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JSONL

v0.1.1 · by Ofer Affias · added 3 November 2026

JSON Lines (JSONL) syntax highlighting support for Zed

Languages
Install in Forge SuperView the source

How to install

With Forge Super installed, the button above opens the app on this extension, where you press Install. Nothing is installed until you do.

You can also open the Extensions panel in the app and search for JSONL. The extension's id is jsonl.

Don't have Forge Super yet? Download it here.

README

From the extension's repository, written by its authors and not by Mentenaz. See the source.

JSONL Syntax - Zed Extension

A Zed editor extension that provides syntax highlighting for JSON Lines (JSONL) and Newline Delimited JSON (NDJSON) files.

Overview

JSON Lines is a format for storing structured data with one JSON object per line. Each line is a valid JSON value, making it suitable for streaming and processing large datasets.

{"name": "John", "age": 30}
{"name": "Jane", "age": 25}
{"name": "Bob", "age": 35}

Features

  • Syntax highlighting for .jsonl and .ndjson files
  • Automatic file detection
  • Tree-sitter JSON parser for accurate highlighting
  • 2-space indentation default
  • Performance optimized for large files

Installation

Development Installation

  1. Clone this repository:

    git clone https://github.com/[your-username]/jsonl-syntax
cd jsonl-syntax

  2. In Zed, open command palette (Cmd+Shift+P / Ctrl+Shift+P)

  3. Run "zed: install dev extension" and select the jsonl-syntax folder

Usage

Open any .jsonl or .ndjson file in Zed to see syntax highlighting automatically applied.

Development

Project Structure

jsonl-syntax/
├── extension.toml          # Extension configuration
├── languages/
│   └── jsonl/
│       ├── config.toml     # Language settings
│       └── highlights.scm  # Highlighting rules
├── sample.jsonl           # Test file
└── validate.py           # Validation script

Making Changes

  1. Edit highlighting rules in languages/jsonl/highlights.scm
  2. Modify language settings in languages/jsonl/config.toml
  3. Reload extensions in Zed: "zed: reload extensions"
  4. Test changes with sample files

Contributing

Contributions are welcome.

  1. Fork the repository
  2. Create a feature branch
  3. Make your changes
  4. Test thoroughly
  5. Submit a pull request

Technical Details

This extension uses the tree-sitter-json grammar for parsing. Each JSONL line is treated as a separate JSON document for highlighting purposes.

License

MIT License - see LICENSE file for details.

Related Resources