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JSON Formatter

Format, minify, validate, and inspect JSON safely in the browser.

Runs locally in your browser. No JSON is uploaded.

Input
Valid161 bytes
{
  "name": "CodeSphere",
  "features": [
    "format",
    "validate",
    "minify"
  ],
  "privacy": {
    "runsLocally": true,
    "serverRoundTrips": 0
  }
}

About the JSON Formatter

Paste raw JSON to validate it, pretty-print it with two spaces, four spaces, or tabs, minify it for transport, recursively sort object keys, or inspect nested payloads in a collapsible tree. Everything runs in the browser after the page loads.

How the result is produced

The formatter uses the browser's JSON parser, then applies the selected indentation, minification, or recursive key-sorting operation. The tree view walks the parsed value so objects and arrays can be inspected without uploading the payload.

Example: For an API response such as {"user":{"id":7,"name":"Asha"}}, pretty-printing makes the nesting readable while minification produces a compact transport form.

Limitations and review notes

The input must be standard JSON: comments, trailing commas, and unquoted keys are not accepted. Valid JSON is not the same as a valid API schema, so use the service's schema or contract checks before production use.

How to use it

  1. 1. Paste JSON into the input pane or open a small shared snippet URL.
  2. 2. Pick indentation and optionally enable recursive key sorting.
  3. 3. Switch between formatted, minified, and tree output views.
  4. 4. Copy the result or download it as a JSON file.

FAQ

Does the JSON formatter upload my data?

No. Formatting, validation, minification, sorting, and tree rendering run entirely in your browser after the page loads.

Can it find the line and column of JSON syntax errors?

When the browser parser reports an error position, CodeSphere converts it into a line and column so malformed payloads are easier to fix.

Can I sort object keys?

Yes. Enable Sort keys to recursively sort object keys while preserving array order.

Can I share formatted JSON in the URL?

Small JSON snippets can restore from the input query parameter. Large payloads stay out of the URL to avoid accidental sharing.

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