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Format JSON Online

Format JSON online in one click. Paste messy or minified JSON and get clean, indented, readable output instantly. Free, private, runs in your browser.

Part of the free JSON Formatter & Validator. Runs in your browser — nothing is uploaded.

Format JSON Online

Minified JSON is nearly impossible to read. Paste it below and the formatter re-indents every object and array so you can see the structure at a glance. Nothing is uploaded: formatting runs entirely in your browser tab.

Worked example: Minified one-liner to readable JSON

Input (minified)

{"status":"ok","page":1,"results":[{"id":101,"name":"Ada","roles":["admin","dev"]},{"id":102,"name":"Linus","roles":["dev"]}],"next":null}

Formatted output

{
  "status": "ok",
  "page": 1,
  "results": [
    {
      "id": 101,
      "name": "Ada",
      "roles": [
        "admin",
        "dev"
      ]
    },
    {
      "id": 102,
      "name": "Linus",
      "roles": [
        "dev"
      ]
    }
  ],
  "next": null
}

Practical tip

Choose 2 spaces for most JavaScript projects and 4 spaces for Python and Java style guides. Consistent indentation keeps Git diffs small.

How to use this JSON Formatter

  1. 1Use the live tool above — it runs entirely in your browser and never uploads your data.
  2. 2Paste the sample from the worked example, or use your own input.
  3. 3Copy the result, then adapt the same steps in your editor, script, or pipeline.

Format JSON Online FAQs

Is it safe to format JSON with private data here?

Yes. The formatter runs locally in your browser and never sends your JSON to a server, so API keys and customer records stay on your machine.

Does formatting change my data?

No. Formatting only changes whitespace. Keys, values, order and types stay exactly the same.

More JSON Formatter pages

Open the full JSON Formatter tool →