Developer utilities
Free online developer tools
Browse browser-based utilities for formatting JSON and HTML, decoding JWTs, testing regex, converting timestamps, generating UUIDs, and more. Every tool runs locally with no signup and no uploads.
Formatting Tools
6 tools
Clean up code, content, and markup for faster debugging and readable output.
- json formatter onlineJSON Formatter & ValidatorFormat raw JSON, validate syntax, and pretty-print structured data instantly in your browser.
- markdown previewer onlineMarkdown PreviewerWrite Markdown and preview rendered output side by side with clean typography.
- html formatter onlineHTML Formatter / MinifierBeautify messy HTML or minify markup for compact embeds and production snippets.
- xml formatter onlineXML Formatter / MinifierPretty-print or minify XML for RSS feeds, SOAP envelopes, Android layouts, and config files—validated locally in your browser.
- yaml formatter onlineYAML Formatter / MinifierFormat and validate YAML for Kubernetes, Docker Compose, and CI pipelines with local parsing and copy-ready output.
- css formatter onlineCSS Formatter / MinifierBeautify or minify CSS rules for components, email templates, and quick style debugging in the browser.
Conversion Tools
4 tools
Convert between common developer formats instantly without leaving the browser.
- base64 encoder onlineBase64 Encoder / DecoderEncode plain text to Base64 or decode Base64 payloads instantly with UTF-8 support.
- url encoder decoder onlineURL Encoder / DecoderEncode and decode URLs, query strings, and path values safely for browser and API workflows.
- case converter onlineCase ConverterConvert identifiers between camelCase, PascalCase, snake_case, kebab-case, and CONSTANT_CASE for APIs and configs.
- timestamp converter onlineTimestamp ConverterConvert Unix timestamps to human-readable dates and parse readable dates back to Unix values.
Generators
4 tools
Generate IDs, palettes, gradients, and interfaces for day-to-day development work.
- uuid generator onlineUUID GeneratorGenerate UUID v4 values in batches for seeds, fixtures, IDs, and test data.
- color palette generatorColor Palette GeneratorGenerate balanced color ramps from a base color for UI themes, design systems, and dashboards.
- gradient generator cssGradient GeneratorBuild CSS gradients with live previews, adjustable angles, and easy copy-to-clipboard output.
- json to typescript interface generatorJSON to TypeScript Interface GeneratorConvert sample JSON into TypeScript interfaces for faster API typing and frontend scaffolding.
Developer Utilities
5 tools
Inspect tokens, validate patterns, and work through developer workflows faster.
- jwt decoder onlineJWT Decoder / InspectorDecode JWT headers and payloads, inspect claims, and review token timestamps locally.
- regex tester onlineRegex Tester with ExplanationTest regular expressions, review matches, and get a lightweight explanation of common regex tokens.
- hash generator onlineHash GeneratorGenerate SHA-256, SHA-384, SHA-512, and SHA-1 hex digests from text using Web Crypto in your browser.
- cron expression parserCron Expression ParserExplain standard five-field cron expressions in plain English for crontab, workers, and CI schedules.
- query string parserQuery String ParserParse URL query parameters into a table and rebuild percent-encoded query strings for API debugging.