0|0|0|Z|D|9|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|K|3|L|5|J|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|P]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|R|$]]

This happened probably because the MongoDB service isn't started. Follow the below steps to start it:

<ol>
<li>Go to Control Panel and click on Administrative Tools.</li>
<li>Double click on Services. A new window opens up.</li>
<li>Search MongoDB.exe. Right click on it and select Start. </li>
</ol>

The server will start. Now execute <code>npm start</code> again and the code might work this time.

blocks|key|5297270|text|在运行节点服务器的同时，您可能需要继续运行DB进程(通过运行mongod)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5297271|entityMap^0|U|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

You probably need to continue running your DB process (by running <code>mongod</code>) while running your node server.

blocks|key|5297301|text|我有以下错误：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5297302|Error:+connect+ECONNREFUSED+127.0.0.1:27017|code-block|syntax|javascript|5297303|在我的例子中，出现这个问题是因为根本没有安装MongoDB。|5297304|解决方案是从下面的位置安装MongoDB：|5297305|https://www.mongodb.com/download-center/community|offset|length|5297306|安装ECONNREFUSED后，未再次出现错误。|style|CODE|5297307|希望这能有所帮助。|5297308|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|1D|0|0|2|C|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|13|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|14|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|15|8|@]|9|@$M|16|N|17|1|18]]|A|$]]|$1|O|3|P|5|6|7|19|8|@$M|1A|N|1B|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1C|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|L]]]]

I had below error:

<pre><code>Error: connect ECONNREFUSED 127.0.0.1:27017
</code></pre>

In my case, this issue occurred since MongoDB is not installed at all.

The solution was to install MongoDB from below location: 
 <a href="https://www.mongodb.com/download-center/community" rel="noreferrer">https://www.mongodb.com/download-center/community</a> 

After installing the <code>ECONNREFUSED</code> error did not appear again.

Hope that helps.

blocks|key|1769569|text|我完全忘记启动MongoDB了。转到终端中的单独选项卡，然后键入：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1769570|sudo+service+mongod+start|code-block|syntax|javascript|1769571|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I've forgot to start MongoDB at all.
Go to separate tab in terminal and type:

<pre><code>sudo service mongod start
</code></pre>

blocks|key|1502981|text|如果你已经安装了"+MongoDB+"，如果你不小心退出了MongoDB服务器，那么“重新启动你的系统”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1502982|这个方法解决了我..。|1502983|仅在Windows上|1502984|还有另一种方法：|1502985|按：|1502986|Windows+%2B+R|code-block|syntax|javascript|1502987|类型：|1502988|services.msc|1502989|并点击“确定”，打开“服务”窗口，然后在列表中搜索"MongoDB服务器“。找到"MongoDB服务器“后，右击并从弹出菜单中选择”启动“。|1502990|MongoDb服务器将开始运行。|1502991|希望它能工作！！|1502992|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

If you already installed &quot;MongoDB&quot;, if you accidentally exit from the MongoDB server, then &quot;restart your system&quot;.
This method solved me...
[On Windows only]
And also another method is there:
press:
<pre><code>Windows + R
</code></pre>
type:
<pre><code>services.msc
</code></pre>
and click &quot;ok&quot;, it opens
&quot;services&quot; window, and then search for &quot;MongoDB Server&quot; in the list.
After you find &quot;MongoDB Server&quot;, right-click and choose &quot;start&quot; from the pop-up menu.
The MongoDb Server will start running.
Hope it works!!

blocks|key|1769670|text|请确保您的mongo+DB设置为自动，并在控制面板/管理工具/服务中运行，如下所示。这样你就不必每次都手动启动mongod.exe了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1769671|​|1769672|📷|atomic|offset|length|1769673|1769674|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/0862013698d030ff0a1c5b7ddb207d7c.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Please ensure that your mongo DB is set Automatic and running at Control Panel/Administrative Tools/Services like below. That way you wont have to start mongod.exe manually each time.

<a href="https://i.stack.imgur.com/SHkfB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SHkfB.png" alt="enter image description here"></a>

blocks|key|1507392|text|对于Ubuntu用户，请运行sudo+systemctl+restart+mongod|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1507393|entityMap^0|E|T|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

For Ubuntu users run
<code>sudo systemctl restart mongod</code>

blocks|key|1503039|text|我遇到了同样的错误，因为我没有安装mongoDB。确保你已经安装了mongodb，如果还没有，你可以从这里的https://www.mongodb.com/download-center/community下载它|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1503040|entityMap|0|LINK|mutability|MUTABLE|url|https://www.mongodb.com/download-center/community^0|1I|1D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I had the same error because i had not installed mongoDB.
Make sure that you have mongodb installed and if not, you can download it from here <a href="https://www.mongodb.com/download-center/community" rel="noreferrer">https://www.mongodb.com/download-center/community</a>

blocks|key|1769740|text|如果您是windows用户，请右键单击Start并打开Windows+Powershell(以管理员身份运行)。然后键入|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1769741|mongod|code-block|syntax|javascript|1769742|就这样。你的数据库一定会连接上的！|1769743|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you are a windows user, right click on Start and open Windows Powershell(Run as administartor). Then type

<pre><code>mongod
</code></pre>

That's it.
Your database will surely get connected!

blocks|key|1769745|text|解决方案是从下面的位置安装MongoDB：https://www.mongodb.com/download-center/community|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1769746|entityMap|0|LINK|mutability|MUTABLE|url|https://www.mongodb.com/download-center/community^0|L|1D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The solution was to install MongoDB from below location:
<a href="https://www.mongodb.com/download-center/community" rel="nofollow noreferrer">https://www.mongodb.com/download-center/community</a>

blocks|key|5297601|text|因为在您尝试启动mongo+shell之前，您没有启动mongod进程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5297602|启动mongod服务器|5297603|mongod|code-block|syntax|javascript|5297604|打开另一个终端窗口|5297605|启动mongo+shell|5297606|mongo|5297607|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|V|8|@]|9|@]|A|$G|H]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

because you didn't start mongod process before you try starting mongo shell.
Start mongod server
<pre><code>mongod
</code></pre>
Open another terminal window
Start mongo shell
<pre><code>mongo
</code></pre>

blocks|key|3880488|text|按CTRL%2BALT%2BDELETE/task+manager，然后转到服务，找到MongoDB，右击它。开始吧。回到终端。npm启动它会起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3880489|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Press CTRL+ALT+DELETE/task manager , then go to services , find MongoDB , right click on it. start. go back to terminal . npm start it will work.

blocks|key|1769824|text|我在windows10上也遇到了同样的问题，我只是卸载了MongoDB，然后重新安装，它就开始工作了。它解决了我的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1769825|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I was facing the same issue on windows 10. I just uninstall MongoDB and installed it again and it started working. It solved my problem.

blocks|key|3880532|text|在我的特定实例中，我连接到VPN，这以某种方式阻塞了到MongoDB的本地主机连接。当我断开我的虚拟专用网时，它起作用了。这是一个特例，但很高兴知道这一点。因此，任何阻碍您的网络连接的问题，都要得到解决。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3880533|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my particular instance, I was connected to a VPN and that was blocking the localhost connection to MongoDB somehow. It worked when I disconnected my VPN. It's a special case, but good to know nonetheless. So anything impeding your network connectivity, Get that fixed.

blocks|key|1769877|text|我今天也遇到了同样的问题..一直在寻找答案..我在Ubuntu上..。但是，我找不到在此线程上工作的正确版本。经过大量的研究，下面的方法终于对我起作用了！！:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1769878|首先，在运行之后|1769879|mongod+dbpath|code-block|syntax|javascript|1769880|如果mongodb正在查找data/db目录。这是我安装的mongodb应用程序中缺少的。因此，我运行了以下命令：|1769881|$+sudo+mkdir+-p+/data/db|1769882|然后跑，|1769883|$+sudo+chown+-R+$USER+/data/db|1769884|chown+-更改文件/目录的所有权。即。文件/目录的所有者更改为指定的目录，但不修改权限。如下所示：https://unix.stackexchange.com/questions/402062/how-are-chown-and-chmod-command-different-in-the-given-operation|offset|length|1769885|最后，运行|1769886|`$+sudo+systemctl+enable+mongod.service|1769887|它将显示一条消息:+Created+symlink+/etc/systemd/system/multi-user.target.wants/mongod.service→/lib/systemd/system/mongod.service并启动服务。|1769888|entityMap|0|LINK|mutability|MUTABLE|url|https://unix.stackexchange.com/questions/402062/how-are-chown-and-chmod-command-different-in-the-given-operation^0|0|0|0|0|0|0|0|1F|34|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|1C|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|1D|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|1E|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@$S|1G|T|1H|1|1I]]|A|$]]|$1|U|3|V|5|6|7|1J|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|1K|8|@]|9|@]|A|$G|H]]|$1|Y|3|Z|5|6|7|1L|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|17]]]]

I was having the same problem today.. and has been searching for answers.. I am on Ubuntu... however, I could not find the correct one that works on this thread.. after much research the following worked for me finally!! :)
First, after running
<pre><code>mongod dbpath
</code></pre>
if appeared that mongodb was looking for the data/db directory.. which was missing in my installed mongodb app.. so I ran the following commands:
<pre><code>$ sudo mkdir -p /data/db
</code></pre>
then run,
<pre><code>$ sudo chown -R $USER /data/db
</code></pre>
chown - changes ownership of files/dirs. Ie. owner of the file/dir changes to the specified one, but it doesn't modify permissions. As detailed here: <a href="https://unix.stackexchange.com/questions/402062/how-are-chown-and-chmod-command-different-in-the-given-operation">https://unix.stackexchange.com/questions/402062/how-are-chown-and-chmod-command-different-in-the-given-operation</a>
Finally, run
<pre><code>`$ sudo systemctl enable mongod.service
</code></pre>
It will give a message: Created symlink /etc/systemd/system/multi-user.target.wants/mongod.service → /lib/systemd/system/mongod.service and started the service.

blocks|key|1503144|text|适用于Windows用户的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1503145|这是因为MondgDB服务器已停止。要解决此问题，您可以：|1503146|1503147|1搜索服务，使用左下角搜索选项进行该搜索。|ordered-list-item|1503148|1503149|2然后有一个齿轮图标，名为“服务”。|1503150|3点击后，你会看到一个窗口，里面有很多服务|1503151|4向下滚动，你会发现'MongoDB服务器(MongoDB)‘。|1503152|5，因此您将看到有一个启动服务的选项。|1503153|6启动它。|1503154|1503155|1，然后打开命令提示符。|1503156|1503157|2类mongod|offset|length|style|CODE|1503158|现在，您可以连接到服务器了。|1503159|如果您的sql+server服务关闭，则此步骤也可以正常工作。(查找sql+server服务)|1503160|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|2|6|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|1B|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|1D|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1E|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1F|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1G|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1H|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|T|3|U|5|G|7|1J|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1L|8|@$Y|1M|Z|1N|10|11]]|9|@]|A|$]]|$1|12|3|13|5|6|7|1O|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|1P|8|@]|9|@]|A|$]]|$1|16|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]]|17|$]]

For Windows users.
This happens because the MondgDB server is stopped.
to fix this you can,
<ol>
<li>1 search for Services ,for that search using the left bottom corner
search option.
2 then there is a gear icon named with 'Services'.
3 after clicking that you will get a window with lot of services
4 scroll down and you will find 'MongoDB server (MongoDB)'.
5 so you will see that there is an option to start the service.
6 start it.
</li>
<li>1 then open your command prompt.
2 type <code>mongod</code>
</li>
</ol>
now you can connect to your server.
this steps also working fine if your sql server service down. (find sql server services)

blocks|key|5297763|text|只需从终端启动mongo服务器|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5297764|Ubuntu+-|5297765|+++++sudo+systemctl+start+mongod|code-block|syntax|javascript|5297766|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

just start the mongo server from terminal
Ubuntu -
<pre><code> sudo systemctl start mongod
</code></pre>

blocks|key|1503177|text|在苹果电脑上，我不得不运行brew+services+start+mongodb-community@4.4|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1503178|查看：Install+MongoDB+Community+Edition+on+macOS|1503179|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x/^0|D|15|0|3|16|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@$9|T|A|U|1|V]]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

On a mac I had to run <code>brew services start mongodb-community@4.4</code>
Check: <a href="https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x/" rel="noreferrer">Install MongoDB Community Edition on macOS</a>

blocks|key|3880626|text|对于Windows用户：Mongo+v4.4使用以下命令：NET+STOP+MONGODB+-将MongoDB作为服务停止，如果返回"mongoDb服务未运行，则使用以下命令启动服务“NET+START+MONGODB+-将MongoDB作为服务启动。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|3880627|这对我很有效。|3880628|entityMap^0|C|A|T|G|2K|H|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@$9|L|A|M|B|C]|$9|N|A|O|B|D]|$9|P|A|Q|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|R|8|@]|E|@]|F|$]]|$1|I|3|-4|5|6|7|S|8|@]|E|@]|F|$]]]|J|$]]

For Windows users:
Mongo version 4.4
Use following commands:
<code>NET STOP MONGODB</code> – To stop MongoDB as a service,if this returns &quot;mongoDb service is not running then use below command to start service&quot;
<code>NET START MONGODB</code> – To start MongoDB as a service.
This worked for me.

blocks|key|1503206|text|在设备中搜索services.msc，然后单击开始以运行mongoDB服务器|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1503207|​|1503208|📷|atomic|1503209|1503210|在开始运行MongoDB服务器后，您将能够运行您的程序|1503211|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/205ee1d9c9231d90b03d15b463304636.png|imageAlt^0|6|C|S|A|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@$9|13|A|14|1|15]]|E|$]]|$1|K|3|G|5|6|7|16|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|17|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U|V|-4]]]]

Search services.msc in your device and click start to run the mongoDB server
<a href="https://i.stack.imgur.com/CKcTE.png" rel="noreferrer"><img src="https://i.stack.imgur.com/CKcTE.png" alt="enter image description here" /></a>
After started running MongoDB server you will able to run your program

blocks|key|1503223|text|如果你在WSL上并试图从Windows访问MongoDB，那么你必须安装Mongo+for+WSL。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1503224|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you are on WSL and trying to access MongoDB from Windows, then you have to install Mongo for WSL.

blocks|key|5297920|text|我刚刚在互联网上找到了一个解决方案，如果你正在使用最新的nodejs+(v17.x)，那么尝试将mongodb+url从localhost更新到127.0.0.1|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5297921|参考：https://www.mongodb.com/community/forums/t/mongooseserverselectionerror-connect-econnrefused-127-0-0-1-27017/123421/3|offset|length|5297922|entityMap|0|LINK|mutability|MUTABLE|url|https://www.mongodb.com/community/forums/t/mongooseserverselectionerror-connect-econnrefused-127-0-0-1-27017/123421/3^0|0|3|39|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I just found a solution in the internet ,
If you are using latest nodejs (v17.x) , then try updating mongodb url from localhost to 127.0.0.1
ref: <a href="https://www.mongodb.com/community/forums/t/mongooseserverselectionerror-connect-econnrefused-127-0-0-1-27017/123421/3" rel="nofollow noreferrer">https://www.mongodb.com/community/forums/t/mongooseserverselectionerror-connect-econnrefused-127-0-0-1-27017/123421/3</a>

blocks|key|1507661|text|我的应用程序从Nodejs+14升级到17后停止工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507662|我得到的错误是|1507663|MongoServerSelectionError:+connect+ECONNREFUSED+::1:27017|code-block|syntax|javascript|1507664|解决方案就是用0.0.0.0替换localhost。也就是说，在我的源代码中，我不得不改变|offset|length|style|CODE|1507665|const+uri+=+"mongodb://localhost:27017/";
const+client+=+new+MongoClient(uri);|1507666|至|1507667|const+uri+=+"mongodb://0.0.0.0:27017/";
const+client+=+new+MongoClient(uri);|1507668|我把这个作为一个答案，因为我在互联网上找不到解决方案，我在这个问题上浪费了很多时间……|1507669|entityMap^0|0|0|0|7|7|G|9|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@$K|12|L|13|M|N]|$K|14|L|15|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|X|$]]

My apps stopped working after upgrading from Nodejs 14 to 17.
The error I got was
<pre><code>MongoServerSelectionError: connect ECONNREFUSED ::1:27017
</code></pre>
The solution was simply replacing <code>localhost</code> by <code>0.0.0.0</code>. I.e. in my source code I had to change
<pre><code>const uri = &quot;mongodb://localhost:27017/&quot;;
const client = new MongoClient(uri);
</code></pre>
to
<pre><code>const uri = &quot;mongodb://0.0.0.0:27017/&quot;;
const client = new MongoClient(uri);
</code></pre>
I am posting this as an answer because I couldn't find the solution anywhere on the Internet and I wasted a lot of time on this one...

blocks|key|3880822|text|我自己调试了这个错误5个多小时。最终，它对我起到了作用。下面是在使用Mongoose之前检查项目的清单，以确保它们是正确的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3880823|3880824|MongoDB安装在您的系统上，在您使用'npm+run+start‘MongoDB作为服务运行之前|unordered-list-item|3880825|+mongoose代码没有任何语法错误|3880826|+use+promises+(.then())在connect函数中为mongoose|3880827|<+code+>H19如果您在URL中使用'localhost’，请尝试使用'0.0.0.0‘进行切换，反之亦然H210|3880828|一旦你完成了这一切，运行命令'node+run+start‘，希望它现在就可以工作了。要进行验证，请转到mongoDB并查看新创建的数据库。|3880829|下面是适用于我的MongoDB和Mongoose的示例代码。|3880830|const+mongoose+=+require('mongoose');

const+myFunc+=+()+=>+{
++++const+userSchema+=+mongoose.Schema({
++++++++name:+String
++++});

++++const+User+=+mongoose.model("User",+userSchema);

++++const+userObject+=+new+User({
++++++++name:+'Abhishek'
++++});

++++userObject.save((err,+data)+=>+{
++++++++if+(err)
++++++++++++console.log('Error+in+saving+=+'+%2B+err);
++++++++if+(data)
++++++++++++console.log('Saved+to+DB+=+'+%2B+data)
++++}
++++);
};

mongoose
++++.connect("mongodb://0.0.0.0/userdb")
++++.then(myFunc(),+err+=>+console.log(`Error+=+${err}`));|code-block|syntax|javascript|3880831|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|12|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|13|8|@]|9|@]|A|$]]|$1|P|3|Q|5|R|7|14|8|@]|9|@]|A|$S|T]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

I debugged this same error on my own for over 5 hours. Eventually it worked out for me. Below is a check list of items to make sure they are correct before using Mongoose.
<ul>
<li>MongoDB is installed on your system</li>
<li>MongoDB is running as a service before you use 'npm run start'</li>
<li>The mongoose code does not have any syntax errors</li>
<li>Use promises (.then()) in the connect function for mongoose</li>
<li>If you are using 'localhost' in URL, try switching it with '0.0.0.0' or vice versa</li>
</ul>
Once you have done all this, run the command 'node run start' and hopefully this should work now. To verify, go to mongoDB and see the newly created database.
Below is a sample code for MongoDB and Mongoose that worked for me.
<pre><code>const mongoose = require('mongoose');

const myFunc = () =&gt; {
 const userSchema = mongoose.Schema({
 name: String
 });

 const User = mongoose.model(&quot;User&quot;, userSchema);

 const userObject = new User({
 name: 'Abhishek'
 });

 userObject.save((err, data) =&gt; {
 if (err)
 console.log('Error in saving = ' + err);
 if (data)
 console.log('Saved to DB = ' + data)
 }
 );
};

mongoose
 .connect(&quot;mongodb://0.0.0.0/userdb&quot;)
 .then(myFunc(), err =&gt; console.log(`Error = ${err}`));

</code></pre>

blocks|key|1503299|text|我在Windows下的Node.js+v17上遇到了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1503300|在mongoose+github上发现了这个问题，并提供了一些解决方案：https://github.com/Automattic/mongoose/issues/10917|offset|length|1503301|我不得不在函数中使用127.0.0.1而不是localhost来代替localhost，这是可行的。|style|CODE|1503302|或使用管理员权限记事本编辑配置文件。打开admin+cmd，进入C:\Program+Files\MongoDB\Server\5.0\bin文件夹，输入命令notepad+mongod.cfg，然后编辑：|BOLD|1503303|net:
++port:+27017
++ipv6:+true|code-block|syntax|javascript|1503304|我必须删除bindIp:+127.0.0.1，只留下端口和ipv6，否则即使使用ipv6:+true，数据库也无法连接。然后用windows任务管理器->服务->+mongodb重启mongodb服务，使用localhost就可以了。|1503305|显然使用mongod://0.0.0.0:27017/是不安全的：mongodb.conf+bind_ip+=+127.0.0.1+does+not+work+but+0.0.0.0+works|1503306|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Automattic/mongoose/issues/10917|1|https://stackoverflow.com/questions/17588876/mongodb-conf-bind-ip-127-0-0-1-does-not-work-but-0-0-0-0-works^0|0|10|1F|0|0|A|9|M|9|Y|9|0|0|1|W|13|27|I|0|0|5|H|14|A|0|4|N|X|1S|1|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|16|8|@]|9|@$D|17|E|18|1|19]]|A|$]]|$1|F|3|G|5|6|7|1A|8|@$D|1B|E|1C|H|I]|$D|1D|E|1E|H|I]|$D|1F|E|1G|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|1H|8|@$D|1I|E|1J|H|L]|$D|1K|E|1L|H|I]|$D|1M|E|1N|H|I]]|9|@]|A|$]]|$1|M|3|N|5|O|7|1O|8|@]|9|@]|A|$P|Q]]|$1|R|3|S|5|6|7|1P|8|@$D|1Q|E|1R|H|I]|$D|1S|E|1T|H|I]]|9|@]|A|$]]|$1|T|3|U|5|6|7|1U|8|@$D|1V|E|1W|H|I]]|9|@$D|1X|E|1Y|1|1Z]]|A|$]]|$1|V|3|-4|5|6|7|20|8|@]|9|@]|A|$]]]|W|$X|$5|Y|Z|10|A|$11|12]]|13|$5|Y|Z|10|A|$11|14]]]]

I got this issue with Node.js v17 under Windows. 
Found the issue open on mongoose github with some solutions: <a href="https://github.com/Automattic/mongoose/issues/10917" rel="nofollow noreferrer">https://github.com/Automattic/mongoose/issues/10917</a>
I had to either use <code>127.0.0.1</code> instead of <code>localhost</code> in the mongoose.connect function, which worked.
Or edit the config file with admin rights notepad. Open admin cmd, go to <code>C:\Program Files\MongoDB\Server\5.0\bin</code> folder, enter command <code>notepad mongod.cfg</code> then edit:
<pre><code>net:
 port: 27017
 ipv6: true
</code></pre>
I had to remove <code>bindIp: 127.0.0.1</code>, leaving only port and ipv6, otherwise database wouldn't connect even with <code>ipv6: true</code>.
Then restart mongodb service with windows task manager -&gt; services -&gt; mongodb, and using localhost would work.
Apparently using <code>mongod://0.0.0.0:27017/</code> is not safe: <a href="https://stackoverflow.com/questions/17588876/mongodb-conf-bind-ip-127-0-0-1-does-not-work-but-0-0-0-0-works">mongodb.conf bind_ip = 127.0.0.1 does not work but 0.0.0.0 works</a>

blocks|key|5298118|text|检查.sock文件的位置。在我的例子中，它位于/tmp文件夹中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5298119|然后运行以下命令。|5298120|chown+mongodb:mongodb+/tmp/mongodb-27017.sock

sudo+systemctl+start+mongod

mongosh|code-block|syntax|javascript|5298121|这对我很有效。|5298122|For+more+reference+|offset|length|5298123|entityMap|0|LINK|mutability|MUTABLE|url|https://askubuntu.com/questions/823288/mongodb-loads-but-breaks-returning-status-14#:%257E:text=According%2520to%2520the%2520mongo%252Ddocs,performing%2520a%2520clean%2520shut%2520down.%2522^0|0|0|0|0|0|J|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Check where your .sock file is located. For my case, it was in /tmp folder.
Then run the following commands.
<pre><code>chown mongodb:mongodb /tmp/mongodb-27017.sock

sudo systemctl start mongod

mongosh
</code></pre>
This worked for me.
<a href="https://askubuntu.com/questions/823288/mongodb-loads-but-breaks-returning-status-14#:%7E:text=According%20to%20the%20mongo%2Ddocs,performing%20a%20clean%20shut%20down.%22">For more reference </a>

I'm using NodeJS wih MongoDB using mongodb package. When I run mongod command it works fine and gives &quot;waiting for connection on port 27017&quot;. So, mongod seems to be working. But MongoClient does not work and gives error when I run node index.js command-
<pre><code>MongoError: failed to connect to server [localhost:27017] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27017]
</code></pre>
<a href="https://i.stack.imgur.com/lXL3f.png" rel="noreferrer"><img src="https://i.stack.imgur.com/lXL3f.png" alt="enter image description here" /></a>
I have install mongo db 3.4 and my code is-
<pre><code>var MongoClient = require('mongodb').MongoClient;
var dburl = &quot;mongodb://localhost:27017/test&quot;;
MongoClient.connect(dburl, function(err, db) {
 if (err) {
 throw err;
 }
 console.log('db connected');
 db.close();
});
</code></pre>
I have created data/db directories on root and given write permissions.
mongod.conf file takes db path as-
storage:
dbPath: /var/lib/mongo
But it seems that it is actually taking db path as data/db and not var/lib/mongo
It working earlier but suddenly stopped.

MongoError: connect ECONNREFUSED 127.0.0.1:27017

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用的是MongoDB包中的NodeJS和mongodb。当我运行mongod命令时，它工作得很好，并给出了“正在等待端口27017上的连接”。因此，巫师似乎在起作用。但是当我运行node index.js命令时，MongoClient不工作并给出错误-MongoError: failed to connect to...

问MongoError: connect ECONNREFUSED 127.0.0.1:27017
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