python-lsp-jsonrpc
JSON RPC 2.0 server library
Decision gist · record as of 2026-08-14
Yes, if you need a JSON RPC 2.0 server implementation. The package is stable, permissively licensed, and has low install friction. However, note that maintenance is aging (last release 2023-09-23 with no recent commits), so expect no active development or rapid bug fixes. Suitable for production use in stable, low-change scenarios; less suitable if you need ongoing support or active feature development.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or later; transport layer (stdin/stdout, sockets, websockets) must be provided by the caller.
- Low install friction with a single lightweight dependency (ujson).
- Maintenance status is aging—last release was 2023-09-23 and the repository shows no recent commits, though it remains unarchived and stable.
License · maintenance · safety
MIT (permissive) — MIT license permits unrestricted use, modification, and distribution in both open and proprietary projects with minimal obligations.
last release 2023-09-23 (1056 days) · last repo commit 2025-07-16 · 28 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 1,823,353 downloads/mo, #3,516 on PyPI
Alternatives
Verify before relying
pip install python-lsp-jsonrpc
from python_lsp_jsonrpc import JSONRPC2Connection, ReadWriter
import sys
reader_writer = ReadWriter(sys.stdin.buffer, sys.stdout.buffer)
conn = JSONRPC2Connection(reader_writer)
conn.start()- Whether the package is actively maintained or in maintenance-only mode despite the aging status
- Performance characteristics when handling high-volume RPC calls or large payloads
What it is and what it does
python-lsp-jsonrpc is a server-side implementation of the JSON RPC 2.0 specification extracted from the Python LSP Server project. It handles the protocol mechanics—parsing requests, dispatching to handlers, and sending responses—but does not provide the transport layer itself; you supply that via stdin/stdout, sockets, websockets, or any other I/O mechanism.
The package is typically used as a foundation for building language servers, editor integrations, or other RPC-based services in Python. It depends only on ujson for fast JSON parsing and is designed to be lightweight and composable with existing transport frameworks like tornado or asyncio.
Use it for
- Building language server implementations that communicate with editors over JSON RPC 2.0
- Creating RPC-based microservices or inter-process communication layers in Python
- Wrapping existing Python tools to expose them via the JSON RPC 2.0 protocol over websockets or stdio
- Handling bidirectional request-response and notification patterns in editor plugins or IDE extensions
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need a JSON RPC 2.0 server implementation.
The package is stable, permissively licensed, and has low install friction. However, note that maintenance is aging (last release 2023-09-23 with no recent commits), so expect no active development or rapid bug fixes. Suitable for production use in stable, low-change scenarios; less suitable if you need ongoing support or active feature development.
Install
python-lsp-jsonrpc on PyPI
Before you install
Low install friction with a single lightweight dependency (ujson). Maintenance status is aging—last release was 2023-09-23 and the repository shows no recent commits, though it remains unarchived and stable.
Requires Python 3.8 or later; transport layer (stdin/stdout, sockets, websockets) must be provided by the caller.
License in practice
MIT license permits unrestricted use, modification, and distribution in both open and proprietary projects with minimal obligations.
Quickstart
pip install python-lsp-jsonrpc
from python_lsp_jsonrpc import JSONRPC2Connection, ReadWriter
import sys
reader_writer = ReadWriter(sys.stdin.buffer, sys.stdout.buffer)
conn = JSONRPC2Connection(reader_writer)
conn.start()Verify before relying
- Whether the package is actively maintained or in maintenance-only mode despite the aging status
- Performance characteristics when handling high-volume RPC calls or large payloads
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.8 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageujson |
| Maintenance | Aging 1,056 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 1,823,353 / month, #3,516 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: MIT License |
Evidence: python_lsp_jsonrpc-1.1.2-py3-none-any.whl
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See also python-jsonrpc-server · json-rpc · ajsonrpc · python-lsp-server · python-bitcoinrpc · jsonrpcclient · python-lsp-ruff · jupyterlab-lsp · OdooRPC · pylsp-mypy