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Prettify, format, validate, and minify JSON data with instant local parsing and syntax error diagnostics.
Your sensitive JSON payloads, API tokens, and customer data never leave your browser.
Format with 2 spaces, 4 spaces, or tab indentation to match your codebase conventions.
Instant pinpointing of syntax errors, unclosed brackets, and unexpected tokens with line and column numbers.
Alphabetically sort object keys for deterministic comparisons or minify payloads to reduce file size.
One-click copy with feedback, paste from clipboard, file size statistics, and .json export.
When you use JSON Formatter, your data never leaves your browser. All transformations execute in-memory on your local machine with zero server uploads. Web assets are downloaded to run the tool, but your input data is never transmitted.
Yes. Unlike standard online formatters that send your data to remote backend servers, YoussefLabs processes all JSON entirely inside your browser JavaScript engine. No network requests are made with your data.
Because parsing occurs in memory in your local browser tab, typical files up to several megabytes format near-instantaneously.
Yes. Enabling the "Sort Keys" option recursively sorts keys at all nesting levels of your JSON object.
Encode text to Base64 or decode Base64 back to text in your browser. Unicode-safe, so Arabic, Greek, and emoji work.
Percent-encode or decode a URL component in your browser, using JavaScript's encodeURIComponent rules.
Convert a JSON array of objects to CSV, or CSV back to JSON, in your browser. Quoted fields, commas, and line breaks are handled correctly.