~/tools/JSON Formatter & Validator
2026·09·08
toolDatafree

JSON Formatter & Validator

Beautify, minify, and validate JSON in your browser.

Türkçe: JSON Formatlayıcı ve Doğrulayıcı

Waiting for input…
Output

Runs entirely in your browser. Nothing you paste is uploaded, logged, or stored.

What it does

Paste any JSON payload and this tool re-indents it for readability, collapses it to a single line, or tells you exactly where the syntax breaks. Everything happens locally in your browser with the native JSON parser, so your data never leaves the page.

When it's useful

  • Inspecting an API response you copied from the network tab.
  • Cleaning up a minified config file before committing it.
  • Shrinking a formatted blob before pasting it into a code string.
  • Finding the trailing comma or missing quote that's breaking a parse.

FAQ

Is my JSON uploaded anywhere?
No. Formatting and validation run entirely in your browser using the built-in JSON parser. Nothing is sent to a server.
Why does it say my JSON is invalid?
The tool uses the same strict parser browsers use. Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or comments — none of which are valid JSON.

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