Node.js TypeError: Cannot read property '1' of undefined

Question

index.js

const o = require('./altoken')

    for(const i=1; i<99; i++){
        
        if(o.opts[i].identity.username === null){break;}; //error here
        
        message.guild.channels.create(o.opts[i].identity.username, {type: "text",parent: id})
    }

altoken.js

 module.exports.opts1 = {
  mro: {
    as: false,
  },
  identity: {
    username: "x",
    password: "x"
  },
  krlo: [
    'x',
  ]
};

I want to create as many channels as modules in altoken.js but I am getting an error. TypeError: Cannot read property '1' of undefined

`module.exports` doesn't contain a property `opts`. `o.opts` returns `undefined`. `o.opts[1]` is an error. — jabaa, May 01 '22 at 10:52
o.opts1.identity.username, o.opts2.identity.username, o.opts3.identity.username how can i use — warmesty, May 01 '22 at 11:01
This is also useful: [JavaScript property access: dot notation vs. brackets?](https://stackoverflow.com/questions/4968406/javascript-property-access-dot-notation-vs-brackets) — jabaa, May 01 '22 at 11:09

jabaa · Accepted Answer · 2022-05-01T11:29:28.880

1

You want to access a property by dynamic property name. You need bracket notation:

o['opts' + i]

Example:

const o = require('./altoken')

for(const i=1; i<99; i++){
    
    if(o['opts' + i].identity.username === null){break;}; //error here
    
    message.guild.channels.create(o['opts' + i].identity.username, {type: "text",parent: id})
}

edited May 01 '22 at 11:29

answered May 01 '22 at 11:18

jabaa

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Node.js TypeError: Cannot read property '1' of undefined

1 Answers1