loper

Loper · Developers

Open .json files on your Mac.

.json .jsonc .json5

Package manifests, API responses and settings. Keys, strings, numbers and booleans in color, with a nested key tree and folding.

Loper is a free, minimal editor for macOS that opens JSON instantly and colors every part of the file, so you find the value you need at a glance and can fix it right there. No IDE, no project to load, no gray wall of text.

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package.json opened in Loper: JSON with color-coded JSON
Show the file as text
{  "name": "shop-api",  "version": "2.4.1",  "private": true,  "scripts": {    "dev": "vite",    "test": "vitest run"  },  "engines": { "node": ">=20" },  "workspaces": ["apps/*", "packages/*"]}

How to open .json files

  1. Download Loper (free, Apple silicon, signed and notarized) and move it to Applications.
  2. Double-click your .json file, drag it onto the Loper window, or right-click it and choose Open With › Loper.
  3. Want every .json file to open in Loper? Choose Loper › Make Loper the Default Editor….

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