Event logging using Moralis.io.

Moralis blockchain query SDK supports real time contract syncronization with various networks including; Ethereum, Polygon, Binance, Avalanche, Arbitrum and their corresponding testnets.


Tracking CreatedEdition contract event on Rinkeby testnet.

Example event function

Our solidity event function we are logging:

  event CreatedEdition(
        uint256 indexed editionId,
        address indexed creator,
        uint256 editionSize,
        address editionContractAddress


https://moralis.io Account required!

Login to Moralis.io

  1. Create Ethereum Rinkeby testnet server.
  2. Click ‘View details’ button next to your server. *Note Application + Serer URL.*
  3. Go to ‘sync’ tab and click ‘Add New Sync’ button

Sync Config

  1. Select Blockchain (Rinkeby)
  2. Enter random description.
  3. Check ‘Sync Historical” box if you want past events logged.
  4. Under ‘Topic’ add your event function. Our event topic used in Moralis config:
CreatedEdition( uint256, address , uint256 , address)
  1. Next, Add only the ABI code of your contract event. Event ABI code for CreatedEdition event:

  "anonymous": false,
  "inputs": [
      "indexed": true,
      "internalType": "uint256",
      "name": "editionId",
      "type": "uint256"
      "indexed": true,
      "internalType": "address",
      "name": "creator",
      "type": "address"
      "indexed": false,
      "internalType": "uint256",
      "name": "editionSize",
      "type": "uint256"
      "indexed": false,
      "internalType": "address",
      "name": "editionContractAddress",
      "type": "address"
  "name": "CreatedEdition",
  "type": "event"
  1. Then enter your deployed contract address. Our Rinkeby contract address for reference:
  1. Next, add your table name. This name is used to identify your data within the Moralis database and your react app. We used the name of our contract ‘dFactory’. *Note table name for later*

  2. Click Confirm

  3. Click the ‘Dashboard’ button next to your running server and your ‘Table Name’ should be listed on the left under the ‘Browser’ tab.

Once your Moralis server is running and configured we can begin installing our web app. 10. Clone MoralisContractSync github repo.

git clone https://github.com/fourswordsio/MoralisContractSync
  1. Install dependencies.*I received a missing peer dependencies error when I ran this so I included in the command below.*

cd MoralisContractSync
npm install --legacy-peer-deps
  1. Open the index.js file and add your Moralis ‘Application ID’ and ‘Server_url’. Save.

const moralisAppId = "enter Application ID here";
const moralisServerURL = "enter server URL here";
  1. Open the App.js file and add the event table column names you wish to display.

<Td>{element.get("editionContractAddress")}</Td> <Td>{element.get("creator")}</Td> <Td>{element.get("creator")}</Td>; <Td>{element.get("editionSize")}</Td>; <Td>{element.get("editionId")}</Td> save file. _ 14. Start Application.

npm start

*You may need to whitelist your IP address or deploy via proxy to display on localhost due to Moralis CORS browser security errors.


View Github