otlp-json
otpl-json is an OTLP serialisation library.
It's written in pure Python, without dependencies.
It serialises a bunch of spans into OTLP 1.5 JSON format.
Motivation
Tracing should be on by default.
OTLP is the standard data format and API, and the standard Python package is opentelemetry-exporter-otlp-proto-http. It brings in a total of 18 packages and adds 9MB to the project virtual environment.
A typical Python application, that's being instrumented, only generates own tracing data and needs to send it out. It doesn't need that much complexity.
Usage
from otlp_json import CONTENT_TYPE, encode_spans
class SomeExporter:
def export(self.spans: Sequece[ReadableSpan]) -> None:
requests.post(
"http://localhost:4318/v1/traces",
data=encode_spans(spans),
headers={"Content-Type": CONTENT_TYPE},
)
Library size
- 3KB whl, containing:
- 4KB Python source
- ?? metadata
Testing
uv sync
uv run pytest
Links
- Test data generator: https://pypi.org/project/otlp-test-data/
- Python stdlib-only exporter: https://github.com/canonical/operator/blob/main/tracing/ops_tracing/_export.py#L141-L160
- Tiny (compiled) extension written in Rust: https://pypi.org/project/otlp-proto
Features
- Events
- Links
- Baggage
- Schemata, when https://github.com/open-telemetry/opentelemetry-python/pull/4359 lands
TODO(fixes)
- Status fields
- validate what fields are in fact optional
- ???
Limitations
This library is meant to marshal tracing data that's collected in the same Python process.
It is not meant to be used for data received and forwarded.
3 maintainers
Metadata
3 maintainers
Release files for otlp-json 1.0.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| otlp_json-1.0.1.tar.gz | 47.0 kB | With provenance | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| otlp_json-1.0.1-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 51.4 kB
Release files / otlp_json-1.0.1.tar.gz
| Download URL | otlp_json-1.0.1.tar.gz |
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| Size | 47.0 kB |
| Tags | Source |
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| Download URL | otlp_json-1.0.1-py3-none-any.whl |
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| Size | 4.4 kB |
| Tags | Python 3 |
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Attestation for otlp_json-1.0.1.tar.gz
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Signed by GitHub Actions, verified by PyPI on Feb 5, 2026.
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