NexaLab Toolbox
Free tool

🧩 JSON/CSV Formatter

Free online JSON/CSV formatter. Pretty-print or minify JSON, spot syntax errors instantly, and render CSV as a readable table with automatic delimiter detection.

Result
Result appears here

When this comes in handy

Use it when you need to make a minified JSON log from an API response readable, when you want to visually verify a CSV file exported from Excel or another tool, or when a JSON config file has a syntax error and you can't tell where.

How to use it

① Choose the JSON or CSV tab and paste your data. ② The formatted result or table updates automatically — for JSON, you can switch between pretty-print and minify and adjust the indent size. ③ Copy the result to your clipboard or download it as a file.

Why this tool exists

Checking logs or API responses shouldn't require signing into yet another tool just to paste some text. This one opens instantly, requires no account, and never stores anything you paste into it.

Frequently asked questions

Is my data stored on a server?
No. Everything is processed entirely in your browser and nothing is ever stored anywhere.
Can it handle large files?
JSON/CSV up to a few megabytes works smoothly. Inputs larger than about 5MB may slow down depending on your browser — consider splitting large files.
What if the CSV delimiter isn't detected correctly?
Use the delimiter dropdown to manually choose comma, semicolon, or tab.
Can I see exactly where a JSON error is?
Yes — the formatter reports the exact line and column of any syntax error.
Can I convert between JSON and CSV?
Not yet — this version supports formatting, validating, and viewing each format. JSON↔CSV conversion is being considered for a future update.