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Harper Language Server

Harper is an offline, privacy-first English grammar checker designed for developers, delivering fast grammar and language suggestions locally. The harper-ls is the Language Server Protocol frontend for Harper, supporting comment parsing and integration with developer tools.
Latest: 2.1.0
Last checked: Mar 16, 2026 6:45pm
Rank: 231/15140
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Overview

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License: Apache-2.0Winget: Available

Version & Lifecycle

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Current: 2.1.0 N-2: 1.12.0 Avg cadence: Every 5 days

Top Contributors

Top sitewide contributors:

  1. Anbarasan
  2. nico_k
  3. Bob
  4. Vigneshwaran

Community Notes

Deployment note • May 9, 2026
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Deployment tip

Harper-ls Windows Deployment Tip: Download the pre-built harper-ls binary from the official GitHub releases at github.com/Automattic/harper/tree/master/harper-ls (under Windows assets), then deploy it silently via script to %LOCALAPPDATA%harper-ls—the default data directory—and add this path to the system %PATH% environment variable using setx /M PATH "%PATH%;%LOCALAPPDATA%harper-ls" for enterprise-wide LSP access in editors like VS Code or Neovim. Configure via LSP settings (e.g., userDictPath="%LOCALAPPDATA%harper-lsuser_dict.txt") or environment variables like HARPER_LS_USER_DICT_PATH for custom dictionaries at scale.

Release Notes & Updates

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Avg cadence:
Updates • 0

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Also known as

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harper-lsHarper Language Server

Packaging Notes

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Rust-powered, open-source, privacy-first grammar checker with Language Server Protocol frontend

Notes

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Acquired by Automattic in 2024; open source with Apache-2.0 license; latest release v0.54.0 as of July 2025