JSON Formatter
Format & Validate JSON
Format, validate, minify, and explore JSON structure instantly. 100% private — your data never leaves your browser.
Indent:
Input JSON
Formatted Output
Paste JSON to format and validate
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Get Started Free →About the SavirOS JSON Formatter
The SavirOS JSON Formatter & Validator is a free, browser-based tool for formatting, validating, and minifying JSON. Unlike server-based formatters that send your data to the cloud, this tool processes everything locally in your browser, ensuring your data stays private. Whether you're a developer debugging API responses, working with configuration files, or cleaning up data exports, the JSON Formatter makes it easy to read, validate, and optimize JSON instantly.
The tool includes a collapsible tree view for visualizing JSON structure, detailed error messages with line numbers for debugging validation issues, statistics showing file size (original vs. minified), depth, and key count, and one-click copy or download functionality. With customizable indentation (2 spaces, 4 spaces, or tabs), you can format JSON exactly how you need it.
Key Features
JSON Formatter: Paste messy, minified, or poorly formatted JSON and click Format to apply consistent indentation. Choose your preferred indent style — 2 spaces (compact), 4 spaces (standard), or tabs.
JSON Validator: Automatically validates JSON syntax as you type or paste. Displays detailed error messages including the exact position where the syntax breaks, making it fast to fix problems.
JSON Minifier: Remove all whitespace, newlines, and unnecessary characters to reduce JSON file size for APIs, web services, and production use.
Tree View: Visualize JSON structure as a collapsible tree. Expand and collapse objects and arrays to navigate complex nested data. Type-based color coding helps distinguish strings (green), numbers (blue), booleans (amber), and null values (gray).
Statistics: See key metrics including original file size, minified file size, maximum depth, and total key count. Useful for understanding the complexity of your JSON.
Copy & Download: Copy formatted JSON to your clipboard with one click, or download it as a .json file for use in your projects.
Why Use SavirOS JSON Formatter?
Many JSON formatters are bloated with ads, require signups, or send your data to third-party servers. The SavirOS JSON Formatter is different: it's lightweight, ad-free, completely free, requires no account, and runs 100% in your browser. Your JSON never touches a server. This makes it ideal for formatting sensitive data, API responses, configuration files, and any JSON you want to keep private.
The tool supports very large JSON files gracefully, with a warning if you paste something unusually large. The tree view is perfect for exploring the structure of complex APIs (like AWS responses, Stripe webhooks, or GraphQL results), while the minifier is essential for production JSON optimization.
The SavirOS JSON Formatter is part of a suite of 28+ free productivity tools built for developers and professionals. Related tools include the Meeting Link Decoder for parsing meeting URLs and the Event Creator for generating calendar events.