About the JSON Viewer
Paste any JSON document and instantly see it beautified and rendered as a collapsible tree. Use Format to pretty-print, Minify to compress it to a single line, and Copy to grab the result. Invalid JSON is flagged inline with the exact line and column so you can fix it fast.
Everything is processed in your browser — your data never leaves your device, which makes this viewer safe for inspecting API responses, config files and other sensitive payloads.
Features
- Pretty-print and minify JSON in one click
- Interactive, collapsible tree view
- Inline validation with line and column errors
- Syntax-colored by value type
- Copy the formatted output to your clipboard
- 100% client-side — your data stays private
How to use the JSON viewer
- Paste or type your JSON into the input on the left.
- Click Format to beautify it, or Minify to compress it.
- Switch between Tree and Raw views to explore the structure.
- Fix any inline errors, then click Copy to grab the result.
Frequently asked questions
Is my JSON uploaded anywhere?
No. All parsing and formatting happens locally in your browser, so your JSON never leaves your device.
What happens if my JSON is invalid?
The viewer highlights the problem inline and shows the exact line and column, along with a hint about the likely cause, such as a trailing comma.
How large a document can it handle?
It comfortably handles typical API responses and config files. Very large files of tens of megabytes may be slow because everything runs in the browser.
What's the difference between Format and Minify?
Format pretty-prints the JSON with indentation for readability, while Minify strips all whitespace to produce the smallest single-line version.