JSON Formatter & Validator
No data is sent to any server. Everything runs locally in your browser.
What is a JSON Formatter?
A JSON formatter (also called a JSON beautifier or JSON pretty printer) takes raw, compact, or unformatted JSON and restructures it with proper indentation and line breaks so it becomes easy to read and understand. Whether you are debugging an API response, reviewing a config file, or inspecting data from a third-party service, a formatted JSON view saves significant time.
This tool also acts as a JSON validator — it instantly detects syntax errors and shows you exactly what went wrong, so you can fix issues without guessing.
Why Use This JSON Formatter?
- 100% free — no account, no limits, no paywall.
- Private — all processing runs in your browser. Your JSON never leaves your device.
- Fast — instant results, even for large payloads.
- Flexible input — paste text, upload a
.jsonfile, or load directly from a URL. - Multiple output modes — beautify with 2 or 4 space indent, or minify to a single line.
- Sort keys — alphabetically reorder all object keys at every level for easy comparison.
Features
Beautify / Pretty Print
Adds indentation (2 or 4 spaces) and line breaks for readability.
Minify
Strips all whitespace to produce the smallest possible JSON output.
Validate
Checks JSON syntax and shows clear error messages with the exact issue.
Sort Keys
Sorts all object keys alphabetically at every nesting level.
Upload File
Load a local .json file directly from your device.
Load from URL
Fetch and format a JSON API response directly by URL.
Copy & Download
Copy output to clipboard or save it as a .json file.
Client-side Only
No data is ever sent to a server. Works offline after first load.
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data format used to exchange data between applications. It is human-readable and widely supported across all programming languages and platforms.
Is my data safe?
Yes. All formatting, validation, and processing happens entirely in your browser using JavaScript. Nothing is sent to any server. It is safe to paste sensitive or confidential JSON here.
What is the difference between Beautify and Minify?
Beautify adds indentation and line breaks to make JSON easy to read and debug. Minify removes all whitespace to produce the most compact output — useful for reducing payload size when sending JSON over a network.
What causes a JSON validation error?
The most common causes are: missing or extra commas, unquoted object keys, single quotes instead of double quotes, trailing commas after the last item, and mismatched braces {} or brackets [].
Can I load JSON from an API URL?
Yes. Paste the URL into the URL input field and click Load URL. The tool fetches the response and loads it into the editor. Note that the API must allow cross-origin requests (CORS) for this to work from a browser.
What does Sort Keys do?
Sort Keys reorders all object properties alphabetically at every nesting level. This makes it easy to compare two JSON objects side by side or to spot missing or extra fields.