JSON Formatter and Validator: Beautify and Minify JSON Online

Paste JSON to validate it, pretty print it with the indent you choose, or minify it. Errors show what is wrong. Runs in your browser.

Paste your JSON and press Beautify to indent it, or Minify to remove the extra spaces. If the JSON is not valid, the message tells you what is wrong. Nothing leaves your browser.

What it does

• Checks that the JSON is valid.
• Indents objects and arrays.
• Minify removes all extra spaces.
• Does not change keys, values or their order.

Example

{"name":"localconfig","tags":["config","tools"],"nested":{"a":1,"b":[1,2,3]}}

{
  "name": "localconfig",
  "tags": ["config", "tools"],
  "nested": { "a": 1, "b": [1, 2, 3] }
}

Frequently asked questions

Why does my JSON fail?

The usual causes are a trailing comma, single quotes instead of double quotes, a missing quote around a key, or a comment. JSON allows none of these.

What is the difference between Format and Minify?

Format adds line breaks and indentation so people can read it. Minify removes the extra spaces so the file is smaller.

Is my data uploaded?

No. The check runs in your browser and nothing is sent to this site.

Runs in your browser. Nothing you type is sent to this site. Updated 2026-10-11.

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