JSON Viewer
Paste JSON to format it with syntax highlighting, explore it in a collapsible tree view, validate errors with exact positions, and minify it — all instantly in your browser.
// Your formatted JSON will appear here.
Everything runs in your browser — nothing is sent anywhere. Tip: in Tree View, click a key to copy its path, click ▾ to collapse a node.
How to use
The JSON Viewer is a free online tool — no sign-up or download is required. Paste JSON to format it with syntax highlighting, explore it in a collapsible tree view, validate errors with exact positions, and minify it — all instantly in your browser.
- Paste JSON, upload a .json file, or click Load Sample.
- Click Format / Validate — valid JSON is pretty-printed with colors; errors show the exact line and position.
- Switch to the Tree View tab to explore nested objects, collapse nodes, and copy key paths.
- Use Minify, Copy Output or Download .json as needed.
Frequently asked questions
What does the JSON Viewer do?
Paste JSON to format it with syntax highlighting, explore it in a collapsible tree view, validate errors with exact positions, and minify it — all instantly in your browser.
How do I use the JSON Viewer?
Open the JSON Viewer page, enter or upload your input using the form above, then click the main action button to get your result instantly. You can copy or download the result when you are done. No sign-up or installation is needed.
Is the JSON Viewer free to use?
Yes. The JSON Viewer is completely free, like every tool on SEO Tools by metacalculator.org. There is no sign-up, no watermark and no hidden limits.
Is my data private when I use the JSON Viewer?
Yes. This tool runs entirely in your browser, so your input never leaves your device. Nothing is uploaded, stored or shared.