JSON Formatter Online

How to use the JSON Formatter

1. Enter or paste your input in the tool above.
2. Choose the available options and select Run tool or Process locally.
3. Review, copy, or download the generated result.

What does the JSON Formatter do?

JSON becomes difficult to review when APIs, logs, or configuration files place everything on one line. This formatter parses the document first, so invalid JSON produces an error instead of misleading output, and then serializes valid data with two-space indentation.

Common uses

• Inspect API responses and webhook payloads
• Review configuration and package metadata
• Make minified JSON easier to debug or share

JSON Formatter example

Example input

{"user":{"id":42,"active":true},"roles":["admin","editor"]}

Example output

{
  "user": {
    "id": 42,
    "active": true
  },
  "roles": [
    "admin",
    "editor"
  ]
}

Limitations and important notes

• Comments and trailing commas are not valid JSON
• Formatting changes whitespace, not values or key order
• Very large documents still depend on available browser memory

Private browser-based processing

Your data is processed locally in your browser and is not uploaded or stored on our servers. Tool inputs are not saved to local storage.

JSON Formatter features

• Free to use with no registration
• Fast client-side processing
• Clear validation and useful error messages
• Copy and download support
• Mobile-friendly accessible interface

Frequently asked questions