SnappyJSONSnappyJSON
Free & Open Source

The JSON viewer and editor developers actually want to use

Fast, beautiful, and surprisingly powerful. See your JSON structure, edit with precision, and find anything instantly — all in one delightful tool.

Download for Mac
100% Free No Account Required Your Data Stays Local
SnappyJSON interface showing tree view and editor side by side

Developers work with JSON constantly. Why are the tools so bad?

Too Cluttered

Feature-bloated tools are slow, overwhelming, and distract from what you're actually trying to do.

Out of Sync

Edit in tree view, text doesn't update. Fix something in text, tree breaks. Constant context switching.

Painfully Slow

Open a large JSON file and watch your tool freeze. Or crash. Or both.

SnappyJSON fixes all of this.

Everything you need. Nothing you don't.

Thoughtfully designed features that make working with JSON a joy.

Two-Pane Layout

Tree navigator on the left, Monaco editor on the right. See structure and raw text simultaneously. Resize to match your workflow.

Live Bidirectional Sync

Edit in the tree, see it update in the text. Fix a typo in the editor, tree reflects it instantly. No save buttons needed.

Smart Search

Find any key or value instantly. Use regex, case-sensitive, or build advanced queries like 'price > 30 AND status equals active'.

Path Navigation

Always know where you are with the breadcrumb bar. Click to zoom in. Copy the full JSON path with one click.

Transform Tools

Prettify, minify, or sort keys with one click. Get your JSON formatted exactly how you need it.

TypeScript Generation

Turn your JSON into TypeScript interfaces instantly. Copy to clipboard and keep building.

See structure. Edit text. Stay perfectly in sync.

The two-pane layout with live bidirectional sync is what makes SnappyJSON special. Navigate visually in the tree, edit precisely in text — both views update in real-time. No other tool does this as smoothly.

Live Sync

Click a tree node → editor scrolls instantly
Edit a value → tree highlights the change
Both views stay in perfect sync

Multi-Tab Support

Work with multiple JSON documents.

Compare files, manage related configs, switch with Cmd+1-9. Just like your favorite code editor.

tabs: users.json · config.json · logs.json

Beautiful Themes

Match your editor aesthetic.

7+ carefully crafted themes including Dark, Light, Monokai, Dracula, Nord, and Solarized. Syncs with your system preference.

DarkLightMonokaiDraculaNordSolarized

Multiple Input Methods

Get JSON in however you like.

Paste from clipboard, open from file, drag and drop, or fetch from any URL. Zero friction getting your data into the tool.

Drop file here or load from https://api.example.com/data

Built for Speed

  • Handles files up to 10MB smoothly
  • Lazy-loaded tree prevents UI freezes
  • < 150ms interaction delay target
  • Native Mac app — not Electron bloat

Privacy First

  • 100% local processing
  • Your JSON never leaves your machine
  • No cloud uploads
  • No telemetry or tracking
  • No account required

Built for developers who work with JSON every day

Software Developers

Debug API responses, edit config files, understand data structures.

DevOps Engineers

Inspect logs, edit deployment configurations, validate JSON payloads.

QA Engineers

Check API output, compare expected vs actual responses, explore test data.

Data Engineers

Explore JSON datasets, transform data, clean messy exports.

Keyboard-first design

Every action accessible via shortcuts.

Work at the speed of thought.

Paste JSONCmd+V
Open fileCmd+O
SearchCmd+F
Advanced SearchCmd+Shift+F
New tabCmd+T
Switch themeCmd+Shift+T
Navigate treeArrow keys
Edit valueEnter

Free. Forever.

SnappyJSON is completely free to use. No subscriptions, no premium tiers, no feature limits. Just download and start using it.

Download for Mac

Frequently Asked Questions

Ready to make JSON delightful?

Download SnappyJSON for Mac or try it in your browser. It's free.

Download for Mac