JSON Formatter, Validator & Minifier
Paste any JSON to instantly beautify it with 2-space, 4-space or tab indentation, or minify it down to a single line. The validator flags syntax errors and points to the exact line and column, while live stats show payload size before and after, total key count and nesting depth. Everything runs in your browser — your data never leaves your device.
Your formatted JSON appears here
Paste JSON on the left, then Beautify or Minify.
Input size
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Output size
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Keys Total number of object keys across the whole document.
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Max depth Deepest level of nested objects and arrays.
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How to use
- Paste or type your JSON into the input box on the left.
- Choose an indent width (2 spaces, 4 spaces or tab) and optionally turn on Sort keys.
- Click Beautify to pretty-print, or Minify to compress to one line.
- If the JSON is invalid, read the error message with its line and column to fix it.
- Copy the result or download it as a .json file.
Features
- Beautify with 2-space, 4-space or tab indentation
- Minify JSON to the smallest single-line payload
- Validation with exact line and column of the parse error
- Optional alphabetical key sorting for stable diffs
- Live stats: input/output size, key count and max depth
- 100% client-side — nothing is uploaded, parsed with JSON.parse (never eval)
Frequently asked questions
Is my JSON sent to a server?
No. Formatting, validation and minifying all happen locally in your browser with JavaScript. Your data never leaves your device, so it is safe to paste confidential payloads.
What does "Minify" do?
It removes every unnecessary space and line break, producing the smallest valid JSON on a single line. This is ideal for API request bodies, config values and reducing bandwidth.
How does it find the error line and column?
When JSON.parse rejects your input, the tool reads the character position from the error, then counts newlines up to that point to show the exact line and column where parsing failed.
What does "Sort keys" change?
It reorders the keys of every object alphabetically before formatting. Array element order is always preserved. Sorting keys makes two JSON files easier to compare in a diff.
Can it handle large JSON files?
Yes. Parsing and formatting run on your machine, so size is limited only by your device memory. Key and depth counting uses an iterative walk to handle deeply nested structures.