Sonnet: JSON Viewer & Editor

machado001

In-app purchases

About this app

Sonnet: The Cleanest Way to View JSON.

Need to quickly inspect a JSON file or save a snippet for later? Sonnet is a JSON viewer and JSON editor built for developers who want simplicity without the clutter. No complex configurations, no crashes—just open JSON files and read.

Why use Sonnet?

📂 Drafts Workspace Don't lose your work. Sonnet, your JSON editor, lets you create and save Drafts locally. Keep your snippets organized and accessible even after you close the app.

✨ Clean Tree View However messy or minified the source file is, this JSON viewer always renders it as a clean, indented, collapsible structure you can explore.

📝 Tap-to-Edit Need to make a quick change? As a JSON editor, Sonnet lets you tap any value in Tree view to edit it in place, add or delete nodes, or copy the clean Code view for pasting elsewhere.

🔤 Formatted or Minified Code view doubles as a JSON formatter: switch between pretty-printed and minified output with one tap, then copy or share whichever you need.

🛠️ Smart Auto-Fix Typo in a hand-written or generated file? Sonnet automatically repairs common mistakes—missing commas, unquoted keys, single quotes—the moment you open it, and only warns you if something truly can't be parsed.

🔒 100% Offline & Private Sonnet processes everything locally on your device. Your data never touches a server.

Key Features:

Open Files: Import JSON files from your device storage, or open them straight from any other app—Sonnet works as a JSON file opener from your file manager, browser, or a share sheet.

JSON File Viewer: Read JSON files in a clean, scrollable Tree or Code view.

Tree Visualization: Expand/collapse nodes to instantly turn minified or messy JSON into a clean, readable structure.

JSON Reader: Open and read messy or minified JSON files without changing them until you choose to edit.

JSON File Editor: Edit values, add or remove nodes, and save your changes as a local draft.

JSON Formatter: Toggle between formatted and minified JSON in Code view before you copy it.

Auto-Fix: Repairs common JSON mistakes automatically, and flags anything it truly can't fix.

Local Drafts: Save your work-in-progress files.

Dark Mode: Native support for comfortable late-night coding.

⭐ Sonnet Pro (optional, one-time purchase): search inside any document and open JSON files up to 50 MB (20 MB free). No subscription, and no ads either way.

Whether you need to open JSON files from a download, read JSON files shared from another app, or edit a config on the go, Sonnet is the JSON file viewer and JSON file editor that stays out of your way.

Download Sonnet — your offline JSON viewer, JSON reader, JSON formatter, and JSON file opener.

What’s new

Fixed the Save button disappearing when you edit a value that grows to many lines: the value now scrolls and Save stays on screen. Also includes the fix for a crash in the Code view after a file changes, for example after minifying it.