# @opentelemetry/instrumentation-lru-memoizer

> OpenTelemetry instrumentation for `lru-memoizer` function memoization using lru-cache

Latest version **0.66.0** (published 2026-08-31) · Apache-2.0 license · 0 weekly downloads

## Install

```sh
npm install @opentelemetry/instrumentation-lru-memoizer
pnpm add @opentelemetry/instrumentation-lru-memoizer
yarn add @opentelemetry/instrumentation-lru-memoizer
bun add @opentelemetry/instrumentation-lru-memoizer
```

## Health

**Score 70/100 (B)** — status: active.

Positive: has types; no vulnerabilities; has provenance; recently updated; high maintenance score; high quality score.

Warnings: low downloads; no esm support; pre 1.0.

## Facts

| | |
|---|---|
| Version | 0.66.0 |
| Published | 2026-08-31 |
| First published | 2022-08-08 |
| Weekly downloads | 0 |
| License | Apache-2.0 |
| TypeScript types | bundled |
| Module format | CommonJS |
| Node | ^18.19.0 \|\| >=20.6.0 |
| Dependencies | 1 |
| Unpacked size | 23.4 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Provenance | attested (GitHub Actions) |
| GitHub stars | 927 |
| Author | OpenTelemetry Authors |
| Maintainers | dyladan, pichlermarc, overbalance, npmjs-account, trentm, martinkuba |
| Keywords | lru-memoizer, instrumentation, nodejs, opentelemetry, tracing |

## Links

- npm: https://www.npmjs.com/package/@opentelemetry/instrumentation-lru-memoizer
- Repository: https://github.com/open-telemetry/opentelemetry-js-contrib
- Homepage: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/main/packages/instrumentation-lru-memoizer#readme
- Issues: https://github.com/open-telemetry/opentelemetry-js-contrib/issues
- npm.io page: https://npm.io/package/@opentelemetry/instrumentation-lru-memoizer

## Dependencies (1)

- [@opentelemetry/instrumentation](https://npm.io/package/@opentelemetry/instrumentation.md) ^0.222.0

## Recent versions

- 0.66.0 (latest) — 2026-08-31
- 0.65.0 — 2026-07-23
- 0.64.0 — 2026-07-03
- 0.63.0 — 2026-06-11
- 0.62.0 — 2026-05-13
- 0.61.0 — 2026-05-06
- 0.60.0 — 2026-04-29
- 0.59.0 — 2026-04-17
- 0.58.0 — 2026-03-26
- 0.57.0 — 2026-03-04
- 0.56.0 — 2026-02-17
- 0.55.0 — 2026-01-22
- 0.54.0 — 2026-01-15
- 0.53.1 — 2025-12-17
- 0.53.0 — 2025-11-06
- … 36 more at https://npm.io/package/@opentelemetry/instrumentation-lru-memoizer/versions

## README

# OpenTelemetry lru-memoizer Instrumentation for Node.js

[![NPM Published Version][npm-img]][npm-url]
[![Apache License][license-image]][license-image]

This module provides automatic instrumentation for the [`lru-memoizer`](https://github.com/jfromaniello/lru-memoizer) module.

If total installation size is not constrained, it is recommended to use the [`@opentelemetry/auto-instrumentations-node`](https://www.npmjs.com/package/@opentelemetry/auto-instrumentations-node) bundle with [@opentelemetry/sdk-node](https://www.npmjs.com/package/@opentelemetry/sdk-node) for the most seamless instrumentation experience.

Compatible with OpenTelemetry JS API and SDK `1.0+`.

## Installation

```bash
npm install --save @opentelemetry/instrumentation-lru-memoizer
```

## Supported Versions

- [`lru-memoizer`](https://www.npmjs.com/package/lru-memoizer) versions `>=1.3.0 <4`

## Usage

This instrumentation does not produce any telemetry data. It only bind the caller context to callbacks so downstream operations are recorded with the right context (traceId / parentSpanId / baggage / etc). The `lru-memoizer` package is a dependency for other packages such as [jwks-rsa](https://www.npmjs.com/package/jwks-rsa)

To enable a specific instrumentation, pass it to `registerInstrumentations()`.
This is commonly done via `NodeSDK` for fully setting up all OpenTelemetry SDK components:

```js
const { NodeSDK } = require('@opentelemetry/sdk-node');
const { LruMemoizerInstrumentation } = require('@opentelemetry/instrumentation-lru-memoizer');

const sdk = new NodeSDK({
  instrumentations: [
    new LruMemoizerInstrumentation(),
  ],
});
sdk.start();
process.once('beforeExit', async () => { await sdk.shutdown(); });
```

## Semantic Conventions

This package does not currently generate any attributes from semantic conventions.

## Useful links

- For more information on OpenTelemetry, visit: <https://opentelemetry.io/>
- For more about OpenTelemetry JavaScript: <https://github.com/open-telemetry/opentelemetry-js>
- For help or feedback on this project, join us in [GitHub Discussions][discussions-url]

## License

Apache 2.0 - See [LICENSE][license-url] for more information.

[discussions-url]: https://github.com/open-telemetry/opentelemetry-js/discussions
[license-url]: https://github.com/open-telemetry/opentelemetry-js-contrib/blob/main/LICENSE
[license-image]: https://img.shields.io/badge/license-Apache_2.0-green.svg?style=flat
[npm-url]: https://www.npmjs.com/package/@opentelemetry/instrumentation-lru-memoizer
[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Finstrumentation-lru-memoizer.svg

---
_Source: https://npm.io/package/@opentelemetry/instrumentation-lru-memoizer · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._