# @opentelemetry/otlp-transformer

> Transform OpenTelemetry SDK data into OTLP

Latest version **0.222.0** (published 2026-08-31) · Apache-2.0 license · 0 weekly downloads

## Install

```sh
npm install @opentelemetry/otlp-transformer
pnpm add @opentelemetry/otlp-transformer
yarn add @opentelemetry/otlp-transformer
bun add @opentelemetry/otlp-transformer
```

## Health

**Score 75/100 (B)** — status: active.

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

Warnings: low downloads; pre 1.0.

## Facts

| | |
|---|---|
| Version | 0.222.0 |
| Published | 2026-08-31 |
| First published | 2022-05-27 |
| Weekly downloads | 0 |
| License | Apache-2.0 |
| TypeScript types | bundled |
| Module format | ESM + CommonJS |
| Node | ^18.19.0 \|\| >=20.6.0 |
| Dependencies | 6 |
| Unpacked size | 1 MB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Provenance | attested (GitHub Actions) |
| GitHub stars | 3476 |
| Author | OpenTelemetry Authors |
| Maintainers | dyladan, pichlermarc, overbalance, npmjs-account, trentm, martinkuba |
| Keywords | opentelemetry, nodejs, grpc, protobuf, otlp, tracing, metrics |

## Links

- npm: https://www.npmjs.com/package/@opentelemetry/otlp-transformer
- Repository: https://github.com/open-telemetry/opentelemetry-js
- Homepage: https://github.com/open-telemetry/opentelemetry-js/tree/main/experimental/packages/otlp-transformer
- Issues: https://github.com/open-telemetry/opentelemetry-js/issues
- npm.io page: https://npm.io/package/@opentelemetry/otlp-transformer

## Dependencies (6)

- [@opentelemetry/core](https://npm.io/package/@opentelemetry/core.md) 2.11.0
- [@opentelemetry/api-logs](https://npm.io/package/@opentelemetry/api-logs.md) 0.222.0
- [@opentelemetry/sdk-logs](https://npm.io/package/@opentelemetry/sdk-logs.md) 0.222.0
- [@opentelemetry/resources](https://npm.io/package/@opentelemetry/resources.md) 2.11.0
- [@opentelemetry/sdk-trace](https://npm.io/package/@opentelemetry/sdk-trace.md) 2.11.0
- [@opentelemetry/sdk-metrics](https://npm.io/package/@opentelemetry/sdk-metrics.md) 2.11.0

## Recent versions

- 0.222.0 (latest) — 2026-08-31
- 0.300.0-development.0 (canary) — 2026-09-21
- 0.34.0 (next) — 2022-11-09
- 0.222.0-development.0 — 2026-08-31
- 0.221.0 — 2026-07-21
- 0.220.0 — 2026-07-02
- 0.219.0 — 2026-06-11
- 0.218.0 — 2026-05-13
- 0.217.0 — 2026-05-06
- 0.216.0 — 2026-04-29
- 0.215.0 — 2026-04-17
- 0.214.0 — 2026-03-25
- 0.213.0 — 2026-03-03
- 0.212.0 — 2026-02-12
- 0.211.0 — 2026-01-21
- … 58 more at https://npm.io/package/@opentelemetry/otlp-transformer/versions

## README

# OpenTelemetry Protocol

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

**Note: This package is intended for internal use only.**

**Note: This is an experimental package under active development. New releases may include breaking changes.**

This package provides everything needed to serialize [OpenTelemetry SDK][sdk] traces, metrics and logs into the [OpenTelemetry Protocol][otlp] format.

## Quick Start

To get started you will need to install a compatible OpenTelemetry API.

### Install Peer Dependencies

```sh
npm install @opentelemetry/api
```

### Serialize Traces/Metrics/Logs

This module exports serializers to serialize traces, metrics and logs from the OpenTelemetry SDK into protocol buffers
or JSON which can be sent over HTTP or gRPC (protobuf-only) to the OpenTelemetry collector or a compatible receiver.

```typescript
import {
  JsonLogsSerializer,
  JsonMetricsSerializer,
  JsonTraceSerializer,
  ProtobufLogsSerializer,
  ProtobufMetricsSerializer,
  ProtobufTraceSerializer,
  IExportLogsServiceResponse,
  IExportMetricsServiceResponse,
  IExportTraceServiceResponse,
} from '@opentelemetry/otlp-transformer';

// serialize to JSON export requests
const serializedJsonLogs: Uint8Array = JsonLogsSerializer.serializeRequest(readableLogRecords);
const serializedJsonMetrics: Uint8Array = JsonMetricsSerializer.serializeRequest(resourceMetrics);
const serializedJsonTraces: Uint8Array = JsonTraceSerializer.serializeRequest(readableSpans);

// serialize to Protobuf export requests
const serializedProtobufLogs: Uint8Array = ProtobufLogsSerializer.serializeRequest(readableLogRecords);
const serializedProtobufMetrics: Uint8Array = ProtobufMetricsSerializer.serializeRequest(resourceMetrics);
const serializedProtobufTraces: Uint8Array = ProtobufTraceSerializer.serializeRequest(readableSpans);

// deserialize JSON export responses
const deserializedJsonLogResponse: IExportLogsServiceResponse = JsonLogsSerializer.deserializeResponse(jsonLogResponse);
const deserializedJsonMetricsResponse: IExportMetricsServiceResponse = JsonMetricsSerializer.deserializeResponse(jsonMetricsResponse);
const deserializedJsonTraceResponse: IExportTraceServiceResponse = JsonTraceSerializer.deserializeResponse(jsonTraceResponse);

// deserialize Protobuf export responses
const deserializedProtobufLogResponse: IExportLogsServiceResponse = ProtobufLogsSerializer.deserializeResponse(protobufLogResponse);
const deserializedProtobufMetricsResponse: IExportMetricsServiceResponse = ProtobufMetricsSerializer.deserializeResponse(protobufMetricsResponse);
const deserializedProtobufTraceResponse: IExportTraceServiceResponse = ProtobufTraceSerializer.deserializeResponse(protobufTraceResponse);
```

## 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/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/otlp-transformer
[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Fotlp-transformer.svg

[sdk]: https://github.com/open-telemetry/opentelemetry-js
[otlp]: https://github.com/open-telemetry/opentelemetry-proto

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