# Indexer

See [BlocksTxIndexer](https://github.com/0xweb-org/dequanto/blob/master/src/indexer/BlocksTxIndexer.ts)🔗 for details.

With the indexer, you can go through a range of blocks and handle the transactions.

A range can be specified by block numbers or dates. The Indexer can also listen for incoming block headers and transactions.

```typescript
import { BlocksTxIndexer } from '@dequanto/indexer/BlocksTxIndexer'

let indexer = new BlocksTxIndexer(platform, {
    name: 'foo worker',
    // loads also transactions from the mined blocks
    loadTransactions: true,
    // saves blockNumbers of already processed blocks
    persistance: true,
});

indexer.onBlock(async (
    client: Web3Client, 
    block: BlockTransactionString, 
    txs: Transaction[]
) => {
    // process txs
});

// starts indexing from the block at specified date
// as no end date is provided, after indexer is ready, it will listen for incomming blocks
indexer.start(new Date('2022-04-22T00:00:00Z'));

// gets current status 
let status = indexer.stats();

```


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