blocks|key|320513|text|以下是将ObjectId转换为字符串的工作示例|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|320514|>+a=db.dfgfdgdfg.findOne()
{+"_id"+:+ObjectId("518cbb1389da79d3a25453f9"),+"d"+:+1+}
>+a['_id']
ObjectId("518cbb1389da79d3a25453f9")
>+a['_id'].toString+//+This+line+shows+you+what+the+prototype+does
function+()+{
++++return+"ObjectId("+%2B+tojson(this.str)+%2B+")";
}
>+a['_id'].str+//+Access+the+property+directly
518cbb1389da79d3a25453f9
>+a['_id'].toString()
ObjectId("518cbb1389da79d3a25453f9")+//+Shows+the+object+syntax+in+string+form
>+""%2Ba['_id']+
518cbb1389da79d3a25453f9+//+Gives+the+hex+string|code-block|syntax|javascript|320515|我尝试了其他各种功能，如toHexString()，但没有成功。|320516|entityMap^0|4|8|0|0|C|D|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Here is a working example of converting the <code>ObjectId</code> in to a string

<pre><code>&gt; a=db.dfgfdgdfg.findOne()
{ "_id" : ObjectId("518cbb1389da79d3a25453f9"), "d" : 1 }
&gt; a['_id']
ObjectId("518cbb1389da79d3a25453f9")
&gt; a['_id'].toString // This line shows you what the prototype does
function () {
 return "ObjectId(" + tojson(this.str) + ")";
}
&gt; a['_id'].str // Access the property directly
518cbb1389da79d3a25453f9
&gt; a['_id'].toString()
ObjectId("518cbb1389da79d3a25453f9") // Shows the object syntax in string form
&gt; ""+a['_id'] 
518cbb1389da79d3a25453f9 // Gives the hex string
</code></pre>

Did try various other functions like <code>toHexString()</code> with no success.

blocks|key|320614|text|在shell中|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|320615|ObjectId("507f191e810c19729de860ea").str|style|CODE|320616|在js+using+the+native+driver+for+node中|320617|objectId.toHexString()|320618|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.mongodb.com/manual/reference/method/ObjectId/|1|http://mongodb.github.io/node-mongodb-native/2.0/api/ObjectID.html^0|1|5|0|0|0|14|0|4|W|1|0|0|M|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@$A|10|B|11|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|J|3|K|5|6|7|16|8|@$A|17|B|18|F|G]]|9|@]|C|$]]|$1|L|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|O|P|Q|C|$R|U]]]]

in the <a href="https://docs.mongodb.com/manual/reference/method/ObjectId/" rel="noreferrer">shell</a>

<code>ObjectId("507f191e810c19729de860ea").str</code>

in js <a href="http://mongodb.github.io/node-mongodb-native/2.0/api/ObjectID.html" rel="noreferrer">using the native driver for node</a>

<code>objectId.toHexString()</code>

blocks|key|103997|text|使用toString：var+stringId+=+objectId.toString()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|103998|与最新的节点MongoDB本机驱动程序(v3.0%2B)配合使用：|103999|http://mongodb.github.io/node-mongodb-native/3.0/|104000|entityMap|0|LINK|mutability|MUTABLE|url^0|B|Y|0|0|0|1D|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|U|8|@]|D|@$9|V|A|W|1|X]]|E|$]]|$1|J|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|I]]]]

Use toString:
<code>var stringId = objectId.toString()</code>

Works with the latest Node MongoDB Native driver (v3.0+):

<a href="http://mongodb.github.io/node-mongodb-native/3.0/" rel="noreferrer">http://mongodb.github.io/node-mongodb-native/3.0/</a>

blocks|key|103619|text|实际上，你可以尝试这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|103620|>+a['_id']
ObjectId("518cbb1389da79d3a25453f9")
>+a['_id']+%2B+''
"518cbb1389da79d3a25453f9"|code-block|syntax|javascript|103621|ObjectId对象%2B字符串将转换为字符串对象。|103622|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|$]]

Acturally, you can try this: 

<pre><code>&gt; a['_id']
ObjectId("518cbb1389da79d3a25453f9")
&gt; a['_id'] + ''
"518cbb1389da79d3a25453f9"
</code></pre>

ObjectId object + String will convert to String object.

blocks|key|103832|text|如果有人在Meteorjs中使用，可以尝试：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|103833|在服务器中：ObjectId(507f191e810c19729de860ea)._str。|offset|length|style|CODE|103834|在模板中：{{+collectionItem._id._str+}}。|103835|entityMap^0|0|6|13|0|5|T|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|$]]|$1|H|3|I|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

<h1>If someone use in Meteorjs, can try:</h1>

In server: <code>ObjectId(507f191e810c19729de860ea)._str</code>.

In template: <code>{{ collectionItem._id._str }}</code>.

blocks|key|320610|text|假设OP想要获取ObjectId的十六进制字符串值，使用Mongo2.2或更高版本，valueOf()方法将对象的表示形式返回为十六进制字符串。这也是通过str属性实现的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|320611|这篇文章的链接给出了所有的细节，这里的危险是使用了一种从旧版本改变的技术，例如toString()。|320612|entityMap^0|16|9|25|3|0|13|A|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

Assuming the OP wants to get the hexadecimal string value of the ObjectId, using Mongo 2.2 or above, the <code>valueOf()</code> method returns the representation of the object as a hexadecimal string. This is also achieved with the <code>str</code> property.

The link on anubiskong's post gives all the details, the danger here is to use a technique which has changed from older versions e.g. <code>toString()</code>.

blocks|key|321011|text|在Js中简单地做：_id.toString()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|321012|例如：|321013|const+myMongoDbObjId+=+ObjectID('someId');
const+strId+=+myMongoDbObjId.toString();
console.log(typeof+strId);+//+string|code-block|syntax|javascript|321014|entityMap^0|9|E|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

In Js do simply: <code>_id.toString()</code>
For example:
<pre><code>const myMongoDbObjId = ObjectID('someId');
const strId = myMongoDbObjId.toString();
console.log(typeof strId); // string
</code></pre>

blocks|key|320682|text|这样就行了，您有一个mongodb对象：ObjectId(507f191e810c19729de860ea)，要获取_id的字符串值，您只需这样说|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|320683|ObjectId(507f191e810c19729de860ea).valueOf();|code-block|syntax|javascript|320684|entityMap^0|K|Y|1M|3|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

this works, You have mongodb object: <code>ObjectId(507f191e810c19729de860ea)</code>,
to get string value of <code>_id</code>, you just say
<pre><code>ObjectId(507f191e810c19729de860ea).valueOf();
</code></pre>

blocks|key|104097|text|在Javascript中，String()让这一切变得很容易|type|unstyled|depth|inlineStyleRanges|entityRanges|data|104098|const+id+=+String(ObjectID)|code-block|syntax|javascript|104099|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|$]]

In Javascript, String() make it easy
<pre><code>const id = String(ObjectID)
</code></pre>

blocks|key|320795|text|只需使用以下代码：_id.$oid|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|320796|然后你就会得到ObjectId字符串。这是与对象一起提供的。|320797|entityMap^0|9|8|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

Just use this : <code>_id.$oid</code>

And you get the ObjectId string. This come with the object.

blocks|key|104040|text|觉得这真的很有趣，但它对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|104041|++++db.my_collection.find({}).forEach((elm)=>{

++++let+value+=+new+String(elm.USERid);//gets+the+string+version+of+the+ObjectId+which+in+turn+changes+the+datatype+to+a+string.

++++let+result+=+value.split("(")[1].split(")")[0].replace(/%5E"(.*)"$/,+'$1');//this+removes+the+objectid+completely+and+the+quote+
++++delete+elm["USERid"]
++++elm.USERid+=+result
++++db.my_collection.save(elm)
++++})|code-block|syntax|javascript|104042|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|$]]

Found this really funny but it worked for me:

<pre><code> db.my_collection.find({}).forEach((elm)=&gt;{

 let value = new String(elm.USERid);//gets the string version of the ObjectId which in turn changes the datatype to a string.

 let result = value.split("(")[1].split(")")[0].replace(/^"(.*)"$/, '$1');//this removes the objectid completely and the quote 
 delete elm["USERid"]
 elm.USERid = result
 db.my_collection.save(elm)
 })
</code></pre>

blocks|key|320980|text|您可以使用字符串格式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|320981|​|320982|const+stringId+=+`${objectId}`;|code-block|syntax|javascript|320983|320984|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

You can use string formatting.
<div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const stringId = `${objectId}`;</code></pre>
</div>
</div>

blocks|key|104074|text|您可以使用String|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|104075|String(a['_id'])|code-block|syntax|javascript|104076|entityMap^0|5|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You could use <code>String</code>
<pre><code>String(a['_id'])
</code></pre>

blocks|key|321026|text|v4的文档(目前是它的最新版本)+MongoDB+NodeJS驱动程序说:+ObjectId的toHexString()方法以24个字符的十六进制字符串表示形式返回ObjectId+id。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|321027|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|$]]

Documentation of v4 (right now it's latest version) MongoDB NodeJS Driver says: Method toHexString() of ObjectId returns the ObjectId id as a 24 character hex string representation.

blocks|key|321048|text|在Mongoose中，您可以在ObjectId上使用toString()方法来获取24个字符的十六进制字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|321049|Mongoose+documentation|offset|length|321050|entityMap|0|LINK|mutability|MUTABLE|url|https://mongoosejs.com/docs/5.x/docs/schematypes.html#objectids^0|0|0|M|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]]]]

In Mongoose, you can use toString() method on ObjectId to get a 24-character hexadecimal string.
<a href="https://mongoosejs.com/docs/5.x/docs/schematypes.html#objectids" rel="nofollow noreferrer">Mongoose documentation</a>

blocks|key|320842|text|使用这个简单的技巧，your-object.$id|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|320843|我得到了一个mongo+did数组，这是我所做的。|320844|jquery：|320845|...
success:+function+(res)+{
+++console.log('without+json+res',res);
++++//without+json+res+{"success":true,"message":"+Record+updated.","content":[{"$id":"58f47254b06b24004338ffba"},{"$id":"58f47254b06b24004338ffbb"}],"dbResponse":"ok"}

var+obj+=+$.parseJSON(res);

if(obj.content+!==null){
++++$.each(obj.content,+function(i,v){
++++++++console.log('Id==>',+v.$id);
++++});
}

...|code-block|syntax|javascript|320846|entityMap^0|A|F|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|U|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|V|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

Use this simple trick, <code>your-object.$id</code>

I am getting an array of mongo Ids, here is what I did.

jquery:

<pre><code>...
success: function (res) {
 console.log('without json res',res);
 //without json res {"success":true,"message":" Record updated.","content":[{"$id":"58f47254b06b24004338ffba"},{"$id":"58f47254b06b24004338ffbb"}],"dbResponse":"ok"}

var obj = $.parseJSON(res);

if(obj.content !==null){
 $.each(obj.content, function(i,v){
 console.log('Id==&gt;', v.$id);
 });
}

...
</code></pre>

I want to convert ObjectID (Mongodb) to String in JavaScript.
When I get a Object form MongoDB. it like as a object has: timestamp, second, inc, machine.
I can't convert to string.

Convert ObjectID (Mongodb) to String in JavaScript

服务器

MongoDB

我想在JavaScript中将ObjectID (Mongodb)转换为字符串。当我从MongoDB获取一个对象时。它就像一个对象一样有:时间戳，秒，公司，机器。我不能转换为字符串。

问在JavaScript中将ObjectID (Mongodb)转换为字符串
EN

回答 16

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问在JavaScript中将ObjectID (Mongodb)转换为字符串
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