{ }

JSON Formatter

Format, validate, and beautify JSON with proper indentation.

FREE

DeveloperUse via API or MCP

JSON Formatter is available via the lots.tools REST API and MCP server. Generate an API key to get started.

REST API

POST https://lots.tools/api/v1/tools/json-formatter/execute

curl -X POST https://lots.tools/api/v1/tools/json-formatter/execute \
  -H "Authorization: Bearer lt_<your-api-key>" \
  -H "Content-Type: application/json" \
  -d '{
  "input": {
    "json": "{\"key\": \"value\"}",
    "indent": 2
  }
}'

Input fields

jsontextareaJSON Input

indentnumber?Indentation Spaces

Response

{
  "success": true,
  "output": { ... },
  "credits_used": 0,
  "execution_time_ms": 120
}

MCP Server

Connect once and all lots.tools are available as MCP tools — including JSON Formatter. Add to your MCP client config:

{
  "mcpServers": {
    "lots-tools": {
      "url": "https://lots.tools/mcp",
      "headers": {
        "Authorization": "Bearer lt_<your-api-key>"
      }
    }
  }
}

Works with Cursor, Claude Desktop, and any MCP-compatible client. The tool name in MCP is json-formatter.

See the full tools list for schemas of all available tools. Credits are deducted per execution.

JSON Formatter

This online JSON Formatter is a crucial tool for developers and anyone working with JSON data. It allows you to quickly and efficiently format, beautify, and validate JSON code directly in your browser, ensuring your data is always well-structured and error-free.

What This Tool Does

The JSON Formatter takes raw or unformatted JSON input and restructures it into a readable, indented format. Beyond simple formatting, it also validates the JSON syntax, identifying and highlighting any errors that might be present in your data. This dual functionality makes it an indispensable utility for debugging and maintaining JSON files.

How It Works

Simply paste your JSON input into the provided input area. You can then specify your desired indentation level using spaces. The tool processes the input, applies the chosen indentation, and validates the syntax. The formatted and validated JSON is then displayed, ready for review or download.

Key Features

JSON Validation: Automatically checks for syntax errors in your JSON input.
Customizable Indentation: Allows you to set the number of spaces for indentation, tailoring the output to your preferences.
JSON Beautifier: Transforms minified or unorganized JSON into a clean, human-readable structure.
Download Formatted Results: Provides an option to download the beautified and validated JSON for offline use.
Free and Online: Accessible directly through your web browser without any installation or cost.

Who This Tool Is For

This JSON Formatter is designed for a wide range of users, including:

Web Developers: For formatting API responses, configuration files, and data structures.
Backend Developers: For validating and beautifying JSON data exchanged between services.
Data Scientists: For preparing and inspecting JSON datasets.
Anyone working with JSON: Who needs a fast, reliable way to format and validate JSON.

FAQ

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write and easy for machines to parse and generate.

How do I use the JSON Formatter?

Paste your JSON data into the input field, select your preferred indentation level, and the tool will automatically format and validate your JSON.

Can I validate my JSON with this tool?

Yes, the JSON Formatter includes a built-in validator that checks for syntax errors in your JSON input.

Is this tool free to use?

Yes, this is a free online JSON formatter and validator.

Can I customize the indentation?

Absolutely. You can specify the number of spaces you want to use for indentation to suit your formatting style.

Can I download the formatted JSON?

Yes, after formatting, you will have the option to download the beautified JSON file.