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Sync settings

Choose what your account keeps in step on every device where you are signed in.

  • My tools

    Always synced: the tools on your board, their order and size.

  • The windows open on your start page, including what you typed in them.

  • Every note in the notepad – on the notepad page, on your board and in windows.

  • Every list of website shortcuts – on the shortcuts page, on your board and in windows.

  • Every grid in the cover grid maker – on its page, on your board and in windows.

  • Every list of bookmarked organisations in the OIN lookup – on its page, on your board and in windows.

  • Keeps your pipeline and saved recipes on all your devices. Your files are never synced – only the steps and settings.

Turning something off removes it from your account straight away. Your devices keep their own copy.

Notifications

Tools that can tell you about something new while a Synsi tab is open, even when you are in another tab or app. Choose them for this browser.

This browser cannot show notifications from websites.
Notifications are blocked for this site. Allow them in your browser’s site settings (the icon left of the address), then switch them on here.

  • Says “New message” while a Synsi tab is open – never who wrote it or what.

Your choice is stored in this browser only. Notifications never show personal content such as a message or a number. They work while a Synsi tab is open; closed tabs get none.

Browse all tools →

JSON Formatter, Beautifier and Validator

Paste JSON to pretty-print it with your preferred indentation, minify it, or check whether it is valid.

My tools →
Runs in your browser – your data never leaves your device Also available via our free API

How to use the JSON Formatter & Validator

  1. 1 Paste your JSON into the input box.
  2. 2 Choose Beautify, Minify or Validate (and the indentation for beautify).
  3. 3 Copy or download the result, or read the validation message.

Make JSON readable

API responses and configuration files are often delivered as one long line of JSON. Beautifying adds line breaks and indentation so you can see the structure at a glance – nested objects, arrays and values each get their own line.

Minify for production

Minifying does the opposite: it removes all unnecessary whitespace to make the JSON as small as possible. That reduces payload size for APIs, local storage and configuration that is sent over the network.

Validate and find errors

Invalid JSON is one of the most common causes of failing API calls. The validator reports the problem so you can fix it quickly. Typical mistakes:

  • Trailing commas: {"a": 1,}
  • Single quotes instead of double quotes: {'a': 1}
  • Unquoted keys: {a: 1}
  • Comments, which standard JSON does not allow
  • Unescaped line breaks or quotes inside strings

Your data stays private

JSON often contains API keys, tokens or customer records. This formatter runs entirely in your browser, so nothing you paste is uploaded or logged. Developers can use the same formatter through our API.

Frequently asked questions

What is the difference between formatting and validating?

Formatting (beautifying) changes the whitespace to make JSON readable. Validating only checks whether the JSON is syntactically correct. Both modes report invalid JSON.

Should I use 2 spaces, 4 spaces or tabs?

It is a matter of style. Two spaces is common in JavaScript projects and APIs, four spaces in Python and PHP, and tabs let every reader choose their own width.

Does the formatter change my data?

No. Only whitespace changes; keys, values and their order stay exactly the same.

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