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.
A developer-focused JSON formatter with keyboard shortcuts, customizable indentation, and features designed for daily coding workflows.
Built specifically for developers who work with JSON daily. This tool combines formatting, validation, minification, and key sorting in a single interface with keyboard shortcuts and customizable settings.
Under the hood, it uses JSON.parse() for validation and JSON.stringify() for formatting — the same native browser methods your JavaScript code uses. This means validation results here match your production runtime behavior exactly.
The tool supports all common developer workflows: format API responses for debugging, minify config for deployment, sort keys for version control, and validate JSON for error detection.
Why developers choose a dedicated JSON tool over IDE plugins:
VS Code requires opening a file, changing the language mode to JSON, and running a format command. This tool is instant — paste, format, copy. No file creation, no project context needed. Ideal for quick one-off tasks like inspecting an API response or cleaning a JSON snippet from chat.
No. This tool uses JSON.parse() which strictly follows RFC 8259 — no comments allowed. For JSONC files (like tsconfig.json), strip comments before pasting or use VS Code's built-in JSONC support.