AIStacker
Formatter

JSON Formatter

Beautify, minify, validate and sort JSON instantly in your browser.

#json#formatter#beautify#minify#validator#pretty-print#sort-keys

JSON Formatter & Validator

Paste your JSON on the left, then format, minify, or sort keys. Designed for developers who need a fast, reliable JSON workspace.

Mode
JSON inputPaste raw JSON or a JavaScript-style object.
Formatted outputOutput is read-only. Use copy to reuse it elsewhere.
Coming next: JSON tree view, diff, and AI-powered explanations. This formatter is built to grow with aistacker.dev.

What is JSON Formatter?

JSON Formatter is an essential utility for developers, data analysts, and system administrators who work with JavaScript Object Notation. APIs often return minified JSON to save bandwidth, making it nearly impossible to read or debug. This tool transforms dense strings into a human-readable, hierarchical structure with proper indentation and syntax highlighting.

How to use JSON Formatter

Paste your raw, minified, or messy JSON into the left panel. Choose Pretty or Minify mode, optionally enable key sorting, then click Format JSON (or press ⌘/Ctrl+Enter). The validated output appears on the right, ready to copy.

Example

// Input:
{"id":1,"name":"AIStacker"}

// Pretty output:
{
  "id": 1,
  "name": "AIStacker"
}

Common use cases

1. Debugging REST API responses.

2. Formatting config files (package.json, tsconfig.json).

3. Validating JSON syntax before committing.

4. Minifying JSON to reduce payload size.

5. Sorting keys alphabetically for diff readability.

Frequently asked questions

Is my JSON data secure?▾
Yes. All processing happens entirely in your browser using JavaScript. No data is ever sent to a server.
Can it handle invalid JSON?▾
Yes — a clear parse error message is shown inline so you can pinpoint the problem immediately.
Does it support JSON5 or JavaScript objects?▾
The parser uses the standard JSON.parse(), so JSON5 and unquoted keys are not supported. Convert to standard JSON first.