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JSON tools

Everything you need for JSON in one place. Paste your data or drop a file, then format it, explore it as a tree, check it for errors or convert it to CSV. Your data stays in your browser the whole time.

Your files never leave your device. Everything runs in your browser.

How it works

  1. Add your dataPaste JSON or CSV, type it, open a file or drop it onto the input box. Try Sample to see how it works.
  2. Pick what to doFormat, view as a tree, validate, minify or convert. The result updates as you type.
  3. Copy or downloadCopy the result with one click or download it as a file.

Fast and private JSON tools

JSON is everywhere: API responses, configuration files, exports from online stores and marketplaces. These tools help you read it, fix it and turn it into something else without installing anything.

Many online JSON tools send your data to a server. Here the work happens in your browser, so API keys, customer lists and order exports never leave your computer.

Which tool do you need?

Use the formatter to make compact JSON readable, the viewer to explore large documents as a tree and the validator to find the exact place of a syntax error.

The minifier removes all spaces to make files smaller, and the CSV converters move data between JSON and spreadsheets in both directions.

Frequently asked questions

Is my data uploaded anywhere?

No. Everything runs in your browser. Your JSON and CSV data is not sent to our servers.

How big can my JSON be?

Files of several megabytes work well. Very large files depend on your device's memory. Coloring is turned off for very large results to keep the page responsive.

Why does the tool say my JSON is invalid?

Common causes are a missing comma, a trailing comma before a closing bracket, single quotes instead of double quotes, or comments. The error box shows the line and column so you can fix it quickly.

Does it work without an internet connection?

Yes. After you open the page once, it keeps working even if your connection drops.