Developer tools
18 free developer tools.
Free local-first developer tools for JSON, JWT, timestamps, UUIDs, regex, Markdown, SQL, XML, cron, and everyday code work.
Developer tool list
JSON FormatterFormat, minify, and validate JSON locally in your browser without uploading input.LocalJWT DecoderDecode JWT headers and payloads locally in your browser without sending tokens to a server.LocalTimestampConvert Unix timestamps and ISO dates locally in your browser.LocalUUID GeneratorGenerate UUID v4 values locally in your browser with the Web Crypto API.LocalHash GeneratorGenerate SHA-1, SHA-256, SHA-384, and SHA-512 digests locally in your browser.LocalRegex TesterTest regular expressions locally in your browser and inspect matches with indexes.LocalMarkdown PreviewPreview Markdown. Runs locally in your browser without uploading input.LocalYAML to JSONSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalJSON to YAMLSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalJSON DiffSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalJSON Path TesterSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalXML FormatterSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalSQL FormatterSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalCron ParserSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalUser-Agent ParserSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalGitignore GeneratorSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalLicense PickerSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.LocalREADME TemplateSmall local utility for quick browser-based transformations. Runs locally in your browser without uploading input.Local
Built for quick work
These tools are designed for short, repeated tasks where opening a full application would slow you down.
Privacy-first by default
Local tools run in the browser. Network tools are clearly marked when public web data has to be requested.