JSON Formatter & Beautifier

Free Online JSON Formatter, Beautifier & Validator

Our JSON Formatter instantly transforms raw, minified, or messy JSON into clean, readable, indented output with full syntax highlighting. Whether you're debugging an API response, inspecting a configuration file, or preparing data for documentation — this tool makes JSON readable in one click.

Key Features

• Instant Formatting: Paste JSON and get beautifully indented output with color-coded syntax highlighting. Keys, strings, numbers, booleans, and null values are each distinctly colored.
• JSON Validation: Invalid JSON is detected immediately with descriptive error messages including the approximate line number of the issue.
• Minification: Compress your JSON by removing all unnecessary whitespace — perfect for reducing payload sizes in API requests and configuration files.
• Configurable Indentation: Choose between 2 spaces, 4 spaces, or tab indentation to match your project's code style.
• Auto-Format on Paste: Simply paste your JSON and it formats automatically — no button click needed.
• Privacy First: Your data never leaves your browser. All processing happens 100% client-side using JavaScript's native JSON.parse() and JSON.stringify().

Common Use Cases

• API Debugging: Copy a raw API response from your browser's DevTools Network tab, paste it here, and instantly see the structured data.
• Configuration Files: Format package.json, tsconfig.json, .eslintrc.json, and other config files for readability.
• Database Records: Inspect MongoDB documents, Firebase snapshots, or DynamoDB items in a human-readable format.
• Data Transformation: After formatting, use our JSON to CSV converter to transform your data into spreadsheet format.

JSON Formatting Example

Input (minified):

{"users":[{"id":1,"name":"Alice","email":"alice@example.com","roles":["admin","editor"]},{"id":2,"name":"Bob","email":"bob@example.com","roles":["viewer"]}]}

Output (formatted with 2-space indent):

{
  "users": [
    {
      "id": 1,
      "name": "Alice",
      "email": "alice@example.com",
      "roles": [
        "admin",
        "editor"
      ]
    },
    {
      "id": 2,
      "name": "Bob",
      "email": "bob@example.com",
      "roles": [
        "viewer"
      ]
    }
  ]
}

Keyboard Shortcuts

• Ctrl + Enter (or Cmd + Enter on Mac) — Format JSON
• Paste — Auto-formats immediately

Why Use JSONCSV.tools JSON Formatter?

1. Zero Installation: No extensions, no downloads — just open and paste.
2. Complete Privacy: Unlike many online formatters, we process everything locally in your browser. Your API keys, tokens, and sensitive data stay on your machine.
3. Part of a Toolkit: After formatting, convert to CSV, Excel, or TSV — all within the same site.