Developer
Small utilities that save a browser tab: format JSON, inspect tokens, test regex and scaffold types.
25 free developer tools. Every tool runs in your browser, works without an account, and processes files locally whenever the browser allows it.
By the utils.sbs team · Reviewed November 2026
The shelf
All developer tools
25 tools · updated for 2026
- JSON FormatterpopularPrettify JSON with configurable indentation.
- JSON MinifierStrip whitespace from JSON for production.
- JSON ValidatorCheck JSON syntax and locate the first error.
- JSON to TypeScriptGenerate TypeScript interfaces from sample JSON.
- JSON Key SorterRecursively sort object keys alphabetically.
- JavaScript MinifierLightweight whitespace and comment stripping for JS.
- CSS MinifierCompress CSS by removing whitespace and comments.
- HTML MinifierMinify HTML safely without touching content.
- SQL FormatterFormat SQL queries with consistent keywords and indentation.
- Regex TesterTest regular expressions, flags and capture groups live.
- Cron ParserExplain a cron expression in plain English.
- UUID GeneratorGenerate cryptographically random v4 UUIDs in bulk.
- JWT DecoderDecode JWT header and payload without verifying locally.
- URL ParserBreak a URL into protocol, host, path, query and hash.
- URL EncoderPercent-encode text for URLs and query strings.
- URL DecoderDecode percent-encoded URLs and form data.
- Hash GeneratorGenerate SHA-1, SHA-256 and SHA-512 digests.
- Diff CheckerCompare two texts side by side with line-level changes.
- HTML Entity EncoderEscape HTML-sensitive characters safely.
- HTML Entity DecoderDecode HTML entities back to plain characters.
- cURL to FetchConvert a cURL command into JavaScript fetch code.
- YAML to JSONParse YAML and output formatted JSON.
- JSON to YAMLConvert JSON into clean YAML.
- XML FormatterIndent and prettify XML markup.
- HTML BeautifierIndent HTML for readable source.
How this shelf works
About developer tools
Developer tools handle the small, repeatable jobs that show up between real work: json, regex, sql. They are built as focused utilities, so each page does one job without asking you to create an account or install software.
Open a tool, add your input, adjust the settings, and download the result. Processing happens in the browser using the platform APIs available for that file type. Files are not uploaded to a server, so the tool keeps working offline once the page has loaded.
Looking for something else? Browse the full tool index or search the catalogue from the homepage.
Developer tool questions
Are developer tools free?
Yes. Every developer tool on utils.sbs is free, requires no account, and has no per-file or per-use charge.
Are my files uploaded when I use a developer tool?
No. The tools are designed to process input in the browser whenever the platform API allows it. Files are not uploaded to a server for processing.
Do I need to install anything to use these tools?
No. Everything runs in a modern web browser. Open a tool page, use the workspace, and download the result.
How do I choose the right developer tool?
Each tool page describes what it does, its input and output formats, the engine it uses, and its limitations. Start with the description that matches your job, then open the tool page for the workspace and step-by-step guide.