Developer Utilities

Everyday utilities for developers.

87 tools

.editorconfig Generator Generate a .editorconfig from a few options.
.gitignore Generator Build a .gitignore for any combination of languages and stacks.
.nvmrc Helper Pick a Node.js version and generate a .nvmrc.
ANSI Escape Reference Searchable cheatsheet of ANSI / CSI terminal codes.
Apache Virtual Host Builder Generate an Apache <VirtualHost> block from a small form.
ASCII Banner Text Render text as a multi-line ASCII art banner.
Base64 Encoder / Decoder Encode text to Base64 or decode Base64 back to plain text.
Bash <-> PowerShell Translator Translate Bash one-liners to PowerShell and vice versa using a rules table.
Bash Cheat Sheet Searchable reference for everyday Bash commands.
Chmod Calculator Toggle Linux file permission bits and read both numeric and symbolic chmod.
Color Code Converter Convert HEX ↔ RGB ↔ HSL ↔ HSV in one step.
Conventional Commit Builder Compose a properly formatted Conventional Commits message.
Cron Expression Parser Parse a cron expression and translate it to plain English.
Cron Next-N Runs Compute the next N UTC firings of a cron expression from a start date.
Cron → Quartz / EventBridge Convert Unix cron to Quartz or AWS EventBridge expression form.
CSS Selector Tester Run a simple CSS selector against pasted HTML.
CSS Specificity Calculator Calculate selector specificity as ID, class and element weights.
CSS → Tailwind Suggestions Suggest Tailwind utility classes for a block of CSS.
Docker Run to Compose Converter Convert a docker run command into a Docker Compose service.
Dockerfile Linter Check Dockerfiles for common security and portability issues.
Dockerfile Linter Pro Lint Dockerfiles for security, cache and bloat issues with rule ids and line numbers.
Env File Doctor Lint .env files for duplicates, malformed lines, inline comments and likely secret leaks.
ENV File Parser / Validator Validate .env syntax and inspect key/value pairs.
Gettext .po Parser Parse a gettext .po file and list its entries.
git log Command Builder Assemble a git log command from form inputs.
Glob Pattern Tester Test a glob pattern (** ? *) against a path list, and show its regex.
GraphQL Query Formatter Pretty-print a GraphQL query or mutation and list its declared variables.
GraphQL Schema Formatter Format and validate GraphQL schema definitions.
HAR Waterfall Render a HAR file as a waterfall with status filters and per-entry headers.
HOTP Generator Generate counter-based one-time passwords using RFC 4226 HOTP.
HTML / CSS / JS Minifier Minify HTML, CSS or JavaScript safely.
HTML Encoder / Decoder Escape or unescape HTML entities like &, <, >.
htpasswd Entry Generator Generate APR1-MD5 or SHA-1 entries for .htpasswd files.
HTTP Header Reference Searchable reference for common HTTP request and response headers.
HTTP Status Codes Searchable reference of all standard HTTP status codes.
HTTP/2 Header Compression Explainer Explain how HPACK compresses repeated HTTP/2 headers.
ICU MessageFormat Tester Render an ICU MessageFormat template with plural/select arms.
Indent / Whitespace Detector Detect whether a file uses tabs, 2-space or 4-space indentation.
IP CIDR Notation Builder Suggest CIDR notation for IP ranges.
jq-lite Playground Evaluate a jq-style path filter against pasted JSON.
JSON Schema Bulk Sampler Generate N sample records matching a JSON Schema, with seed control and optional field variation.
JSON Schema Sample Generator Generate an example document from a JSON Schema.
JSON Sort Keys Recursively sort object keys in a JSON document alphabetically.
JSON to Dart Class Generate Dart classes from a JSON sample.
JSON to PHP Class Generate PHP classes from a JSON sample.
JSON to Pydantic Model Generate Pydantic BaseModel classes from a JSON sample.
JSON to Rust Struct Generate Rust serde-derive structs from a JSON sample.
JWT Crafter Sign and verify JWTs with HS256/384/512 or RS256/384/512 keys.
JWT Decoder Decode a JWT to inspect its header, payload and signature.
Kubernetes YAML Linter Fast best-practice checks for a Kubernetes manifest.
License Compatibility Checker Check whether two software licenses can be combined.
License Generator Generate a LICENSE file for MIT, Apache, GPL, BSD, ISC or Unlicense.
Liquid Template Tester Render a small Liquid template against JSON data.
Makefile Parser Extract targets, variables and includes from a Makefile.
Markdown Linter Spot trailing whitespace, long lines and bad heading order in Markdown.
Markdown TOC Generator Build a table of contents from Markdown headings.
Mermaid Template Gallery Copy-ready Mermaid diagram templates for GitHub, GitLab and Notion.
MIME Type Lookup Look up the MIME type for a file extension (and vice versa).
Mustache / Handlebars Tester Render a Mustache template against JSON data.
nginx Config Builder Generate a reverse-proxy or static-site nginx server block.
OpenAPI / Swagger Viewer List the endpoints in an OpenAPI (Swagger) JSON document.
OpenAPI Snippet Exporter Export cURL, HTTPie, Postman v2.1 and JS fetch snippets from an OpenAPI spec.
package.json Generator Generate a clean package.json from a small form.
POSIX / PCRE Regex Translator Translate regex between POSIX character classes and PCRE shorthand.
Postman Collection Viewer List every request in a Postman v2.x collection export.
PowerShell Cheat Sheet Searchable reference for everyday PowerShell cmdlets.
Pre-commit Hook Generator Build a .pre-commit-config.yaml from common hooks.
Protobuf ↔ JSON Converter Decode a hex/base64 protobuf message against a .proto schema, or preview the wire bytes for a JSON payload.
README Generator Scaffold a project README from a small form.
Regex Cheat Sheet Quick reference for regular expression syntax across flavours.
Regex Tester Pro Test .NET regex with capture groups, named groups, replacements, presets and a built-in cheat sheet.
REPL Prompt Stripper Strip $, >>> and other REPL prompts from a pasted code block.
Semantic Release Preview Given a current version and conventional-commit list, suggest the next version.
Semantic Version Comparator Compare semantic version numbers and see which is newer.
Sourcemap Lookup Resolve a generated line:column to original source via a v3 source map.
SQL Dialect Translator Translate SQL between PostgreSQL, MySQL, SQL Server and SQLite dialects.
SQL EXPLAIN Visualizer Render a Postgres / MySQL / SQL Server query plan as a collapsible tree with cost highlights.
SVG Minifier Minify SVG markup by removing extra whitespace.
systemd Unit File Generator Build a systemd .service unit from a form.
Tailwind Config Validator Check a tailwind.config.js for common mistakes.
TCP / UDP Port Reference Look up well-known TCP and UDP port assignments.
TypeScript <-> C# DTO Converter Convert a TypeScript interface or C# class/record to the other language.
Unified Diff Parser Parse and visualise unified diff or git diff output.
Unix Timestamp Converter Convert between Unix timestamps and human dates.
URL Encoder / Decoder Percent-encode URLs or decode them back to readable form.
UUID Generator Generate v4 / v7 UUIDs (GUIDs) with one click.
XPath Tester Evaluate an XPath expression against pasted XML.