# Dynamic function call - eval alternative
**URL:** https://discourse.nodered.org/t/dynamic-function-call-eval-alternative/55492
**Category:** General
**Created:** [20 December 2021 17:12 UTC](https://discourse.nodered.org/t/dynamic-function-call-eval-alternative/55492 "2021-12-20T17:12:39Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@bakman2](https://discourse.nodered.org/u/bakman2)
#### Post date: [20 December 2021 17:12 UTC](https://discourse.nodered.org/t/dynamic-function-call-eval-alternative/55492/1 "2021-12-20T17:12:39Z")
Lets say i have function node that implements various api functions and I want to dynamically call those functions based on a msg property. In the browser one would call the `windows[fn]` but that is not available in nodejs, eval is possible, but generally not recommended. Is there better way (other than doing if/else if)?
```auto
function start(id){...}
function stop(id){...}
let fn = msg.payload.fn // start
let id = msg.payload.id
eval(`${fn}(${id})`);
```
---
### Author:  [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)
#### Post date: [20 December 2021 17:15 UTC](https://discourse.nodered.org/t/dynamic-function-call-eval-alternative/55492/2 "2021-12-20T17:15:56Z")
Put the code into an externnal module file and load it into the global vars in your settings.js
Then you can refernce it in a function node simply by doing a global.get.
---
### Author:  [@knolleary](https://discourse.nodered.org/u/knolleary)
#### Post date: [20 December 2021 17:16 UTC](https://discourse.nodered.org/t/dynamic-function-call-eval-alternative/55492/3 "2021-12-20T17:16:09Z")
Define your functions as properties of an object so you can reference them. (Which is what the window object basically is in the browser).
```auto
const myFuncs = {
start: function(id) { ... },
stop: function(id) { ... }
}
let fn = msg.payload.fn // start
let id = msg.payload.id
myFuncs[fn](id)
```
---
### Author:  [@bakman2](https://discourse.nodered.org/u/bakman2)
#### Post date: [20 December 2021 17:18 UTC](https://discourse.nodered.org/t/dynamic-function-call-eval-alternative/55492/4 "2021-12-20T17:18:48Z")
Ah yeah ofcourse, the penny has dropped thanks, makes perfect sense.
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [3 January 2022 17:19 UTC](https://discourse.nodered.org/t/dynamic-function-call-eval-alternative/55492/5 "2022-01-03T17:19:46Z")
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