What's the difference between beautify and minify?

Beautify adds indentation and line breaks for readability, while minify strips all unnecessary whitespace to produce the smallest possible output — useful before storing or transmitting JSON.

How do I find what's wrong with invalid JSON?

Paste it into the formatter and it will point to the exact line and character where parsing failed, with a description of the problem such as a missing comma or trailing quote.

Byte-Kit

All tools

JSON Formatter & Validator

Clean up, validate, beautify, or minify JSON without uploading it anywhere.

Valid JSON Structure

Buffer In224 bytes

Buffer Out240 bytes

{
  "protocol": "Byte-Kit/v1",
  "isolated": true,
  "runtime": "node:v8-browser",
  "limits": {
    "maxPayloadBytes": 1048576,
    "corsPolicy": "strict-same-origin"
  },
  "modules": [
    "crypto",
    "encoding",
    "css-parser"
  ]
}

About this tool

The JSON Formatter validates, beautifies, and minifies JSON entirely in your browser. Paste minified API responses to make them readable, or compress formatted JSON before sending it over the wire. Invalid JSON is flagged with a precise error location so you can fix it fast.

Because everything runs locally, you can safely format JSON containing API keys, tokens, or personal data without sending it to a server. The formatter handles deeply nested objects, arrays, unicode escapes, and large payloads without lag.

How to use

1Paste your JSON into the left input panel.
2The tool validates it instantly — a green badge means valid, red means malformed.
3Click Beautify for readable 2-space formatting, or Minify for compact output.
4Use the copy button to grab the result.

Frequently asked questions

No. All parsing and formatting happens locally in your browser via JavaScript. Your data never leaves your device, so it's safe to use with sensitive payloads.

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