JSONL LSP

JSONL LSP for Zed

Language-server support for JSON Lines (.jsonl) and NDJSON (.ndjson) in Zed: per-record diagnostics as you type, document and range formatting, record-oriented document outlines, hover-based record inspection (pretty-printed JSON in a popup), and expand/compact code actions.

This extension runs jsonl-lsp. If a jsonl-lsp executable is available on the worktree's PATH, the extension uses it directly. Otherwise, it installs @sarvagnan/jsonl-lsp with Zed's npm/Node.js support on first use and keeps the package current.

Requirements

The JSONL extension must be installed — it provides the "JSON Lines" language (grammar, highlighting, and file associations) that this server attaches to. Zed will suggest it automatically when you open a .jsonl file.

Install as a development extension

1. Open Zed's Extensions view.
2. Select Install Dev Extension.
3. Choose this editors/zed directory.

You can also run zed: install dev extension from the command palette and select the same directory.

LSP-powered document outlines

Enable language-server document symbols for record-oriented outline entries (one per record, named from its most informative key, with expandable top-level fields):

{ "languages": { "JSON Lines": { "document_symbols": "on" } } }

Record inspection

• Hover any record to see it pretty-printed in a popup.
• Code actions (cmd-. on a record) offer Expand record into indented JSON and Compact record to one line — expand to read or edit comfortably, then compact back (or undo).

Formatting

jsonl-lsp advertises both documentFormatting and documentRangeFormatting, so Zed's standard formatter settings work for JSON Lines documents:

{
  "languages": {
    "JSON Lines": {
      "formatter": "language_server",
      "format_on_save": "on"
    }
  }
}

If another extension also registers a formatter for JSON Lines, the formatter setting above selects which one is used.

Server configuration

jsonl-lsp accepts initialization options under the jsonl key, forwarded from Zed's standard LSP settings:

{
  "lsp": {
    "jsonl-lsp": {
      "initialization_options": {
        "jsonl": {
          "allowBlankLines": false,
          "finalNewline": "preserve"
        }
      }
    }
  }
}