JSON Minify & Compress
Minify, beautify and validate JSON data instantly. Remove all whitespace to reduce file size, format for readability, or validate JSON syntax — entirely in your browser.
Why Use JSON Minify?
Professional JSON processing with validation, formatting, and optimization — all running privately in your browser.
JSON Minification
Remove all whitespace, line breaks, and indentation to produce the smallest possible JSON. Ideal for APIs, config files, and production data transfers.
JSON Beautifier
Format compact or minified JSON with clean indentation (2 spaces, 4 spaces, or tabs) for easy reading, debugging, and editing.
JSON Validator
Validate JSON syntax instantly. Errors are reported with exact location so you can quickly find and fix any malformed JSON.
Sort Object Keys
Alphabetically sort all object keys in your JSON output. Great for comparing JSON objects, creating deterministic output, and reducing git diff noise.
Fix Trailing Commas
Automatically removes trailing commas before closing brackets and braces — common in hand-edited JSON and JavaScript object literals.
Strip JS Comments
Remove JavaScript-style // and /* */ comments from JSONC or JSON5-style files before parsing.
Unicode Escaping
Optionally convert non-ASCII characters to safe \uXXXX escape sequences for maximum compatibility with all parsers and systems.
100% Private
All processing happens entirely in your browser. Your JSON is never sent to any server, never logged, never stored. Safe for sensitive and proprietary data.
Process JSON in 5 Steps
Minify, beautify, or validate your JSON in seconds with no installation or sign-up required.
Paste Your JSON
Copy your JSON data from your API response, config file, or code editor and paste it into the JSON Source input area.
Select Output Mode
Choose Minify to compress, Beautify to format with readable indentation, or Validate to check for syntax errors without modifying the data.
Configure Options
Open advanced options to sort keys, remove duplicates, fix trailing commas, strip JS comments, or escape unicode characters.
Click Process JSON
Hit the Process JSON button. The tool processes your data instantly in the browser — no upload, no waiting, no server required.
Copy the Result
Use the Copy JSON button to copy the output to your clipboard, then paste it wherever you need — your editor, API client, or file.
JSON Minifier & Beautifier — Process JSON Data Online
JSON Minify is a free, fast, and browser-based tool for processing JSON data. Whether you're compressing API payloads, formatting config files for readability, or debugging malformed JSON, JSON Minify gives you the right output instantly — with zero data sent to any server.
What is JSON Minification?
JSON (JavaScript Object Notation) minification removes all unnecessary whitespace — spaces, tabs, newlines — from JSON data without changing its structure or values. A minified JSON string is functionally identical to the original formatted version but can be significantly smaller in file size, which translates to faster API responses, lower bandwidth usage, and improved application performance.
Modern performance tools like Google PageSpeed Insights and web auditors recommend serving minified JSON for APIs and data endpoints. Minifying JSON is standard practice in production environments, especially for high-traffic APIs where every byte counts.
JSON Tool Features
JSON Minify provides a complete suite of JSON processing tools in one place:
- Minify — remove all whitespace
- Beautify — format with 2/4 spaces or tabs
- Validate — syntax check with error reporting
- Sort object keys alphabetically
- Remove duplicate object keys
- Strip // and /* */ comments (JSONC)
- Fix trailing commas automatically
- Remove null value entries
- Escape unicode to \uXXXX
- Instant size reduction stats
- One-click copy to clipboard
- 100% browser-based — completely private
JSON vs JSONC vs JSON5
Standard JSON (RFC 8259) does not support comments or trailing commas. However many developers use JSONC (JSON with Comments, used by VS Code settings) or JSON5 which add these features. JSON Minify's "Strip JS Comments" and "Fix Trailing Commas" options allow you to process JSONC and JSON5 files by cleaning them up before parsing.
JSON Performance Best Practices
For production APIs and web applications, always serve minified JSON. Even a modest 30% reduction in JSON payload size can meaningfully improve Time to First Byte (TTFB) and reduce bandwidth costs at scale. Pair minified JSON with GZIP or Brotli compression on your server for maximum efficiency — compressed minified JSON is typically 70–90% smaller than uncompressed formatted JSON.
Frequently Asked Questions
Common questions about JSON minification, formatting, validation, and using the JSON Minify tool.
JSON minification removes all unnecessary whitespace — spaces, tabs, and newlines — from JSON data without changing its structure or values. The result is a compact single-line JSON string that is functionally identical but occupies significantly less storage and bandwidth, making it ideal for APIs and production data transfers.
JSON Minify can typically reduce JSON file size by 15–60% depending on how much whitespace and indentation the original contains. Heavily formatted JSON with deep nesting and 4-space indentation sees the greatest reduction. When combined with GZIP compression, total savings of 70–85% are common.
Yes. JSON Minify validates your JSON syntax before processing using the browser's native JSON.parse(). If any syntax errors are found, they are displayed with an error message indicating what went wrong, so you can quickly locate and fix the issue in your input.
Minify removes all whitespace to produce the smallest possible single-line output — ideal for APIs, config files, and production data. Beautify (also called pretty-print or format) adds structured indentation and line breaks for human readability — ideal for debugging, editing, and reviewing JSON data.
Absolutely. All JSON processing happens entirely in your browser using JavaScript. Your data is never sent to any server, never logged, and never stored anywhere. You can safely use this tool with confidential API responses, auth tokens, database exports, and any sensitive data. The tool even works offline once the page has loaded.
Sort Keys alphabetically reorders all object property keys throughout the entire JSON structure. This is useful for comparing two JSON objects, producing deterministic output for testing or hashing, reducing git diff noise in JSON config files, and making large JSON structures easier to scan and navigate.
Yes. Enable the "Strip JS Comments" option to remove single-line (//) and multi-line (/* */) comments before parsing. Also enable "Fix Trailing Commas" to handle trailing commas that JSONC and JSON5 allow but standard JSON does not. This makes JSON Minify compatible with VS Code settings.json and other JSONC files.
JSON Minify follows RFC 8259 (the official JSON standard) for its output. Input parsing uses the browser's native JSON.parse() engine which is fully RFC-compliant. Optional preprocessing steps (comment stripping, trailing comma removal) allow importing JSONC and JSON5 files that extend the standard.