JSON Viewer
Explore JSON as a collapsible tree instead of a wall of text.
Everything is processed in your browser. Nothing you paste is uploaded or stored.
About these formats
A viewer turns a nested document into something you can navigate. Collapse the branches you do not care about and the shape of the data becomes obvious — far easier than scrolling raw text looking for a matching bracket.
How to use this tool
- Paste your JSON on the left.
- The tree appears on the right; click any node to fold or unfold it.
- Use Expand all and Collapse all to move through a large document quickly.
Frequently asked questions
Is my JSON sent to a server?
No. Everything happens in your browser. Nothing you paste is uploaded, logged or stored, which matters when the document contains keys, tokens or personal data.
Why is my JSON reported as invalid?
The most common causes are trailing commas, single quotes instead of double quotes around keys and strings, and unescaped line breaks inside a string. The error message gives the line and column of the first problem.
Does it change my data?
No. The document is parsed and re-serialised, so only whitespace changes. Key order is preserved and values are untouched.
Can it handle large documents?
Yes, within your browser's memory. Documents of a few megabytes are fine; extremely large files may make the page pause briefly while it parses.