What does a JSON formatter do?

It parses valid JSON and writes it back with indentation so objects, arrays, and nested fields are easier to read.

Yes. Minify removes optional whitespace and line breaks after the JSON has been parsed successfully.

Does it support JSON5 or comments?

No. This tool follows standard JSON through JSON.parse, so comments, trailing commas, and unquoted keys are rejected.

Is the JSON uploaded?

The tool runs in your browser. Still avoid sensitive payloads on shared devices or browsers with untrusted extensions.

JSON Formatter

Format, validate, and minify JSON in your browser with indentation controls, syntax errors, and simple structure stats.

Indent:

Paste JSON

Format, validate, and minify JSON

Use this JSON formatter to paste a raw API response, webhook payload, config fragment, or minified JSON string and turn it into readable output.

Pretty-print JSON with 2 spaces, 4 spaces, or tabs.
Validate syntax with the browser's standard JSON.parse behavior.
Minify valid JSON back to a compact single-line string.
Check key count, nesting depth, and byte size after parsing.

Standard JSON parsing

The formatter uses standard `JSON.parse` and `JSON.stringify`. That means JSON5, JSONC comments, trailing commas, unquoted keys, and undefined values are not accepted as standard JSON.

f or ma tt e d = J S O N . s t r in g i f y (J S O N . p a r se (in p u t), n u l l, s p a ce)

space is 2 spaces, 4 spaces, or a tab character.

Valid JSON syntax does not prove that the payload matches a specific API schema. It only proves that the text can be parsed as JSON.

Browser-side privacy note

Formatting runs in the browser through built-in JSON APIs. Avoid pasting secrets, tokens, credentials, or personal data on shared devices because clipboard history, extensions, and local logs may still expose them.