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How to get decoded events by transaction hash

Prerequisites​

Before getting started, make sure you have the following ready:

  • Node v.14+
  • NPM

Step 1: Setup Blocklens​

First register your Blocklens account and get your Blocklens API Key.

Once you have your Blocklens API Key, install the Blocklens SDK in your project.

npm i blocklens-sdk

Step 2: Get decoded events by transaction hash​

In order to get decoded events by transaction hash, Blocklens provides you a getDecodedEventsByTransactionHash endpoint to do so.

Here you'll need a parameter: transaction_hash.

Once you've obtained the transaction_hash, you can copy the following code:

import Blocklens from "blocklens-sdk";

const blocklens = new Blocklens();
blocklens.init({ apiKey: "YOUR_API_KEY" });

const runApis = async () => {
  const response = await blocklens.ETH_MAINNET.getDecodedEventsByTransactionHash("0x12259c8b5a0f51320bb1b64dfb2b1b61e24aaa127318b0cf92d209525f0d5447");
  console.log(response);
};

runApis();

Step 3: Run the script​

ts-node index.ts

In your terminal, you should see the following JSON response with the data: In your terminal, you should see the following JSON response with the data blocks:

{
  "page": 1,
  "limit": 20,
  "cursor": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjB4MDAwMTZkNzU3MDk5MTM4NTdhYmE0ZmE2ZTdiYThmNTRjNDRmMjUzZDk5YWNhMjYwMzdkODk0ODA4YTc4YTEyYV83ODciLCJwYWdlIjoxLCJ0cmFuc2FjdGlvbkhhc2giOiIweDAwMDE2ZDc1NzA5OTEzODU3YWJhNGZhNmU3YmE4ZjU0YzQ0ZjI1M2Q5OWFjYTI2MDM3ZDg5NDgwOGE3OGExMmEiLCJpYXQiOjE2OTcwODg2NTZ9.6ebWzlmBoBbUv1kRej6bTZkSHYQGy_6o05p90eM-iqM",
  "total_items": 5,
  "data": [
    {
      "tx_hash": "0x00016d75709913857aba4fa6e7ba8f54c44f253d99aca26037d894808a78a12a",
      "contract_address": "0x201F7DD733443b8fe236656DD860Da728db15364",
      "block_number": 18222474,
      "timestamp": 1695761843,
      "block_time": "2023-09-26 20:57:23",
      "signature": "Swap(address,uint256,uint256,uint256,uint256,address)",
      "index": 791,
      "data_decoded": "[\"0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D\",{\"type\":\"BigNumber\",\"hex\":\"0x4f4419612ace7d\"},{\"type\":\"BigNumber\",\"hex\":\"0x00\"},{\"type\":\"BigNumber\",\"hex\":\"0x00\"},{\"type\":\"BigNumber\",\"hex\":\"0x0905ae138000\"},\"0xeb847066720351392957E18eC1bd5fB17868B280\"]",
      "event_name": "Swap"
    }
  ]
}

Congratulations 🥳 you just found the get decoded events by transaction hash on multiple chains with only a few lines of code using the Blocklens Wallet API!

API Reference​

If you want to know more details on the endpoint and optional parameters, check out:

Support​

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