Best way to create a Moralis Singleton Instance?

#1

I want to have one file that contains the Moralis.start() method so I don’t need to duplicate code across handlers.

Here’s my current code:

let moralisInstance: typeof Moralis;

export const getMoralisInstance = (
  config?: Partial<MoralisConfigValues>
): typeof Moralis => {
  if (!moralisInstance) {
    Moralis.start({
      apiKey: process.env.NEXT_PUBLIC_MORALIS_API_KEY,
      ...config,
    });

    moralisInstance = Moralis;
  }
  return moralisInstance;
};

This works but I will occasionally get a Moralis error stating that the module has already been started.

error - unhandledRejection: MoralisError [Moralis SDK Error]: [C0009] Modules are started already. This method should be called only one time.

Any better ideas?

#2

This is server side? You have to initialize it more than once server side?

#3

Client side. I am using it with Redux Thunk middleware. I have multiple thunk files that call the Moralis SDK and don’t want to have to use Moralis.start() at the beginning of each file. Instead I just call this:

const moralisInstance = getMoralisInstance();

Maybe I am totally off-base here. Any advice on how to handle this situation is appreciated.

#4

Can you try replacing this with.

if (!Moralis.Core.isStarted)

If that works for you, then you can add this if condition at every Moralis.start.

Checking if Moralis Modules are already started
#5

Late to the conversation, but it seems that in my case, inserting default is required. For example Moralis.default.Core.isStarted. What am I doing wrong? :crazy_face:

#7

how did you import moralis? you can do
const Moralis = require("moralis").default
to avoid this

#8

import Moralis from 'moralis'

#9

I think this is something related to the compiler version. If you use ts compiler then using default is not required. But on the babel compiler, you need default.

1 Like
#10

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