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JSON Formatter

Developer

Free JSON formatter to beautify with two or four spaces, or minify whitespace - invalid JSON shows a parser error so you can fix an API response or config before copying it back.

0
0
JSON
Formatted
{
  "name": "John",
  "age": 30,
  "city": "New York"
}

Beautify JSON with 2 or 4 spaces, or minify it, in the browser. Caps: 100,000 characters, 10,000 values, 64 nesting levels.

See more about the JSON Formatter

Parser errors are shown as text; for a tree view use JSON Tree View.

Examples

Beautify a compressed payload

Input: {"ok":true,"items":[1,2]}
Format (2 spaces):
{
  "ok": true,
  "items": [1, 2]
}

Use double-quoted keys and strings. Comments and trailing commas are invalid JSON. For a collapsible tree, open JSON Tree View after formatting.

Minify before shipping

Input: { "ok": true, "items": [1, 2] }
Minify: {"ok":true,"items":[1,2]}

Limits: 100,000 characters, 10,000 values and 64 nesting levels. Unsafe integers are rejected; quote large IDs as strings.

Key features

  • Beautify with 2 or 4 spaces
  • Minify for compact payloads
  • Parser errors without uploading

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Quick answers for JSON Formatter

Does it fix invalid JSON?
No. It shows the parser error. Correct invalid input before formatting; comments and trailing commas are rejected.
What changes between Format and Minify?
Format (beautify) adds two or four spaces of indentation. Minify removes insignificant whitespace, keeping spaces inside strings.
What limits apply?
Input is limited to 100,000 characters, 10,000 values and 64 nesting levels. Unsafe integers are rejected; quote large identifiers to preserve their digits.
Does my JSON leave the browser?
No. Formatting and minifying run locally. For a collapsible tree after you fix the JSON, use JSON Tree View.