Data tools
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Local
JSON Stringify & Unstringify
Turn JSON into a JSON string literal or decode a stringified JSON document locally.
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Structured Data Tree Viewer
Explore JSON, YAML, TOML, and XML as a searchable, collapsible tree in your browser.
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JSON, YAML & CSV Converter
Convert JSON, YAML, and CSV locally with inferred input and explicit output format.
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JSON to Types
Infer TypeScript, Go, or Python data models from a JSON sample locally.
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JSON to JSON Schema
Infer a Draft 2020-12 JSON Schema from representative JSON without uploading it.
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JSON Schema Validator
Validate JSON against a local Draft 2020-12 schema and inspect every failing path.
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JSON Patch & Merge Patch Tester
Apply RFC 6902 JSON Patch or RFC 7396 Merge Patch locally and inspect the resulting document.
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.env.example to Typed Config Loader
Generate a validated TypeScript, Go, or Python configuration loader from .env.example.
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JSON Diff
Compare two JSON documents and see exactly what changed in your browser.
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Text Diff
Compare source, configuration, logs, or arbitrary text with focused line-by-line changes.
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.env File Diff
Compare two .env files by key. Values stay masked until you reveal them, and nothing is uploaded.
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Regex Tester
Test a JavaScript regular expression against your text, with every match, capture group, and replacement shown locally.
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HL7 v2 Capture Inspector
Inspect, filter, and correlate HL7 v2 messages and acknowledgments locally in your browser.
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HL7 v2 Message Diff
Compare two HL7 messages by field, component, repetition, and subcomponent locally.
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Color Picker & Converter
Pick a color or paste any CSS color value and convert it between common, perceptual, and modern color spaces locally.
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Color Contrast Checker
Check WCAG contrast ratios for foreground and background colors, including transparency.
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XPath Tester
Evaluate XPath 1.0 expressions against XML locally and inspect nodes, values, or paths.
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JSONPath Tester
Evaluate JSONPath expressions against local JSON and inspect every matched path and value.
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SemVer Comparator & Range Tester
Compare strict semantic versions and test them against npm-style ranges locally.