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Read structured data clearly

JSON Formatter and Validator

Paste JSON to check its syntax and turn dense data into an indented view. Switch to compact output when you need a smaller text payload.

Private by default

Processing stays in your browser. Your text is not sent anywhere by this tool.

Use the tool

Add your file or text below, adjust the options if needed, then download the result.

Loading the local processor…

You can add

Pasted JSON, .json, Plain text

You will get

Formatted JSON, Minified JSON, Validation result

How to use JSON Formatter and Validator

  1. 1

    Paste JSON

    Add the object or array you need to inspect.

  2. 2

    Format or minify

    Choose an indented view or compact output and resolve any parse error.

  3. 3

    Copy the result

    Copy valid JSON or download it as a text file.

When this tool is useful

  • Inspect an API response copied from development tools.
  • Minify a small configuration payload.
  • Find a missing comma or quote in edited JSON.

Browser and format limits

  • Validation checks JSON syntax, not whether the data matches an external schema.
  • Comments and trailing commas are not valid JSON and produce an error.
  • Extremely large values can slow the editor and formatter.

Practical tips

TIP 1

Read the error position and inspect the characters immediately before it.

TIP 2

Use two-space indentation for a compact but readable view.

TIP 3

Do not paste secrets, tokens, or credentials into any utility unnecessarily.

JSON Formatter and Validator questions

Does this validator check a JSON Schema?

No. It checks whether the text parses as JSON, not whether its values match a separate schema definition.

Why are comments rejected?

Standard JSON does not allow comments. Remove them or use a format designed to support comments.

What does minifying JSON do?

It removes optional indentation and whitespace while keeping the same parsed data structure.

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