JSON Formatter Online

Format, validate, and minify JSON online in your browser. Choose two spaces, four spaces, or tabs for readable output, then copy or download the result.

In-Browser(Zero Server Uploads)

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Format, validate, or minify your JSON

Use Beautify / Format to make compact JSON easier to read. Choose Validate to check whether the current text can be parsed, or Minify to remove formatting whitespace.

The formatted or minified result replaces the text in the editor. Keep a copy of your original input if you need to compare versions. This tool checks JSON syntax; it does not validate data against an API contract or JSON Schema.

How It Works

The formatter passes the JSON text to the browser's built-in JSON parser when you choose Validate, Beautify / Format, or Minify. If parsing fails, the tool displays the error message supplied by the browser; wording and position details vary by browser. If parsing succeeds, the tool uses your selected 2-space, 4-space, or tab indentation, or removes formatting whitespace to minify the JSON. The JSON text is processed in the browser and is not included in Pexlii's tool usage events. When Google Analytics is available, those events include the tool name, category, and action type.

🔒 Your files and entered content are processed on this device and are not uploaded by this tool. Pexlii also loads Google Analytics for usage measurement; tool events include the tool name, category, and action type, not your files or entered content.

How to Use JSON Formatter

1

Paste your raw, minified, or unformatted JSON text into the editor.

2

Choose 2 spaces, 4 spaces, or tabs, then click "Beautify / Format".

3

Click "Minify" to remove JSON formatting whitespace.

4

Click Validate, Beautify / Format, or Minify to check whether the input is valid JSON.

Key Capabilities

JSON beautifier with customizable indentation (2 spaces, 4 spaces, tabs)

JSON minifier and whitespace compressor

Validate standard JSON and display the browser parser's error message

Load the built-in sample JSON

One-click copy and JSON file download

Application Scenarios

Debugging API responses and REST payloads during software development

Formatting configuration files (package.json, tsconfig.json)

Minifying JSON payloads to reduce bandwidth in production apps

Technical Constraints

•Strictly validates standard JSON format (keys and strings must use double quotes; comments are not valid standard JSON).

Frequently Asked Questions about JSON Formatter

How do I format and beautify a messy JSON string?

Paste JSON into the text area, choose an indentation size, and click 'Beautify / Format'. The formatted text replaces the input.

Is my confidential JSON data uploaded or logged on any server?

How does the tool show syntax errors in invalid JSON?

Can I minify JSON to save bandwidth in API requests?

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