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Developer Tools

JSON Formatter & Tree Viewer

Prettify and format JSON data with customizable indentation and an interactive collapsible tree viewer.

  • 100% free
  • Files stay on your device
  • No sign-up, no watermark
Indent:
Input JSON
Formatted Output

Related Developer Utilities

JSON Validator & Error Finder
Validate JSON syntax and report exact line and column of parsing errors with pointer highlighting.
JSON Minifier & Whitespace Compressor
Minify JSON payloads by removing excess whitespace with verified before-and-after byte count calculations.
Convert JSON to CSV
Convert arrays of JSON objects into tabular CSV format with automatic dot-notation flattening for nested objects.
JSON Diff – Compare Two JSON Documents
Compare two JSON objects side by side to highlight additions, removals, and structural value modifications.

What is JSON Formatter & Tree Viewer?

Format chaotic, unformatted API payloads into clean, readable JSON structures. Validates JSON syntax, identifies line numbers of missing commas or mismatched brackets, and supports tree view inspection with zero external network calls.

How to use JSON Formatter & Tree Viewer

  1. 1

    Add your file or input

    Choose a supported file, drag it onto the upload area, or type/paste the data this tool works with.

  2. 2

    Adjust the options

    Pick the output format, quality, size or other settings the tool offers. Defaults work well for most files.

  3. 3

    Process and download

    Run the tool and save the result. Processing happens in your browser, so nothing is uploaded to a server.

Frequently asked questions

Is my confidential API payload or credential data secure?

Yes, 100%. Parsing and formatting execute strictly inside your local browser JavaScript engine. No JSON strings or API responses are ever logged, cached, or transmitted across the internet.

Does the formatter support large JSON payloads (e.g. 10MB+)?

Yes! The virtualized code editor renders and formats multi-megabyte JSON payloads smoothly without freezing your browser tab.

Can I switch between 2-space, 4-space, and tab indentation?

Yes. You can customize indentation spacing to 2 spaces, 4 spaces, tabs, or compact minification with one click.

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