DevSuite
Input
Output
{
  "app": "DevSuite",
  "version": "2.0.0",
  "author": "Txproof",
  "features": [
    "json",
    "cron",
    "base64"
  ],
  "config": {
    "theme": "dark",
    "clientSide": true,
    "dataLeaks": 0
  },
  "active": true
}

Free Online JSON Formatter & Validator

Format, validate, and minify JSON directly in your browser. DevSuite helps you turn compact or difficult-to-read JSON into a structured, readable format and quickly identify invalid JSON syntax.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight text format commonly used to exchange structured data between applications, APIs, and services. Objects use key-value pairs, while arrays contain ordered values. Valid JSON uses double-quoted property names and supports strings, numbers, booleans, null, objects, and arrays.

How to format JSON

Paste your JSON into the editor above and select Format. The formatter parses the input and produces an indented, syntax-highlighted version. Use Minify when you need compact JSON with unnecessary whitespace removed.

Common JSON errors

Frequent problems include missing commas, unmatched braces or brackets, single quotes instead of double quotes, trailing commas, and unquoted property names. The validator reports parsing errors so you can locate and correct invalid syntax before sending JSON to an API or application.

Is my JSON uploaded?

DevSuite's JSON formatting engine runs in your browser. Tool input is processed locally and is not uploaded to DevSuite servers. The website may still make separate requests for services such as analytics or advertising; those services are independent of the JSON formatter's processing.

When to use a JSON formatter