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Data & Developer

JSON Formatter and Validator

Beautify, validate or minify JSON. If something is wrong, see the exact line and column.

Private by design — your data stays on your device.

Input JSON

Output

What does the JSON formatter do?

Paste JSON to beautify it with clean indentation, minify it, or check that it is valid. If there is a syntax error, this JSON formatter and validator shows the line and column with a plain-English explanation of what went wrong.

How to use the JSON formatter

  1. Paste your JSON into the input panel, or load the example.
  2. Choose “Format” to beautify, “Minify” to compress, or “Validate” to check it without changing it.
  3. If there is an error, read the message and use “Jump to error” to find it.
  4. Copy the result or download it as a .json file.

Your privacy

JSON is parsed in your browser. API responses, tokens and configuration you paste here are never uploaded to a server.

Read how MyToolsLab handles privacy

Frequently asked questions

What is the difference between a JSON formatter and a JSON validator?

A JSON validator checks whether the text follows the JSON standard and reports the first error. A formatter (or JSON beautifier) rewrites valid JSON with consistent indentation. This tool does both: it validates first, then formats.

What are the most common JSON errors?

Trailing commas after the last item, single quotes instead of double quotes, unquoted property names, and comments. All of these are allowed in JavaScript but not in strict JSON.

How do I minify JSON?

Paste your JSON and press “Minify”. Spaces, tabs and line breaks outside strings are removed, so the data is identical but the file is smaller.

Does formatting change my data?

Formatting only changes whitespace. If you tick “Sort keys”, object keys are reordered alphabetically, which doesn’t change the meaning of JSON. Very large numbers beyond JavaScript’s safe precision may lose digits, as in any browser-based tool.

Is it safe to paste private data into this JSON formatter online?

The tool makes no network requests with your data; everything is processed in the page. As a general habit, though, avoid pasting live secrets into any website you don’t need to.