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