JSON Prettifier

Format and validate JSON with readable hierarchy and consistent indentation.

Last updated: March 2026 | By Patchworkr Team

Pretty mode

0 bytes in

JSON Input

Output Result

Result will appear here...

What is JSON?

JSON is a lightweight data-interchange format that is easy for humans to read and write and easy for machines to parse and generate. It is used everywhere from APIs to configuration files.

A prettifier makes compact JSON easier to scan by adding indentation and line breaks without changing the underlying data.

How to Use JSON Prettifier

Quick Steps

Step 1: Paste your JSON into the input field

Step 2: Select Pretty or Compact mode

Step 3: Choose the indentation size if Pretty mode is active

Step 4: Click Format JSON to generate the result

Step 5: Copy the formatted output when you are ready

Example

Input

{"name":"Alice","age":28,"skills":["JavaScript","Python","Go"],"active":true}

Output

{
  "name": "Alice",
  "age": 28,
  "skills": [
    "JavaScript",
    "Python",
    "Go"
  ],
  "active": true
}

Frequently Asked Questions

What's the difference between Pretty and Compact?

Pretty mode adds whitespace and line breaks. Compact mode removes unnecessary whitespace and produces smaller output.

Can I format large JSON files?

Yes. The formatting happens locally in your browser, so there is no upload step and no file size limit from this tool.

What if my JSON has errors?

The tool shows a parse error message so you can correct the syntax and try again.

Does formatting change my data?

No. Only the presentation changes. The keys, values, and structure remain the same.

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