Free JSON Viewer Online

JSON Formatter & Validator

This free online JSON viewer formats and validates your JSON instantly. Paste raw or minified JSON and it is pretty-printed into a clean, readable structure with syntax highlighting. Invalid JSON is detected automatically and common errors are fixed silently, so you can format and validate API responses, config files, and log data in seconds — right in your browser.

How to Use the JSON Viewer

  1. Paste your JSON into the input area (or upload a file).
  2. Click the Viewer tab to format and validate it.
  3. Explore the collapsible tree, search keys and values, and copy any value or path.
  4. Switch to the Visualizer tab to see the same JSON as an interactive node graph — pan, zoom, search, collapse, and export it as an image.
  5. Click Share to get a URL that reopens the same JSON — handy for sharing a payload with a teammate or linking it from your own app.

Features

  • Tree View — explore nested JSON as a collapsible tree
  • Graph Visualizer — see JSON as an interactive node graph with pan, zoom, collapse, search, and image export
  • Search — find keys, values, and content instantly
  • Dark/Light Theme — comfortable viewing in any environment
  • 5MB file support — handle large JSON files and API responses
  • No signup required — start using it immediately
  • Copy values and paths — grab exactly what you need

Frequently Asked Questions

What is a JSON viewer?

A JSON viewer is a tool that formats and displays JSON data in a readable, collapsible tree structure, making it easy to explore and debug.

Is this JSON viewer free?

Yes, completely free. No signup, no limits, no hidden fees.

What is the maximum file size supported?

The tree Viewer handles JSON files up to 5MB.

Can I view JSON as a graph or diagram?

Yes. Switch to the Visualizer tab to see your JSON as an interactive node graph — objects and arrays become connected nodes you can pan, zoom, search, collapse, and export as an image. Very large documents are rendered partially to stay responsive.

Can I link to the viewer with JSON already loaded?

Yes. A link like /#data=<compacted-json> opens the tool with that document loaded, so any app, script, or dashboard can add a "View JSON" button. Documents too large for a URL are handed over via the clipboard using ?data=clipboard. The JSON is encoded and decoded in your browser and is never sent to a server. See the deep link guide.

Does it save my JSON data?

No. All processing happens in your browser. Nothing is sent to our servers.