Developer tools

Browser-based utilities for everyday coding work — format JSON or XML, test regular expressions live, beautify or minify HTML/CSS/JS, generate UUIDs, and build cron expressions with a plain-English explanation. All offline-capable; nothing you paste leaves the page.

6 tools
JSON formatter & validator New
Pretty-print or minify JSON, with line/column-precise validation errors. Choose 2-space, 4-space, or tab indentation.
XML formatter New
Pretty-print and validate XML well-formedness via the browser's DOMParser. Preserves comments, CDATA, processing instructions.
Regex tester New
Test JavaScript regular expressions live. Match highlighting, capture-group breakdown, and a replacement preview field.
Code minifier / beautifier New
Format or minify HTML, CSS, and JavaScript with one tool. Char-count stat shows your savings on each pass.
UUID generator New
Generate cryptographically random UUID v4 values, single or in bulk. Lowercase, uppercase, hyphenated or braces format.
Cron expression generator New
Build a 5-field cron schedule from inputs. Plain-English explanation and the next 5 run times update live; common-pattern presets included.

Why browser-based?

Pasting code or data into a remote tool is a small but real privacy risk — internal API responses, customer records, secret tokens. Every tool here runs entirely in your browser via the platform's native APIs (JSON.parse, DOMParser, RegExp, crypto.getRandomValues) so nothing you paste is uploaded anywhere.

Need something not on this list? Drop us a note via the contact page.

Common questions

Do I need an internet connection?

You need it to load the page once. After that, everything runs locally — disconnect and the tools still work. The PWA install button (top-right on mobile) makes them work offline permanently.

Are these production-grade?

For everyday development and quick checks, absolutely. For build-pipeline use (e.g. minifying JS at deploy time) you'll still want dedicated tools like Prettier, terser, esbuild, etc. — they handle edge cases (template literals, ES2024 syntax, source maps) that simple browser-based tools don't.

Can I link to a specific input state?

Not yet. We're working on shareable URLs that encode the input as a query param.

Other categories

UtilityPassword, hash, encoder MathStatistics, probability ConversionUnits & numerals