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CrateX.app

JSON Formatter & Validator

JSON Formatter & Validator lets you format, validate, and minify JSON online, with error locations, key sorting, and indentation control for API debugging, config editing, log inspection, and code review.

JSON Input

Character

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JSON Formatter & Validator

Quick Start

1
Enter/Paste: type or paste JSON into the input area
2
Real-time validation: checks syntax as you type; the error line is highlighted, and you can hover or tap to view line/column details
3
Format: click ‘Format’ to pretty-print and replace the input with the result
4
Minify: click ‘Minify’ to remove whitespace/newlines; replaces the input
5
Copy: click the copy button below to copy the current content

Common Scenarios

API debugging

quickly check whether returned JSON is valid and turn it into something easier to read.

Log inspection

format JSON snippets from logs to spot bracket, quote, and field-structure issues.

Configuration editing

clean up JSON structure, indentation, key order, and nested layout before saving.

Code review

include clearer JSON examples so teammates can inspect payloads and config changes faster.

Pre-commit check

normalize pasted JSON formatting and indentation to reduce style noise before commit.

Formatting Parameters & Actions

Indent size: use the dropdown next to the buttons to choose Tab/2/4/8
Sort: click ‘Sort’ to alphabetically sort object keys (semantics unchanged); copy/submit uses current content

Usage Advice

Escapes: use valid escapes in strings (e.g., " and \ +)
Consistency: agree on indentation, key order, and schema within the team
Backup before sorting: sorting changes key order and cannot be auto-reverted; copy a backup first
Start with the highlighted error line, then hover or tap to view 'Line X, Column Y' and inspect nearby brackets, quotes, and commas
Minify then format to surface extra commas or mismatched quotes

Limitations & Compatibility

No comments: // and /* */ are not standard JSON (use JSON5/JSONC tools)
No single quotes: 'text' is not a valid JSON string
No trailing commas: {"a":1,} or [1,] is invalid
Large JSON: to keep the page responsive, consider splitting; very deep/huge structures may be simplified

Privacy & Security

All processing happens locally in your browser. You can replace, clear, and re-run the current content at any time.

FAQ

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