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Format Minified JSON for Reading and Debugging API Responses

Server returned a 50-line JSON blob on one line? Paste it in, get clean indented output you can actually read.

Minified JSON saves bytes in production but is unreadable when debugging. API responses, log entries, webhook payloads — they all come back as one giant line. A browser-based formatter parses, validates, and indents so you can find the bug.

Open JSON Formatter & Validator

Step-by-step

1

Copy the minified JSON

From your terminal, log file, browser DevTools network tab, or API response — copy the whole JSON string.

2

Open the JSON Formatter

Launch the tool below.

3

Paste and format

Drop the JSON in. The tool indents, color-codes, and validates. If there's a syntax error, the tool highlights the exact location.

4

Copy the formatted output

Click to copy the cleaned version. Paste back into your code, docs, or wherever you need it readable.

Ready to try it?

Format and validate JSON data. Free, no signup, runs in your browser.

Open JSON Formatter & Validator

Frequently asked questions

Will the formatter fix invalid JSON?

It identifies the exact location of syntax errors but doesn't auto-fix them — that's intentional. Auto-fixing would mask real bugs in your data. Use the error message to find and fix the source.

Is my JSON data sent to a server?

No. The formatter runs entirely in your browser using native JavaScript JSON parsing. Even sensitive API responses (auth tokens, user data) never leave your device.

How do I format JSON in command line vs. browser?

Command line: python -m json.tool or jq. Browser is faster for one-off debugging — paste, see result, move on. CLI better for automation and pipelines.

What's the largest JSON file the formatter handles?

Limited by your browser's memory. In practice, anything under 50MB formats instantly. Very large files (100MB+) may freeze the tab — for those, use a command-line tool like jq.

Related use cases

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Try JSON Formatter & Validator now

100% free. No signup. Your files never leave your device.

Open JSON Formatter & Validator