SYS.01 · DevStudio registry

Every tool, one registry.

13 live today, 49 more mapped in a taxonomy built for a thousand. Everything runs in your browser — your input never leaves the page. Press ⌘K anywhere to jump to a tool.

/json-formatterAvailableJSON Formatter & ValidatorFormat, validate and minify JSON with exact error positions.
/base64-encoderAvailableBase64 Encoder / DecoderEncode and decode Base64 both ways, safely across Unicode.
/url-encoderAvailableURL Encoder / DecoderPercent-encode and decode URL components without guesswork.
/uuid-generatorAvailableUUID GeneratorGenerate and validate v4 UUIDs, one or a hundred at a time.
/jwt-decoderAvailableJWT DecoderInspect a token's header, payload and expiry — decoding, never verifying.
/hash-generatorAvailableHash GeneratorSHA-1, SHA-256 and SHA-512 digests computed in your browser.
/timestamp-converterAvailableTimestamp ConverterUnix seconds, milliseconds, ISO 8601 and relative time — one input, every format.
/case-converterAvailableCase ConvertercamelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE and Title Case.
/slug-generatorAvailableSlug GeneratorTurn any heading into a clean, URL-safe slug.
/regex-testerAvailableRegex TesterRun patterns against text with match ranges, capture groups and runaway guards.
/color-converterAvailableColor ConverterHEX, RGB and HSL, converted precisely in every direction.
/lorem-ipsumAvailableLorem Ipsum GeneratorDeterministic placeholder text — same seed, same output, reviewable diffs.
/cron-describerAvailableCron DescriberPaste a cron expression, read it back in plain language.
/yaml-formatterComing soonYAML FormatterFormat and validate YAML with anchors intact.
/xml-formatterComing soonXML FormatterPretty-print and validate XML.
/sql-formatterComing soonSQL FormatterReadable SQL across dialects.
/html-formatterComing soonHTML FormatterTidy markup without breaking whitespace-sensitive tags.
/css-formatterComing soonCSS FormatterFormat and organize stylesheets.
/markdown-previewComing soonMarkdown PreviewLive-render Markdown as you type.
/json-to-yamlComing soonJSON ⇄ YAMLConvert between JSON and YAML losslessly.
/json-to-csvComing soonJSON ⇄ CSVFlatten JSON to CSV and back.
/json-to-typescriptComing soonJSON → TypeScriptInfer TypeScript types from JSON samples.
/number-base-converterComing soonNumber Base ConverterBinary, octal, decimal and hex in one view.
/unit-converterComing soonUnit ConverterBytes, durations, lengths and more.
/html-entitiesComing soonHTML Entity EncoderEscape and unescape HTML entities.
/hex-encoderComing soonHex Encoder / DecoderText to hex bytes and back.
/qr-generatorComing soonQR Code GeneratorGenerate QR codes from text or URLs.
/password-generatorComing soonPassword GeneratorStrong passwords with tunable character sets.
/bcrypt-playgroundComing soonBcrypt PlaygroundHash and compare bcrypt strings safely.
/hmac-generatorComing soonHMAC GeneratorKeyed digests for webhook signatures.
/csr-decoderComing soonCSR / Certificate DecoderRead certificate signing requests as data.
/diff-checkerComing soonDiff CheckerCompare two texts with word-level highlighting.
/http-status-codesComing soonHTTP Status ReferenceEvery status code with when-to-use guidance.
/user-agent-parserComing soonUser-Agent ParserDecompose user-agent strings into facts.
/mime-typesComing soonMIME Type LookupFile extensions to MIME types and back.
/url-parserComing soonURL ParserSplit URLs into protocol, host, path, query and hash.
/csv-viewerComing soonCSV ViewerPreview and inspect CSV files as tables.
/mock-dataComing soonMock Data GeneratorRealistic fake records from a schema.
/json-pathComing soonJSONPath PlaygroundQuery JSON documents with JSONPath.
/text-statisticsComing soonText StatisticsWords, characters, sentences and reading time.
/string-escapeComing soonString EscaperEscape strings for JSON, JS, SQL and shell.
/text-sortComing soonLine Sorter & DeduperSort, reverse and dedupe lines instantly.
/timezone-converterComing soonTimezone ConverterOne moment, every timezone.
/duration-calculatorComing soonDuration CalculatorAdd and subtract durations across units.
/date-diffComing soonDate DifferenceExact spans between two dates.
/regex-libraryComing soonRegex LibraryCurated, tested patterns for common tasks.
/jwt-builderComing soonJWT BuilderCompose unsigned test tokens for development.
/api-request-builderComing soonAPI Request BuilderCompose and export curl/fetch requests.
/webhook-inspectorComing soonWebhook InspectorCapture and replay webhook payloads.
/uuid-decoderComing soonUUID InspectorVersion, variant and timestamp from any UUID.
/color-paletteComing soonPalette BuilderBuild accessible color scales from a seed.
/contrast-checkerComing soonContrast CheckerWCAG contrast ratios for color pairs.
/svg-optimizerComing soonSVG OptimizerMinify SVGs without visual change.
/image-to-base64Coming soonImage → Base64Inline images as data URIs.
/gitignore-builderComing soonGitignore BuilderCompose .gitignore files by stack.
/chmod-calculatorComing soonChmod CalculatorSymbolic and octal permissions, visualized.
/json-schema-validatorComing soonJSON Schema ValidatorValidate documents against a schema.
/env-diffComing soon.env DiffCompare environment files for drift.
/ai-regex-explainerExperimentalAI Regex ExplainerPaste a pattern, read what it does in plain language.
/ai-json-reshaperExperimentalAI JSON ReshaperDescribe the output shape; the tool writes the transform.
/ai-sql-explainerConceptAI SQL ExplainerUnderstand a query before you run it.
/ai-error-decoderConceptAI Error DecoderStack traces, translated into causes.