JSON Formatter & Validator.
Pretty print, validate, and minify JSON data with exact line/column syntax error detection.
Syntax Diagnostic
Line 1, Col 1Invalid YAML Syntax
Client-Side JSON Formatting, Validation & Pretty Printing
Inspect, format, and validate unformatted or compressed JSON payloads. Our online JSON formatter and validator checks RFC 8259 syntax compliance, isolates missing quotes or trailing commas, and lets you reformat spacing with 2 spaces, 4 spaces, tabs, or one-line minification.
Frequently Asked Questions.
Everything you need to know about YAML to JSON conversion, syntax formatting, and privacy.
How does this JSON formatter and validator work?
Paste your raw or minified JSON to pretty-print with 2-space, 4-space, or tab indentation. If your JSON has syntax errors (such as trailing commas or unquoted keys), the tool pinpoints the exact character offset.
Can I sort JSON object keys alphabetically?
Yes, enable the "Sort Keys" checkbox to reorder all dictionary properties alphabetically for clean diff comparisons.
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Inspect YAML files for syntax errors, tab characters, indentation mismatches, and duplicate keys with instant error suggestions.
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Clean up messy YAML files, standardize 2-space or 4-space indentation, and reformat inconsistent syntax.
YAML Minifier & Flow Compressor
Compress YAML into compact flow-style representations to reduce payload size while maintaining structural validity.
YAML ↔ JSON Semantic Diff Checker
Compare YAML and JSON data structures side-by-side to verify semantic equality and highlight added, removed, or modified values.