Why is my JSON on one line?

JSON minifiers remove all whitespace (spaces, tabs, newlines) to reduce file size. The data is the same — it just has no formatting. Use FixTools to expand it back to a readable form.

Can I format minified JSON that is hundreds of kilobytes?

Yes. FixTools processes JSON entirely in your browser with no file size restriction. Very large JSON files may take a moment to render but will format correctly.

What is the difference between minified and invalid JSON?

Minified JSON is valid but compact. Invalid JSON has syntax errors (missing commas, wrong quotes, etc.). FixTools can tell the difference and will report errors if the JSON is actually invalid rather than just minified.

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Format Minified JSON

Minified JSON is intentionally stripped of whitespace — great for network transfer, terrible for reading. Paste any single-line minified JSON into FixTools and it expands it into clean, indented, readable output instantly.

⚡ Use Tool Now How it works

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

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Expands any compressed JSON instantly

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Syntax-highlighted readable output

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No size limit on minified input

JSON Tool

JSON Formatter

All processing happens in your browser — your files are never uploaded to any server.

🚀Open JSON Formatter

100% Free · No account · Works on any device

How to use this tool

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Paste your minified JSON (typically a single long line) and click Format to expand it.

How It Works

Step-by-step guide to format minified json:

1
Paste minified JSON
Copy the compressed single-line JSON and paste it into the editor.
2
Click Format
FixTools expands the JSON into human-readable indented format.
3
Edit and optionally re-minify
Read or edit the expanded JSON. Use Minify JSON if you need to compress it again after editing.