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JSON Formatter & Validator

Pretty-print and validate JSON with error positions.

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How to use

  1. Paste your text into the box.
  2. Tap Format JSON.
  3. Copy or download the result.

Worked example

With a compact JSON object:

VALID JSON2 top-level keys
  • Characters: 34
  • Formatted lines: 4

Common questions

How do I format and validate JSON online?

Paste your JSON above and tap Format JSON. Valid input is pretty-printed with indentation; invalid input shows where the error is.

Is my JSON uploaded anywhere?

No - validation and formatting run entirely in your browser.

What usually makes JSON invalid?

The most common causes are trailing commas, single quotes instead of double quotes, and unquoted keys.

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