Text Diff Checker
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Compare two pieces of text and see line-by-line additions and deletions, like a Git diff. Highlights every change.
JSON Formatter & Validator
★★★★★★★★★★5.0(0 ratings)👁 2❤ 0
Format, beautify, validate, and minify JSON. Highlights syntax errors with line and column information.
JSON Formatter & Validator
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About This Tool
What This Tool Does
- Pretty-print — formats compact JSON with proper indentation
- Validate — confirms your JSON is valid; shows the error position if not
- Minify — strips all whitespace for compact transmission
- Tree size — shows total characters and approximate depth
Common JSON Errors
- Trailing commas (
{"a": 1,}) — invalid in JSON - Single quotes — JSON requires double quotes
- Unquoted keys — keys must be strings in double quotes
- JavaScript-style comments (// or /* */) — not allowed in JSON
- Multiline strings without escaped newlines
Frequently Asked Questions
Why is my JSON failing validation?
The most common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or JavaScript comments. The tool shows the exact line and column of the error so you can find it fast.
Can it handle very large JSON files?
Yes u2014 the tool runs in your browser using the native JSON.parse, which is fast and memory-efficient. Files up to several MB process instantly. Multi-hundred-MB files may freeze the tab; for those use a streaming parser like jq.
What's the difference between minify and format?
Format adds indentation and line breaks for readability u2014 best for development and debugging. Minify strips all whitespace for compact transmission u2014 best for production payloads where every byte counts.