Data helper

JSON Formatter

Format, minify, and validate JSON instantly by pasting your data.
Pretty-print JSON with consistent indentation or minify it to reduce size, then copy the output with a single click.

This tool helps you quickly detect syntax errors and verify JSON structure, making it ideal for debugging API responses, configuration files, and test data.
Clear formatting improves readability, while minified output is useful
for transmission and storage.

All processing is performed directly in your browser.
No JSON data is sent to any server, ensuring a fast and secure experience
for developers and anyone working with structured data.

Enter JSON

Result

Guide

How to use & features

Paste JSON into the input area and click Format or Minify to see the result.
If parsing fails, an error message with a line number helps you fix it quickly.
Copy or download the formatted output to share with scripts or teammates.
All operations run locally—no data is uploaded.

Samples

Sample input & output

Pretty-print JSON

Input

{"name":"Taro","age":28,"active":true}

Output

{
  "name": "Taro",
  "age": 28,
  "active": true
}

FAQ

Frequently asked questions

Do you support JSON5 or comments?

Only standard JSON is supported. Comments or trailing commas will surface as parse errors, so remove them before pasting.

What is the difference between format and minify?

Format adds indentation for readability, while minify strips whitespace and line breaks to reduce size.

How are errors shown?

Parsing failures return a message with a line number. Fix the highlighted area and run the formatter again.

Use cases

Common use cases

Formatting API responses
Pretty-print nested payloads so reviews and debugging sessions are easier to follow.
Minifying before embedding
Shrink JSON for query parameters or code snippets to avoid hitting length limits.
Catching syntax issues quickly
Spot trailing commas or missing quotes the moment you paste the payload.

Notes

Notes & limitations

Work stays in your browser
Inputs and outputs remain local. Closing the tab or clearing cache will remove any temporary state.
Validate critical data
Results are helper outputs—double-check them before sending to production systems or sharing externally.
Large payloads depend on your device
Very large text or files can feel slow in some browsers. Use a desktop environment for heavy workloads.