"TypeError: Cannot read property 'startsWith' of undefined"

General
1

I have a funtion node with many functions in it. On one function I get the following error message: "TypeError: Cannot read property 'startsWith' of undefined"

What causes this message. Any help appreciated

2

it means you are calling startsWith(...) on a variable that is undefined somewhere in your function.

use node.warn(my_var) in your function to check a value of a variable before you call startsWith

3

I am not calling startsWith(...) ....
here my function code:

function runtime_stop(){
    //let end = Date.now();
    let runtime = Date.now() - context.get(starttime);
    msg.topic = "runtime";
    msg.payload = runtime;
    node.send(msg);

    msg.topic = "runtimestr";
    msg.payload = runtime_str(runtime);
    node-send(msg);
    
    let total = context.get(runtimetotal) + runtime;
    context.set("runtimetotal", total);
    msg.topic = "runtimetotal";
    msg.payload = total;
    node.send(msg);
    
    return;
}
4

It could be coming from a sub function like context.get

Put a node.warn call above the context.get and check what value is in starttime and runtimetotal

PS, I assume that's not the full code since there is no call to your function. Have you checked all of the function code?

5

problem solved.
I forgot the " in context.get :frowning:

many thanks for your help.
node warn helped!

6

So it looks like passing in undefined as the first argument to context.get causes that error. We ought to handle that case and either return undefined or throw a more descriptive error.

If anyone fancies a PR'ing a fix, it'll be around here: node-red/index.js at master · node-red/node-red · GitHub

7

I dont mind pickling that up Nick. Against master or dev?

PS: this should become less of a pain point when users (hopefully) switch to using monaco in v2.0.0 :slight_smile:)

image
image708×221 16.6 KB

8

master please - and have a look at set as well just in case :slight_smile:

9

done.

10

I'm also with that error...nothing is working for me. What could it be?

const Discord = require("discord.js")
const fs = require("fs")
var env = {}
fs.stat("./env.json", (err, stats) => { if (!err) env = require("./env.json") })

const firebase = require("firebase-admin")
const firebaseApp = firebase.initializeApp({
    credential: firebase.credential.cert((process.env.FIREBASECERT || JSON.stringify(env.FIREBASECERT)) .startsWith("{") ? JSON.parse(process.env.FIREBASECERT || JSON.stringify(env.FIREBASECERT)) : JSON.parse(fs.readFileSync(process.env.FIREBASECERT))),
    databaseURL: "https://kale-bot-discord-default-rtdb.firebaseio.com"
})

.startsWith("{")

11

This issue was due to context. You problem has nothing to do with context (you arent using context)

If you are getting TypeError: Cannot read property ‘startsWith’ of undefined it will be because (process.env.FIREBASECERT || JSON.stringify(env.FIREBASECERT)) returns null, undefined or is NOT a string.

Please open a new thread if you still have this issue.