This is a free, real-time JSON formatter and validator that runs 100% in your browser. No data is sent to any server. It supports formatting (beautifying), minifying, sorting keys alphabetically, and real-time validation with line-accurate error messages.
JSON.parse() converts your text into an in-memory JavaScript object, then JSON.stringify() renders it back with proper indentation. This also validates the JSON as a side effect " any syntax errors are caught and displayed with the exact character position.
All processing is done entirely in your browser's memory using JavaScript. No data is sent to any server. When you close this tab, the data is gone. This makes it safe to use with API keys, tokens, or private configuration files.
It recursively sorts all object keys alphabetically throughout the entire JSON structure. Useful for comparing two JSON objects for differences or enforcing consistent key ordering in config files.
Minifying removes all whitespace, newlines, and indentation from valid JSON. The result is functionally identical but smaller " useful for reducing payload size in HTTP API responses or configuration files.
Remove all unnecessary whitespace from JSON to create the smallest possible payload. Ideal for optimizing API responses and config files.
JSON minification removes all non-essential whitespace — spaces, tabs, newlines, and carriage returns — from valid JSON data. The result is functionally identical but significantly smaller, reducing bandwidth usage and improving load times.
The minification process works by parsing the JSON with JSON.parse() and then re-serializing it with JSON.stringify(data) (no indentation argument). This ensures only data-carrying characters remain in the output.
This is the opposite of prettifying. While prettified JSON is for human reading, minified JSON is for machine consumption — HTTP responses, localStorage, configuration payloads, and embedded data attributes.
When to minify your JSON:
No. Minification only removes whitespace characters (spaces, tabs, newlines). All keys, values, arrays, and objects remain identical. JSON.parse() produces the same result from both minified and prettified versions.
Typically 40-60% smaller than 2-space indented JSON. The exact reduction depends on the nesting depth — deeply nested JSON with many indent levels sees the largest reduction.
Yes, for production APIs. Most web frameworks minify JSON by default. If yours doesn't, minifying can significantly reduce bandwidth, especially for mobile clients. Combine with gzip compression for best results.
Minification removes whitespace from the text. Compression (like gzip or Brotli) encodes the text using algorithms that find repeated patterns. They stack — minify first, then compress. Together they can reduce a JSON payload by 90%+.
No. JSON does not support comments per the RFC 8259 specification. If your input has // or /* */ comments, you need to strip them before minifying.