What does a JSON formatter do?

It parses your JSON and prints it again with consistent indentation and one key per line, so nested objects and arrays are easy to read. The data itself doesn't change: the same keys, values and order come out.

Why won't my JSON format?

It isn't valid JSON. The most common causes are a trailing comma after the last item, single quotes instead of double quotes, keys without quotes, and comments. JSON allows none of those; the error message points at the first problem.

Are large numbers kept exactly?

Yes. The formatter keeps every number exactly as written, so 12345678901234567890 and 1.50 come out unchanged. Beware in your own code, though: JSON.parse stores numbers as 64-bit floats, so integers above 2^53 - 1 lose precision there.

Is my code or data uploaded anywhere?

No. Every tool runs in your browser, so your code, tokens, keys and files are processed on your device and are not sent to our server or stored. Reloading or closing the page clears them.

Yes. Every tool is free with no sign-up and no limits on use. Clearly labeled ads keep it that way.

Does it work on my phone?

Yes. The tools work in any modern browser on phones, tablets and computers, though large files and long code are easier to handle on a computer.

JSON Formatter

Paste JSON and get it neatly indented and readable.

100% Free
No Sign Up
Works in Your Browser

JSON formatter

Pretty-print and indent JSON

Output

Indent

Sort keys A-Z

JSON input

Formatted JSON

{
  "name": "JustYourDev",
  "version": "1.4.0",
  "private": true,
  "tags": [
    "json",
    "formatter",
    "tools"
  ],
  "author": {
    "name": "Ada Lovelace",
    "email": "ada@example.com"
  },
  "stats": {
    "stars": 4821,
    "rating": 4.9,
    "id": 12345678901234567890
  },
  "features": [
    {
      "id": 1,
      "title": "Format",
      "enabled": true
    },
    {
      "id": 2,
      "title": "Validate",
      "enabled": true
    },
    {
      "id": 3,
      "title": "Minify",
      "enabled": false
    }
  ],
  "homepage": null
}

Object · 22 keys · depth 4367 bytes → 559 bytes

Type: Object
Keys: 22
Values: 29
Depth: 4

Your JSON is processed in your browser. Nothing is uploaded.

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How to use the JSON formatter

Three steps, all in your browser.

1
Paste your input
Type or paste your code or data. Press Sample to try an example.
2
Pick the style
Choose indentation or options. The result updates as you type.
3
Copy the result
Copy the output in one click. Nothing is saved or sent anywhere.

JSON Formatter: what to know

The JSON formatter parses your JSON with a strict parser that follows RFC 8259 and prints it again with consistent indentation, one key per line, so deeply nested API responses, config files and log entries become readable. Choose two spaces, four spaces or tabs to match your project's style.

If the JSON doesn't parse, you get the parser's error and its position instead of a half-formatted result. The usual culprits are a trailing comma after the last item, single quotes, unquoted keys and comments, none of which JSON allows. JSON5 and JSONC (JSON with comments, used by some editors' settings files) are different formats and need their own parsers.

Formatting doesn't change your data: keys keep their order (unless you choose to sort them), strings keep their escapes and numbers are kept exactly as written, so 12345678901234567890 and 1.50 survive. That's worth knowing because JavaScript's own JSON.parse stores numbers as 64-bit floats and loses precision above 2^53 - 1; big IDs are safest as strings.

Popular uses

Reading minified API responses while debugging
Tidying JSON config files before committing them
Making webhook payloads readable in a bug report
Preparing two JSON documents for a clean diff

Tips for the best result

Formatting both sides with the same indentation before comparing them makes a diff show only real changes.
If an error points at the very end of the input, look for a missing closing bracket or brace.
Copy JSON from your browser's network panel with 'Copy response' rather than from the preview, which can be truncated.

Read how JustYourDev works and our privacy details. Code, data and files you use here are processed in your browser and are never sent to our server.