JSON Formatter, Minifier & Validator
Configure indentation tabs, compress payloads, auto-fix structural syntax errors, and convert to YAML
A versatile developer utility to format nested JSON schemas, minify codebases, debug syntax boundaries with specific line hints, and auto-fix minor glitches like trailing commas or unquoted keys.
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
How to use
- Paste your raw JSON payload inside the input editor.
- Adjust the indentation spacing preferences and trigger pretty formatting, minification, or YAML conversions.
- Use the Auto-Fix engine to clean comments and recover slightly broken JSON structures automatically.
FAQ
- What syntax glitches can the Auto-Fix engine resolve?
- It fixes standard violations such as single/block comments, unquoted object keys, and trailing commas by utilizing a loose JavaScript parser evaluation sandbox.
- Is there any size limit or security risk?
- No data is sent over the network; everything is processed safely inside your local browser. Large JSON strings (up to several megabytes) can be formatted instantaneously.
- Can very large JSON files be processed without slowing down?
- JSON documents with tens of thousands of lines format and minify normally as long as the browser's parser can handle them. For files much larger than that — tens of megabytes or more — processing speed depends on your browser's available memory and may slow down.