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JSON Formatter

Beautify your JSON data with proper indentation and formatting for better readability.

What is the JSON Formatter?

The JSON formatter takes raw or minified JSON and prints it back with consistent indentation so it is easy to read, diff and debug. It also validates as it goes: the parser is Python's json module, so anything that is not valid JSON comes back with the exact error and position instead of silent, malformed output.

Paste an API response, a config file or a one-line blob, pick how many spaces you want per level, and you get clean, structured output you can copy straight back into your editor.

How to use the JSON formatter

  • 1. Paste your JSON into the Input JSON field on the left.
  • 2. Choose the indentation size - 2, 4 or 8 spaces.
  • 3. Click Format JSON (or press Ctrl+Enter) to beautify and validate it.
  • 4. The formatted JSON appears on the right - click Copy to grab it, or Sample to load an example.

Features

  • Pretty-prints with 2, 4 or 8-space indentation.
  • Validates while it formats and reports the parse error and position.
  • Keeps non-ASCII characters intact instead of escaping them.
  • Sample, Copy and Clear buttons, plus a Ctrl+Enter shortcut.
  • Free to use, no account required.

Common uses

Making sense of a minified API response, tidying a config file before committing it, spotting the missing comma or bracket the parser complains about, or reformatting JSON to a team's preferred indentation. When you then need to shrink that JSON for an LLM prompt, the JSON to TOON converter cuts the token count.

FAQ

Does this validate my JSON?

Yes. It parses your input with a strict JSON parser, so invalid JSON returns the exact error message and position instead of malformed output.

What indentation can I choose?

2, 4 or 8 spaces per nesting level. 2 spaces is the compact default; 4 is easier to read for deeply nested data.

Why does my JSON show an error?

The input is not valid JSON - common causes are trailing commas, single quotes instead of double quotes, or unquoted keys. The error message points to the position to fix.

Is my JSON uploaded?

The formatting runs on our server, so your JSON is sent there to be parsed and is not stored. Avoid pasting secrets you would rather not transmit.

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