# @metamask/eth-json-rpc-filters

> [json-rpc-engine](https://github.com/MetaMask/json-rpc-engine) middleware implementing ethereum filter methods. Backed by an [eth-block-tracker](https://github.com/MetaMask/eth-block-tracker) and web3 provider interface (`web3.currentProvider`).

Latest version **9.0.0** (published 2024-10-18) · ISC license · 0 weekly downloads

## Install

```sh
npm install @metamask/eth-json-rpc-filters
pnpm add @metamask/eth-json-rpc-filters
yarn add @metamask/eth-json-rpc-filters
bun add @metamask/eth-json-rpc-filters
```

## Health

**Score 40/100 (D)** — status: stable.

Positive: no vulnerabilities; high maintenance score.

Warnings: low downloads; no types; no esm support.

Negative: stale.

## Facts

| | |
|---|---|
| Version | 9.0.0 |
| Published | 2024-10-18 |
| First published | 2023-10-12 |
| Weekly downloads | 0 |
| License | ISC |
| TypeScript types | none |
| Module format | CommonJS |
| Node | ^18.16 \|\| ^20 \|\| >=22 |
| Dependencies | 5 |
| Unpacked size | 23.6 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 29 |
| Maintainers | mcmire, nicholasellul, lgbot, naugtur, ritave, danfinlay, kumavis, rekmarks, metamaskbot, gudahtt, sethkfman |

## Links

- npm: https://www.npmjs.com/package/@metamask/eth-json-rpc-filters
- Repository: https://github.com/MetaMask/eth-json-rpc-filters
- Homepage: https://github.com/MetaMask/eth-json-rpc-filters#readme
- Issues: https://github.com/MetaMask/eth-json-rpc-filters/issues
- npm.io page: https://npm.io/package/@metamask/eth-json-rpc-filters

## Dependencies (5)

- [pify](https://npm.io/package/pify.md) ^5.0.0
- [async-mutex](https://npm.io/package/async-mutex.md) ^0.5.0
- [@metamask/eth-query](https://npm.io/package/@metamask/eth-query.md) ^4.0.0
- [@metamask/json-rpc-engine](https://npm.io/package/@metamask/json-rpc-engine.md) ^10.0.0
- [@metamask/safe-event-emitter](https://npm.io/package/@metamask/safe-event-emitter.md) ^3.0.0

## Recent versions

- 9.0.0 (latest) — 2024-10-18
- 8.0.0 — 2024-07-23
- 7.0.1 — 2024-07-16
- 7.0.0 — 2023-10-12

## README

# `@metamask/eth-json-rpc-filters`

[json-rpc-engine](https://github.com/MetaMask/json-rpc-engine) middleware implementing Ethereum filter methods.
Backed by an [eth-block-tracker](https://github.com/MetaMask/eth-block-tracker) and web3 provider interface (`web3.currentProvider`).

### supported rpc methods
- `eth_newFilter`
- `eth_newBlockFilter`
- `eth_newPendingTransactionFilter`
- `eth_uninstallFilter`
- `eth_getFilterChanges`
- `eth_getFilterLogs`

### usage

basic usage:
```js
const filterMiddleware = createFilterMiddleware({ blockTracker, provider })
engine.push(filterMiddleware)
```

cleanup:
```js
// remove blockTracker handler to free middleware for garbage collection
filterMiddleware.destroy()
```

## Running Tests

```bash
yarn test
```

## Changelog
[`CHANGELOG.md`](./CHANGELOG.md)

---
_Source: https://npm.io/package/@metamask/eth-json-rpc-filters · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._