DevKitBase
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JSON beautifier and formatter that stays on your device

Minified API responses are fine for machines and painful for humans. Paste a blob, get 2-space (or 4-space) pretty JSON with clear errors if the payload is broken. Same page covers the “formatter / beautifier / prettify” searches — one tool, not three thin clones.

Indent
chars: 70
Input
Output

When to use

Front-end and API folks paste a minified response and need readable structure before they dig into a bug. Also handy before a PR when a config blob got squashed onto one line.

Examples

Input
{"a":1,"b":[2,3]}
Output
{
  "a": 1,
  "b": [
    2,
    3
  ]
}
Input
{"product":"DevKitBase","local":true}
Output
{
  "product": "DevKitBase",
  "local": true
}
Same values — only whitespace between tokens changes.

How it works

Parses with JSON.parse, then JSON.stringify with 2- or 4-space indent. It does not “fix” invalid JSON, rewrite keys, or talk to a server.

Common pitfalls

  • Trailing commas and single-quoted keys fail standard JSON.parse.
  • Comments (// or /* */) are not JSON — strip them first.
  • Huge one-line payloads can freeze the tab; prefer splitting or streaming elsewhere.

How this differs

Formatter makes valid JSON readable. JSON Validator is for pass/fail + error position. JSON Minify is the reverse (strip whitespace). Schema Validator checks shape, not pretty-print.

FAQ

Is this the same as a JSON validator?
Formatting needs valid JSON first; use the validator page if you only need pass/fail + error detail.
Does my JSON leave the browser?
No. Parsing runs locally.
Can I minify after beautifying?
Yes — use JSON Minify, or collapse indent to 0 here if the UI exposes it.
What about trailing commas?
Standard `JSON.parse` rejects them; fix the source or strip before paste.

Related tools

Runs in your browser. Nothing is uploaded. Not a security product —hashes and JWT decode are for debugging, not password storage or auth advice.