JSON Formatter & Validator

Prettify and validate JSON instantly — no data leaves your browser.

Instant result Runs in browser
Indent:

About JSON

{ "key": "value" }
[ 1, 2, 3 ]
true / false / null
"string"
42 / 3.14

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is human-readable, language-independent, and widely used in APIs and configuration files.

How to use?

  1. 1
    Paste your JSONPaste any raw or minified JSON string into the input area.
  2. 2
    Choose actionClick Format to prettify with indentation, or Validate to check for syntax errors.
  3. 3
    Copy the resultUse the Copy button to save the formatted JSON to your clipboard.

FAQ

Is my JSON data sent to a server?
No. All formatting and validation is performed entirely in your browser using JavaScript. Nothing is sent to any server.
What does "prettify" mean?
Prettifying (or formatting) JSON adds consistent indentation and line breaks so the structure is easy to read. It does not change the data, only its presentation.
What does the validator check?
The validator checks that your JSON is syntactically correct: matching braces and brackets, properly quoted keys, no trailing commas, and valid value types.

What Is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based data format derived from JavaScript. It is language-independent and supported by virtually every programming language. JSON is the dominant format for REST APIs, configuration files, and data exchange between services.

Why Format JSON?

Raw or minified JSON is difficult to read. Formatting adds indentation and newlines so the object hierarchy is immediately visible. This is especially useful when debugging API responses or editing configuration files.

Why Validate JSON?

A single missing comma, unmatched bracket, or unquoted key breaks JSON parsing. The validator catches these errors instantly so you can fix them before deploying code or sending a request.

Privacy

All processing happens in your browser. Your JSON data is never uploaded to any server.

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