Development utilities

Decode a DER or BER structure from hex or base64 into a tree of tags, lengths and values.

Decompose a float into sign, exponent and mantissa, with neighbours, ULP and round-trip error.

Convert an octal or symbolic file mode into numeric, symbolic and special-bit forms.

Produce a unified diff between two texts with configurable context and an optional patch header.

Build a five-field cron expression from a preset or field by field, with the next runs.

Parse a five-field cron expression and show the next scheduled runs.

Indent and expand a CSS stylesheet.

Compress a CSS stylesheet by removing whitespace and redundant tokens.

Add or subtract a duration and measure the exact gap between two dates.

Build a docker-compose.yml from an image, ports, volumes, environment, healthcheck and dependencies.

Generate a multi-stage Dockerfile for Go, Node, Python, Rust or PHP.

Quote, escape and expand a .env block and render it as JSON, YAML or shell exports.

Assemble a Conventional Commits message and check the 50/72 column rules.

Build a workflow with a job matrix, steps, a cache key and an artifact upload.

Assemble a .gitignore from a stack selection plus your own patterns.

Indent an HTML document or fragment and tidy up tag nesting.

Compress HTML by removing whitespace, comments and redundant attributes.

Build a Huffman code, measure entropy and compression ratio and export the tree as Mermaid and DOT.

Build an HTML anchor, Markdown, reStructuredText, BBCode, mailto:, tel: and a plain-text entry from one URL.

Re-indent JavaScript while preserving strings, template literals, regexes and comments.

Compress JavaScript source with a real parser.

Generate TypeScript interfaces from a JSON Schema, resolving types, enums, items and $ref.

Generate Go structs with json tags from a JSON sample.

Generate TypeScript interfaces from a JSON sample, with unions and optional fields.

Minimise a truth table into a sum of products and a NAND-only form.

Generate a Deployment and Service, with an optional Ingress, from a handful of settings.

Generate placeholder paragraphs, sentences or words, with an optional HTML wrapper.

Identify a MIME type from a filename, a base64 blob or a text snippet, with charset and magic bytes.

Encode and decode ITU Morse with a selectable separator and an option to keep unknown characters.

Build an nginx server block with TLS, proxying, gzip, security headers and redirects.

Evaluate an expression with bitwise operator semantics and two's-complement wrapping for a chosen word size.

Derive a regular expression from example strings and check it against counter-examples.

Emit the equivalent regex snippet in eight languages and list the named groups and matches.

Parse an RSS 2.0 or Atom feed and check required elements, dates, GUID uniqueness and enclosures.

Compare two semantic versions, test a range expression and compute the next increment.

Intersect two or more semver ranges and return the resulting range or the empty set.

Turn any text into a URL-friendly slug.

Uppercase SQL keywords, break lines per clause and indent subqueries.

Work out the frame size, per-byte time, throughput, baud error and divisor latch for a UART frame.

Convert any unit across length, mass, area, volume, speed, temperature, data, pressure, energy and angle.