JSON Formatter: Beautify, Minify and Validate

How to use the JSON Formatter & Validator

1. Paste your JSON into the left box — or press Load sample to watch the demo data format itself.
2. Press Beautify: the formatted result appears in the right panel with clean two-space indentation.
3. Read the banner underneath for the verdict — green confirms the JSON is valid and says whether its top level is an object or an array.
4. If the banner is red instead, it names the problem and the exact line and column; fix the JSON there and press Beautify again.
5. Press Minify for a single-line version for production, Validate only to re-check, then Copy the result or Download it as a .json file.

About this tool

JSON is the language of APIs, config files and data exports — and a single missing comma can break all of it. This formatter pretty-prints minified JSON into readable, two-space-indented form, compresses readable JSON back into a single line, and validates with error messages that tell you the position of the problem instead of leaving you to guess. The error messages deserve a word of their own, because they are the feature most people end up needing. Browsers parse JSON strictly: keys must be double-quoted, strings must use double quotes, objects and arrays must balance, and no comma may trail the last item. When your JSON breaks one of those rules, the banner turns red and reports the fault with its line and column, so you can jump straight to it. Most invalid JSON is a thirty-second fix once you know where to look. Developers paste API responses here; analysts paste exported data; students paste the examples that refuse to run. Because the tool runs entirely in your browser, it is equally safe for payloads containing tokens, customer data or anything else you would never paste into a server-side formatter. A good working rhythm: paste, press Beautify, and only trust the output once the banner is green. Beautify when you need to read, compare or debug data; keep a minified copy when the JSON is headed for production, where every saved byte crosses the wire. If a colleague's file will not parse at all, validate it here first — the position in the error message is usually within a character or two of the real mistake. Developers cleaning data often need the opposite trick as well: the strip html tags tool takes markup out of text and leaves the readable words behind. The rules this tool checks against are the format's own: the grammar at json.org is the definition every parser follows. If your file just failed and you want to know why, why is my json invalid walks through the nine mistakes that break almost every file — each shown broken, then fixed.

Worked example

A small order record, pasted as one compressed line and beautified: You paste (one line)

{"order":{"id":1042,"customer":"Ayesha Khan","items":[{"name":"Notebook","qty":2,"price":350},{"name":"Pen","qty":5,"price":60}],"paid":true,"coupon":null}}

You get (beautified)

{
  "order": {
    "id": 1042,
    "customer": "Ayesha Khan",
    "items": [
      {
        "name": "Notebook",
        "qty": 2,
        "price": 350
      },
      {
        "name": "Pen",
        "qty": 5,
        "price": 60
      }
    ],
    "paid": true,
    "coupon": null
  }
}

The green banner confirms the JSON is valid and that its top level is an object. Minified, the same data is a single line of 156 characters — Beautify trades compactness for readability, and Minify takes it straight back whenever you need it small.

Features

• Beautify with clean two-space indentation — objects and arrays nested as deep as your data goes.
• Minify back to a single line, ready for production, embedding or sending.
• Strict validation on every run: trailing commas, single quotes, unquoted keys and unbalanced brackets are all caught.
• Errors in plain English, with the exact line and column of the problem — no guessing and no bisecting your file by hand.
• A Validate-only mode for a quick well-formedness check, plus Load sample for a safe first try.
• Copy the result or download it as a .json file — and because it is all local, payloads with tokens stay on your machine.