JSON Formatter
Format JSON Online | Newtum JSON Formatter & Validator
✅ Instantly Beautify and Validate Your JSON. Newtum’s Online JSON Formatter and Validator is a free, browser-based tool that lets you format messy or minified JSON, validate your code, and share your work, all without any sign-up required.
A fast, secure, and user-friendly tool designed to:
- Beautify and structure JSON into a readable tree view
- Highlight syntax errors in real-time
- Keep your data safe—everything runs locally in your browser
- Upload and format local JSON files
- Collaborate by sharing formatted JSON links
JSON (JavaScript Object Notation) is a lightweight format for storing and exchanging data. It's human-readable, language-independent, and the most common format for APIs.
It is stored in .json files with MIME type application/json.
🚀 Why Format and Validate JSON?
Most JSON from APIs is minified to save space, making it unreadable. Formatting helps you improve readability, catch errors like missing commas or brackets, and prevent issues when using API data.
💡 How to Format JSON Online?
Paste or upload your JSON, click "Format JSON," and the tool will instantly beautify the code and highlight any syntax errors with detailed explanations.
✨ Key Features at a Glance
- ✅ Beautify JSON from one-liners to pretty-printed view
- ✅ Validate syntax against official JSON standards
- 📁 Upload .json files for formatting
- 🔗 Share or copy formatted JSON with one click
- 📋 Use built-in sample JSON for testing
- 🎨 Toggle themes and editor modes
- 🔐 Secure by design — Your JSON never leaves your device
- 🆓 100% free — no ads
🛠 JSON Formatter Example
{"Id":78912,"Customer":"Jason Sweet","Quantity":1,"Price":18.00}{
"Id": 78912,
"Customer": "Jason Sweet",
"Quantity": 1,
"Price": 18.00
}🔗 Start Formatting JSON Now
Use Newtum’s Online JSON Formatter to save time, avoid mistakes, and produce clean, readable JSON — all in your browser.
Launch JSON Formatter & ValidatorFree and easy to use. Secure, fast, and fully client-side.