# Creation of external objects in function node fails (solved)

**URL:** <https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480>\
**Category:** General\
**Created:** [30 January 2022 02:39 UTC](https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480 "2022-01-30T02:39:08Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![mickym2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mickym2/32/36128_2.png) [@mickym2](https://discourse.nodered.org/u/mickym2)\
**Post date:** [30 January 2022 02:39 UTC](https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480/1 "2022-01-30T02:39:08Z")

</div>

I have a problem to understand or to use external modules with new features in the function node.

I tried it first the [node-json-db](https://github.com/Belphemur/node-json-db) library and then later with the [mongodb - npm](https://www.npmjs.com/package/mongodb) library.  
At least for mongodb I saw that there are nodes available.

However I want to understand why I cannot user external libraries in my function nodes. I always get errors , if I want to create an external object - that it is no constructor.

In general it seems that the definition in the function nodes are correct - as the modules are automatically installed in the users node\_modules directory.

![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/2/b/2b8cd197080bac5b948febc7cd056f47fa83376b.png)

I defined the external module in the setup tab of the function node:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/5/4/5402d48bdc520f8a2418cc17461b035402223257.png)

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/5/651b3a0037df93551f57de5a854736163171b657.png)

I always get the error that it is not a constructor to create the object of an external lib .

This happens with more than one lib.  
I tried everything and checked settings.js - and as you can see the module itself has been installed.

So here is my settings.js - I recreated it with the new command node-red admin init.

So even if nodes may be already available - it would be nice to understand what is wrong, as I want to use perhaps a nodejs lib in case there is no node available.

I appreciate any help. Here is my settings.js - if this will help to analyse the error:

> **Zusammenfassung**
>
> ```auto
> /**
> * Node-RED Settings created at Sun, 30 Jan 2022 01:27:56 GMT
> *
> * It can contain any valid JavaScript code that will get run when Node-RED
> * is started.
> *
> * Lines that start with // are commented out.
> * Each entry should be separated from the entries above and below by a comma ','
> *
> * For more information about individual settings, refer to the documentation:
> * https://nodered.org/docs/user-guide/runtime/configuration
> *
> * The settings are split into the following sections:
> * - Flow File and User Directory Settings
> * - Security
> * - Server Settings
> * - Runtime Settings
> * - Editor Settings
> * - Node Settings
> *
> **/
> 
> module.exports = {
> 
> / *******************************************************************************
> * Flow File and User Directory Settings
> * - flowFile
> * - credentialSecret
> * - flowFilePretty
> * - userDir
> * - nodesDir
> ****************************************************************************** /
> 
> / **The file containing the flows. If not set, defaults to flows_<hostname>.json** /
> flowFile: "flows.json",
> 
> /** By default, credentials are encrypted in storage using a generated key. To
> * specify your own secret, set the following property.
> * If you want to disable encryption of credentials, set this property to false.
> * Note: once you set this property, do not change it - doing so will prevent
> * node-red from being able to decrypt your existing credentials and they will be
> * lost.
> */
> //credentialSecret: "a-secret-key",
> 
> /** By default, the flow JSON will be formatted over multiple lines making
> * it easier to compare changes when using version control.
> * To disable pretty-printing of the JSON set the following property to false.
> */
> flowFilePretty: true,
> 
> /** By default, all user data is stored in a directory called `.node-red` under
> * the user's home directory. To use a different location, the following
> * property can be used
> */
> //userDir: '/home/nol/.node-red/',
> 
> /** Node-RED scans the `nodes` directory in the userDir to find local node files.
> * The following property can be used to specify an additional directory to scan.
> */
> //nodesDir: '/home/nol/.node-red/nodes',
> 
> / *******************************************************************************
> * Security
> * - adminAuth
> * - https
> * - httpsRefreshInterval
> * - requireHttps
> * - httpNodeAuth
> * - httpStaticAuth
> ****************************************************************************** /
> 
> /** To password protect the Node-RED editor and admin API, the following
> * property can be used. See http://nodered.org/docs/security.html for details.
> */
> //adminAuth: {
> // type: "credentials",
> // users: [{
> // username: "admin",
> // password: "$2a$08$zZWtXTja0fB1pzD4sHCMyOCMYz2Z6dNbM6tl8sJogENOMcxWV9DN.",
> // permissions: "*"
> // }]
> //},
>     
> /** The following property can be used to enable HTTPS
> * This property can be either an object, containing both a (private) key
> * and a (public) certificate, or a function that returns such an object.
> * See http://nodejs.org/api/https.html#https_https_createserver_options_requestlistener
> * for details of its contents.
> */
> 
> /** Option 1: static object */
> //https: {
> // key: require("fs").readFileSync('privkey.pem'),
> // cert: require("fs").readFileSync('cert.pem')
> //},
> 
> /** Option 2: function that returns the HTTP configuration object */
> // https: function() {
> // // This function should return the options object, or a Promise
> // // that resolves to the options object
> // return {
> // key: require("fs").readFileSync('privkey.pem'),
> // cert: require("fs").readFileSync('cert.pem')
> // }
> // },
> 
> /** If the `https` setting is a function, the following setting can be used
> * to set how often, in hours, the function will be called. That can be used
> * to refresh any certificates.
> */
> //httpsRefreshInterval : 12,
> 
> /** The following property can be used to cause insecure HTTP connections to
> * be redirected to HTTPS.
> */
> //requireHttps: true,
> 
> /** To password protect the node-defined HTTP endpoints (httpNodeRoot),
> * including node-red-dashboard, or the static content (httpStatic), the
> * following properties can be used.
> * The `pass` field is a bcrypt hash of the password.
> * See http://nodered.org/docs/security.html#generating-the-password-hash
> */
> //httpNodeAuth: {user:"user",pass:"$2a$08$zZWtXTja0fB1pzD4sHCMyOCMYz2Z6dNbM6tl8sJogENOMcxWV9DN."},
> //httpStaticAuth: {user:"user",pass:"$2a$08$zZWtXTja0fB1pzD4sHCMyOCMYz2Z6dNbM6tl8sJogENOMcxWV9DN."},
> 
> / *******************************************************************************
> * Server Settings
> * - uiPort
> * - uiHost
> * - apiMaxLength
> * - httpServerOptions
> * - httpAdminRoot
> * - httpAdminMiddleware
> * - httpNodeRoot
> * - httpNodeCors
> * - httpNodeMiddleware
> * - httpStatic
> ****************************************************************************** /
> 
> /** the tcp port that the Node-RED web server is listening on */
> uiPort: process.env.PORT || 1880,
> 
> /** By default, the Node-RED UI accepts connections on all IPv4 interfaces.
> * To listen on all IPv6 addresses, set uiHost to "::",
> * The following property can be used to listen on a specific interface. For
> * example, the following would only allow connections from the local machine.
> */
> //uiHost: "127.0.0.1",
> 
> /** The maximum size of HTTP request that will be accepted by the runtime api.
> * Default: 5mb
> */
> //apiMaxLength: '5mb',
> 
> /** The following property can be used to pass custom options to the Express.js
> * server used by Node-RED. For a full list of available options, refer
> * to http://expressjs.com/en/api.html#app.settings.table
> */
> //httpServerOptions: { },
> 
> /** By default, the Node-RED UI is available at http://localhost:1880/
> * The following property can be used to specify a different root path.
> * If set to false, this is disabled.
> */
> //httpAdminRoot: '/admin',
> 
> /** The following property can be used to add a custom middleware function
> * in front of all admin http routes. For example, to set custom http
> * headers. It can be a single function or an array of middleware functions.
> */
> // httpAdminMiddleware: function(req,res,next) {
> // // Set the X-Frame-Options header to limit where the editor
> // // can be embedded
> // //res.set('X-Frame-Options', 'sameorigin');
> // next();
> // },
> 
> /** Some nodes, such as HTTP In, can be used to listen for incoming http requests.
> * By default, these are served relative to '/'. The following property
> * can be used to specifiy a different root path. If set to false, this is
> * disabled.
> */
> //httpNodeRoot: '/red-nodes',
> 
> /** The following property can be used to configure cross-origin resource sharing
> * in the HTTP nodes.
> * See https://github.com/troygoode/node-cors#configuration-options for
> * details on its contents. The following is a basic permissive set of options:
> */
> //httpNodeCors: {
> // origin: "*",
> // methods: "GET,PUT,POST,DELETE"
> //},
> 
> /** If you need to set an http proxy please set an environment variable
> * called http_proxy (or HTTP_PROXY) outside of Node-RED in the operating system.
> * For example - http_proxy=http://myproxy.com:8080
> * (Setting it here will have no effect)
> * You may also specify no_proxy (or NO_PROXY) to supply a comma separated
> * list of domains to not proxy, eg - no_proxy=.acme.co,.acme.co.uk
> */
> 
> /** The following property can be used to add a custom middleware function
> * in front of all http in nodes. This allows custom authentication to be
> * applied to all http in nodes, or any other sort of common request processing.
> * It can be a single function or an array of middleware functions.
> */
> //httpNodeMiddleware: function(req,res,next) {
> // // Handle/reject the request, or pass it on to the http in node by calling next();
> // // Optionally skip our rawBodyParser by setting this to true;
> // //req.skipRawBodyParser = true;
> // next();
> //},
> 
> /** When httpAdminRoot is used to move the UI to a different root path, the
> * following property can be used to identify a directory of static content
> * that should be served at http://localhost:1880/.
> */
> //httpStatic: '/home/nol/node-red-static/',
> 
> / *******************************************************************************
> * Runtime Settings
> * - lang
> * - logging
> * - contextStorage
> * - exportGlobalContextKeys
> * - externalModules
> ****************************************************************************** /
> 
> /** Uncomment the following to run node-red in your preferred language.
> * Available languages include: en-US (default), ja, de, zh-CN, zh-TW, ru, ko
> * Some languages are more complete than others.
> */
> // lang: "de",
> 
> /** Configure the logging output */
> logging: {
> /** Only console logging is currently supported */
> console: {
> /** Level of logging to be recorded. Options are:
> * fatal - only those errors which make the application unusable should be recorded
> * error - record errors which are deemed fatal for a particular request + fatal errors
> * warn - record problems which are non fatal + errors + fatal errors
> * info - record information about the general running of the application + warn + error + fatal errors
> * debug - record information which is more verbose than info + info + warn + error + fatal errors
> * trace - record very detailed logging + debug + info + warn + error + fatal errors
> * off - turn off all logging (doesn't affect metrics or audit)
> */
> level: "info",
> /** Whether or not to include metric events in the log output */
> metrics: false,
> /** Whether or not to include audit events in the log output */
> audit: false
> }
> },
> 
> /** Context Storage
> * The following property can be used to enable context storage. The configuration
> * provided here will enable file-based context that flushes to disk every 30 seconds.
> * Refer to the documentation for further options: https://nodered.org/docs/api/context/
> */
> //contextStorage: {
> // default: {
> // module:"localfilesystem"
> // },
> //},
> 
> /** `global.keys()` returns a list of all properties set in global context.
> * This allows them to be displayed in the Context Sidebar within the editor.
> * In some circumstances it is not desirable to expose them to the editor. The
> * following property can be used to hide any property set in `functionGlobalContext`
> * from being list by `global.keys()`.
> * By default, the property is set to false to avoid accidental exposure of
> * their values. Setting this to true will cause the keys to be listed.
> */
> exportGlobalContextKeys: false,
> 
> /** Configure how the runtime will handle external npm modules.
> * This covers:
> * - whether the editor will allow new node modules to be installed
> * - whether nodes, such as the Function node are allowed to have their
> * own dynamically configured dependencies.
> * The allow/denyList options can be used to limit what modules the runtime
> * will install/load. It can use '*' as a wildcard that matches anything.
> */
> externalModules: {
> // autoInstall: false, /** Whether the runtime will attempt to automatically install missing modules */
> // autoInstallRetry: 30, /** Interval, in seconds, between reinstall attempts */
> // palette: { /** Configuration for the Palette Manager */
> // allowInstall: true, /** Enable the Palette Manager in the editor */
> // allowUpload: true, /** Allow module tgz files to be uploaded and installed */
> // allowList: [],
> // denyList: []
> // },
> // modules: { /** Configuration for node-specified modules */
> // allowInstall: true,
> // allowList: [],
> // denyList: []
> // }
> },
> 
> / *******************************************************************************
> * Editor Settings
> * - disableEditor
> * - editorTheme
> ****************************************************************************** /
> 
> /** The following property can be used to disable the editor. The admin API
> * is not affected by this option. To disable both the editor and the admin
> * API, use either the httpRoot or httpAdminRoot properties
> */
> //disableEditor: false,
> 
> /** Customising the editor
> * See https://nodered.org/docs/user-guide/runtime/configuration#editor-themes
> * for all available options.
> */
> editorTheme: {
> /** The following property can be used to set a custom theme for the editor.
> * See https://github.com/node-red-contrib-themes/theme-collection for
> * a collection of themes to chose from.
> */
> //theme: "",
> palette: {
> /** The following property can be used to order the categories in the editor
> * palette. If a node's category is not in the list, the category will get
> * added to the end of the palette.
> * If not set, the following default order is used:
> */
> //categories: ['subflows', 'common', 'function', 'network', 'sequence', 'parser', 'storage'],
> },
> projects: {
> /** To enable the Projects feature, set this value to true */
> enabled: false,
> workflow: {
> /** Set the default projects workflow mode.
> * - manual - you must manually commit changes
> * - auto - changes are automatically committed
> * This can be overridden per-user from the 'Git config'
> * section of 'User Settings' within the editor
> */
> mode: "manual"
> }
> },
> codeEditor: {
> /** Select the text editor component used by the editor.
> * Defaults to "ace", but can be set to "ace" or "monaco"
> */
> lib: "monaco",
> options: {
> /** The follow options only apply if the editor is set to "monaco"
> *
> * theme - must match the file name of a theme in
> * packages/node_modules/@node-red/editor-client/src/vendor/monaco/dist/theme
> * e.g. "tomorrow-night", "upstream-sunburst", "github", "my-theme"
> */
> theme: "vs",
> /** other overrides can be set e.g. fontSize, fontFamily, fontLigatures etc.
> * for the full list, see https://microsoft.github.io/monaco-editor/api/interfaces/monaco.editor.istandaloneeditorconstructionoptions.html
> */
> //fontSize: 14,
> //fontFamily: "Cascadia Code, Fira Code, Consolas, 'Courier New', monospace",
> //fontLigatures: true,
> }
> }
> },
> 
> / *******************************************************************************
> * Node Settings
> * - fileWorkingDirectory
> * - functionGlobalContext
> * - functionExternalModules
> * - nodeMessageBufferMaxLength
> * - ui (for use with Node-RED Dashboard)
> * - debugUseColors
> * - debugMaxLength
> * - execMaxBufferSize
> * - httpRequestTimeout
> * - mqttReconnectTime
> * - serialReconnectTime
> * - socketReconnectTime
> * - socketTimeout
> * - tcpMsgQueueSize
> * - inboundWebSocketTimeout
> * - tlsConfigDisableLocalFiles
> * - webSocketNodeVerifyClient
> ****************************************************************************** /
> 
> /** The working directory to handle relative file paths from within the File nodes
> * defaults to the working directory of the Node-RED process.
> */
> //fileWorkingDirectory: "",
> 
> /** Allow the Function node to load additional npm modules directly */
> functionExternalModules: true,
> 
> /** The following property can be used to set predefined values in Global Context.
> * This allows extra node modules to be made available with in Function node.
> * For example, the following:
> * functionGlobalContext: { os:require('os') }
> * will allow the `os` module to be accessed in a Function node using:
> * global.get("os")
> */
> functionGlobalContext: {
> // os:require('os'),
> },
> 
> /** The maximum number of messages nodes will buffer internally as part of their
> * operation. This applies across a range of nodes that operate on message sequences.
> * defaults to no limit. A value of 0 also means no limit is applied.
> */
> //nodeMessageBufferMaxLength: 0,
> 
> /** If you installed the optional node-red-dashboard you can set it's path
> * relative to httpNodeRoot
> * Other optional properties include
> * readOnly:{boolean},
> * middleware:{function or array}, (req,res,next) - http middleware
> * ioMiddleware:{function or array}, (socket,next) - socket.io middleware
> */
> //ui: { path: "ui" },
> 
> /** Colourise the console output of the debug node */
> //debugUseColors: true,
> 
> /** The maximum length, in characters, of any message sent to the debug sidebar tab */
> debugMaxLength: 1000,
> 
> /** Maximum buffer size for the exec node. Defaults to 10Mb */
> //execMaxBufferSize: 10000000,
> 
> /** Timeout in milliseconds for HTTP request connections. Defaults to 120s */
> //httpRequestTimeout: 120000,
> 
> /** Retry time in milliseconds for MQTT connections */
> mqttReconnectTime: 15000,
> 
> /** Retry time in milliseconds for Serial port connections */
> serialReconnectTime: 15000,
> 
> /** Retry time in milliseconds for TCP socket connections */
> //socketReconnectTime: 10000,
> 
> /** Timeout in milliseconds for TCP server socket connections. Defaults to no timeout */
> //socketTimeout: 120000,
> 
> /** Maximum number of messages to wait in queue while attempting to connect to TCP socket
> * defaults to 1000
> */
> //tcpMsgQueueSize: 2000,
> 
> /** Timeout in milliseconds for inbound WebSocket connections that do not
> * match any configured node. Defaults to 5000
> */
> //inboundWebSocketTimeout: 5000,
> 
> /** To disable the option for using local files for storing keys and
> * certificates in the TLS configuration node, set this to true.
> */
> //tlsConfigDisableLocalFiles: true,
> 
> /** The following property can be used to verify websocket connection attempts.
> * This allows, for example, the HTTP request headers to be checked to ensure
> * they include valid authentication information.
> */
> //webSocketNodeVerifyClient: function(info) {
> // /**'info' has three properties:
> // * - origin : the value in the Origin header
> // * - req : the HTTP request
> // * - secure : true if req.connection.authorized or req.connection.encrypted is set
> // *
> // * The function should return true if the connection should be accepted, false otherwise.
> // *
> // * Alternatively, if this function is defined to accept a second argument, callback,
> // * it can be used to verify the client asynchronously.
> // * The callback takes three arguments:
> // * - result : boolean, whether to accept the connection or not
> // * - code : if result is false, the HTTP error status to return
> // * - reason: if result is false, the HTTP reason string to return
> // */
> //},
> }
> 
> ```

Enabling options in the externalModules object will not solve the problem. I hope someone can help me to understand the problem.

---

<div class="post-metadata">

**Author:** ![HaroldPetersInskipp](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/haroldpetersinskipp/32/42319_2.png) [@HaroldPetersInskipp](https://discourse.nodered.org/u/HaroldPetersInskipp)\
**Post date:** [30 January 2022 03:01 UTC](https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480/2 "2022-01-30T03:01:22Z")

</div>

Untested but try this:  
Change it to import as "mongodb". Then add the line

```auto
const MongoClient = mongodb.MongoClient;

```

at the top of your function.

Personally I just use node-red-node-mongodb

---

<div class="post-metadata">

**Author:** ![UnborN](https://avatars.discourse-cdn.com/v4/letter/u/4491bb/32.png) [@UnborN](https://discourse.nodered.org/u/UnborN)\
**Post date:** [30 January 2022 03:04 UTC](https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480/3 "2022-01-30T03:04:51Z")

</div>

```auto
const { MongoClient } = mongodb;
// Replace the uri string with your MongoDB deployment's connection string.
const uri = "mongodb://localhost:27017";

const client = new MongoClient(uri);

async function run() {
  try {
    await client.connect();
    const database = client.db('nodered'); // db name
    const temperatures = database.collection('temperatures'); // collection name
    
    const query = { }; // any 
    const result = await temperatures.findOne(query); // findOne Document
    node.send({payload: result});
  } finally {
    // Ensures that the client will close when you finish/error
    await client.close();
  }
}
run().catch(console.dir);

```

---

<div class="post-metadata">

**Author:** ![mickym2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mickym2/32/36128_2.png) [@mickym2](https://discourse.nodered.org/u/mickym2)\
**Post date:** [30 January 2022 03:29 UTC](https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480/4 "2022-01-30T03:29:31Z")

</div>

Wow - thank you very much - it seems that is working.

```auto
const MongoClient = mongodb.MongoClient;
const client = new MongoClient(url);

```

so more or less - I missed only this line:

```auto
const MongoClient = mongodb.MongoClient;

```

I try it with the other lib - and I am not sure - if I understand what this line really does. 🙂 But I am happy that it works in general. Many thanks!

---

<div class="post-metadata">

**Author:** ![HaroldPetersInskipp](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/haroldpetersinskipp/32/42319_2.png) [@HaroldPetersInskipp](https://discourse.nodered.org/u/HaroldPetersInskipp)\
**Post date:** [30 January 2022 03:32 UTC](https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480/5 "2022-01-30T03:32:46Z")

</div>

I believe it is "destructuring", you can read more here: [Destructuring Nested Objects. I love destructuring. However, as I use… | by Ronald Chen | Medium](https://medium.com/@pyrolistical/destructuring-nested-objects-9dabdd01a3b8)

---

<div class="post-metadata">

**Author:** ![mickym2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mickym2/32/36128_2.png) [@mickym2](https://discourse.nodered.org/u/mickym2)\
**Post date:** [30 January 2022 03:55 UTC](https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480/6 "2022-01-30T03:55:47Z")

</div>

Ok - I think more or less - it is just to access the exported property or object of or within the library.

What I begin to understand is, that the name of the variable in the Setup Tab contains the library in total and then I need to address the exported function or object.

so my access is also working now.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/5/0/50bf7c5f770663708cc77e5650ab607f8dc52d0c.png)

Then this code is also working:

```auto
const JsonDB = nodeJsonDb.JsonDB;
const Config = nodeJsonDbDistLibJsonDBConfig.Config;

var db = new JsonDB(new Config("myDataBase", true, true, '/'));

db.push('/test1','super test');

```

and myDataBase.json looks great:

```auto
{
    "test1": "super test"
}

```

So many thanks - I guess - I understand a little bit more. 🙂

Great support - here. 👍 👍 👍

---

<div class="post-metadata">

**Author:** ![mickym2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mickym2/32/36128_2.png) [@mickym2](https://discourse.nodered.org/u/mickym2)\
**Post date:** [30 January 2022 04:05 UTC](https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480/7 "2022-01-30T04:05:11Z")

</div>

> [@HaroldPetersInskipp](#):
>
> Personally I just use node-red-node-mongodb

Yes - I saw this node as well - and I will use it. But I wanted to understand in general, why I couldn't create objects of an external library. It is not so easy to get sometimes the small things which are normal for the professionals - even if I spent plenty of times in google. 😉

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [13 February 2022 04:05 UTC](https://discourse.nodered.org/t/creation-of-external-objects-in-function-node-fails-solved/57480/8 "2022-02-13T04:05:28Z")

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