# Cannot call functions of config node
**URL:** https://discourse.nodered.org/t/cannot-call-functions-of-config-node/85929
**Category:** Developing Nodes
**Created:** [26 February 2024 13:52 UTC](https://discourse.nodered.org/t/cannot-call-functions-of-config-node/85929 "2024-02-26T13:52:38Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@hansimeister](https://discourse.nodered.org/u/hansimeister)
#### Post date: [26 February 2024 13:52 UTC](https://discourse.nodered.org/t/cannot-call-functions-of-config-node/85929/1 "2024-02-26T13:52:38Z")
Hi there!
I am trying to access a function namely getToken() defined in my config node in another node. However if I do it like the following:
```auto
var server = RED.nodes.node(node.server);
console.log("server", server, "host", server.host);
console.log("Server token ", server.getToken(server.host, server.username, server.password));
```
I get the error that this function is not defined. My server file looks like the following:
```auto
const fetch = require('node-fetch');
const WebSocket = require('ws');
module.exports = function (RED) {
RED.nodes.registerType('sivideo-server', SiVideoServer, {});
function SiVideoServer(config) {
RED.nodes.createNode(this, config);
const node = this;
this.host = config.host;
this.username = config.username;
this.password = config.password;
const Listeners = {};
// Log the credentials for debugging purposes
console.log('Credentials:', this.host, this.username, this.password);
// Get the bearer token for websocket authentication
if (this.host && this.username && this.password) {
getToken(this.host, this.username, this.password)
.then((token) => {
node.context().set('token', token);
// If token obtained, create websocket connection
if (token && false) {
node.ws = new WebSocket(`ws://${this.host}/api/ws/events/v1`, {
headers: {
Authorization: `Bearer ${token}`,
},
});
console.log('Websocket connection created');
// Register message event listener
node.ws.on('message', (data) => {
for (const [id, cb] of Object.entries(Listeners)) {
cb(data);
}
});
} else {
console.log('No token obtained');
}
})
.catch((error) => {
console.error('Error fetching token:', error);
throw error;
});
} else {
console.log('No host, username, or password provided');
}
}
// get the token from the server
async function getToken(host, username, password) {
try {
const formData = new URLSearchParams();
formData.append('grant_type', 'password');
formData.append('client_id', 'GrantValidatorClient');
formData.append('username', username);
formData.append('password', password);
console.log('Form Data:', formData.toString());
const response = await fetch(`http://${host}/idp/connect/token`, {
method: 'POST',
headers: {
'Content-type': 'application/x-www-form-urlencoded',
},
body: formData,
});
if (response.ok) {
const data = await response.json();
console.log('Token:', data.access_token);
return data.access_token;
} else {
console.error('HTTP Error:', response.status);
return null;
}
} catch (error) {
console.error('Error fetching token:', error);
throw error;
}
}
// Register and deregister listeners
function registerListener(NodeID, Callback) {
console.log('Registering listener:', NodeID);
Listeners[NodeID] = Callback;
}
function deRegisterListener(NodeID) {
console.log('De-registering listener:', NodeID);
delete Listeners[NodeID];
}
};
```
---
### Author:  [@knolleary](https://discourse.nodered.org/u/knolleary)
#### Post date: [26 February 2024 14:07 UTC](https://discourse.nodered.org/t/cannot-call-functions-of-config-node/85929/2 "2024-02-26T14:07:50Z")
Hi @hansimeister
Your `getToken` function is not attached to your config node in any way that would allow other nodes to access it - its just a function in the same file as your node.
You could add the following to your `SiVideoServer` function to expose the function on your node object:
```auto
this.getToken = getToken
```
---
### Author:  [@hansimeister](https://discourse.nodered.org/u/hansimeister)
#### Post date: [26 February 2024 14:40 UTC](https://discourse.nodered.org/t/cannot-call-functions-of-config-node/85929/3 "2024-02-26T14:40:52Z")
Tried it like below but unfortunately I still get the same error? @knolleary
```auto
module.exports = function (RED) {
RED.nodes.registerType('sivideo-server', SiVideoServer, {});
function SiVideoServer(config) {
RED.nodes.createNode(this, config);
const node = this;
this.host = config.host;
this.username = config.username;
this.password = config.password;
this.getToken = getToken;
const Listeners = {};
```
---
### Author:  [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)
#### Post date: [26 February 2024 16:57 UTC](https://discourse.nodered.org/t/cannot-call-functions-of-config-node/85929/4 "2024-02-26T16:57:46Z")
I think it would help if you shared a slightly more complete view of the code.
Personally, I prefer to separate out the various functions so that the logic is a lot easier to follow. It tends to help you avoid these issues.
```javascript
let myconfig = {}
// This is run once when Node-RED Starts
module.exports = function myNode(RED) {
// In case you want to reference RED in other functions
myconfig.RED = RED
// ... any setup functions here ...
RED.nodes.registerType('myNode', nodeInstance)
})
// This is run once for each instance of the node in flows
function nodeInstance(config) {
// if you need to reference red
if ( !myconfig.RED ) return
const RED = myconfig.RED
// Initialise `this`
RED.nodes.createNode(this, config)
this.name = config.name
this.topic = config.topic
// ....
this.getToken = getToken
// Or, if you need to run it once for every instance:
// this.token = getToken(host, username, password)
// If you need to handle inbound msgs
this.on('input', inputMsgHandler)
// If you need to shut things down
this.on('close', (removed, done) => {
// ...
}
}
// If needed (NB: Inherits `this` from `nodeInstance`)
inputMsgHandler(msg, send, done) {
// if you need to reference red (quite likely in this fn)
if ( !myconfig.RED ) return
const RED = myconfig.RED
// ...
}
async function getToken(host, username, password) {
// ...
}
```
Then, if you want your getToken fn, you can simply add as another function at the end, reference `myconfig.RED` if you need to (which you indicate you don't here). And use it in any of the other functions as needed.
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [26 April 2024 16:57 UTC](https://discourse.nodered.org/t/cannot-call-functions-of-config-node/85929/5 "2024-04-26T16:57:57Z")
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