JSON Formatter

Raw JSON is designed for machines, not human eyes. When APIs and logs dump data as a single compressed line, spotting a missing bracket or a mistyped key can feel like searching for a typo in a novel printed on one continuous strip of paper. This JSON formatter turns that wall of text into a clean, indented structure you can actually read.

The formatter performs three tasks at once. First, it validates your input with the browser\'s native JSON parser. If the document is valid, it then produces two outputs: a pretty-printed version with your chosen indentation, and a minified version with every unnecessary byte removed. Both outputs update live as you type, and each has a one-click copy button.

1. Paste your raw JSON into the input area.
2. Select either 2 or 4 spaces for indentation.
3. Check the status badge to confirm whether the JSON is valid.
4. Copy the formatted or minified output to your clipboard.

If the input is invalid, the tool displays the parser error message. Fix the highlighted issue and the outputs will reappear automatically.

API debugging is the most common reason developers reach for a JSON formatter. REST and GraphQL responses often arrive minified, and formatting them makes it possible to trace nested objects quickly.

Configuration files for tools like package.json, tsconfig.json, and CI pipelines are easier to review when indented consistently. Formatting before a commit keeps diffs clean and readable.

Teaching and documentation benefit from formatted samples. A well-indented example helps students see the relationship between objects, arrays, keys, and values at a glance.

Production payloads should be minified. The minified output reduces transfer size and parsing time for clients without changing the underlying data.

Imagine you receive this minified API response: {"user":{"id":42,"name":"Ada"},"roles":["admin","editor"]}. Pasting it into the formatter with 2-space indentation produces:

{
  "user": {
    "id": 42,
    "name": "Ada"
  },
  "roles": [
    "admin",
    "editor"
  ]
}

The minified copy remains {"user":{"id":42,"name":"Ada"},"roles":["admin","editor"]}, ready to be sent back across the wire.

• Always use double quotes for strings and object keys.
• Remove trailing commas before sharing JSON with strict parsers.
• Use null instead of undefined for empty values.
• Keep the original formatted file in version control, not the minified one.
• Validate large payloads before sending them to production APIs.