Developer

Paste a curl command, inspect the request shape, and export fetch, axios, or Python requests code.

Free docker run to docker-compose converter. Turn a long docker run command line into a clean Compose v3 service definition: image, container name, ports (-p), volumes (-v), environment (-e), --restart, --network, working dir (-w), entrypoint and trailing command. Live YAML preview, one-click copy, 100% in-browser.

Free HTTP request builder: pick a GET/POST/PUT/PATCH/DELETE/HEAD/OPTIONS method, query params merged into the URL, headers and a raw or JSON body, then copy the live cURL, fetch and raw HTTP/1.1 output in one click. Nothing is ever sent — code generation only, 100% in-browser.

Free in-browser JSONPath tester. Paste a JSON document, type a JSONPath expression, and instantly see all matching values as a pretty-printed array. Supports the root $, child .key and ['key'] access, array [index], [*] wildcards, .. recursive descent and [start:end] slices, with one-click copy and live error banners.

A client-side regex find-and-replace tool: enter a pattern, toggle flags, write a replacement with $1 / $<name> capture references, and watch the transformed text update live.

Free in-browser tool to generate and decode an HTTP Basic Auth header from a username and password. UTF-8-safe Base64, Authorization header, curl examples, and a decode panel.

A free, in-browser tool that validates commit messages against Conventional Commits 1.0.0, parsing the type, scope and body while listing errors and warnings.

A searchable quick reference of 50+ essential Git commands grouped into setup, staging, commit, branch, merge/rebase, remote, undo, stash, inspect, and tags.

Generate, preview, and import every meta tag your page needs — SEO, Open Graph, Twitter and more.

Preview how your title, description, URL, and image will look in Discord, X, and search results before publishing.

Structural validator for OpenAPI 3.x and Swagger 2.0 specs in JSON or YAML. Detects the version, requires info.title and info.version, checks every path item for valid HTTP methods and operation responses, and counts paths and operations.

A client-side tool that builds copy-paste redirect configuration for four popular servers from a list of from→to path pairs, using the status code you pick (301 or 302).

Look up regex syntax fast: character classes, anchors, quantifiers, groups, lookaround, flags, and ready-made patterns for email, URL, IPv4, dates and more.

Free interactive on-page SEO audit checklist with 40+ actionable checks across seven categories. Tick items off, track a weighted completion score and per-category progress, then copy a markdown audit report. Your progress is saved locally in your browser.

Free User-Agent parser that breaks any User-Agent header into browser (Chrome, Firefox, Safari, Edge, Opera), layout engine (Blink, Gecko, WebKit, Trident), operating system (Windows, macOS, Linux, Android, iOS) and device type (desktop, mobile, tablet, bot). Prefilled with your own browser's string, with live parsing and one-click copy — 100% in-browser.

Estimate and compare LLM API costs across OpenAI, Anthropic, Google, Mistral, Groq, DeepSeek, and more.

Turn a sample response into reusable mock payloads, curl snippets, fetch calls, TypeScript types, and OpenAPI response blocks.

Free git branch name generator. Pick a type (feature, bugfix, hotfix, release, chore, docs), add an optional ticket id and a description, choose your separator and kebab- or snake-case, and get a clean, slugified branch name instantly. Unicode is transliterated, unsafe characters are stripped, everything runs in your browser.

Minify HTML, CSS, and JavaScript code by stripping whitespace, comments, and redundant characters.

Free email normalization and validation tool. Paste one address per line; each address is reduced to its canonical mailbox (Gmail/Googlemail dots and +tags removed, googlemail.com folded into gmail.com), validated, and duplicates are flagged. Live preview, one-click copy, 100% in-browser.

An in-browser tool that analyzes the keyword density of a text, listing the most frequent phrases alongside word, character and sentence counts and reading time.

Generate a robots meta tag and X-Robots-Tag HTTP header with toggles for noindex, nofollow, noarchive, nosnippet, noimageindex, notranslate, max-snippet, max-image-preview, max-video-preview and unavailable_after.

Build, lint, and compare system prompts for AI assistants — with a curated library of 30+ production-quality templates.

Validate a UUID's 8-4-4-4-12 format and detect its RFC 9562 version and variant entirely in your browser.

Free code line counter that classifies every line of pasted source as code, comment or blank. Choose a language so single-line markers (//, #, --) and block comments (/* */, <!-- -->) are detected correctly, then read the live totals, percentages and a proportion bar. Runs entirely in your browser.

Compare two text blocks with a clear unified diff output and line counters.

Parse .env files, surface duplicate keys and empty secrets, and generate a cleaner .env plus .env.example output.

A fully client-side tool that reformats a MAC address into four notations (colon, hyphen, Cisco dot and bare), resolves its vendor offline, and decodes the multicast and locally-administered bits. It also generates random MAC addresses.

Build, validate, and merge Model Context Protocol configs for Claude Desktop, Claude Code, Cursor, Cline, Continue, and Zed.

Test JS regex, inspect named groups, preview replacements, and avoid catastrophic backtracking.

Tune title, URL, and description and see exactly how Google, Bing and DuckDuckGo will render the snippet.

Build, simulate, analyze, and live-test CORS configurations across every server stack.

Build standard, AWS, and Quartz cron expressions with field inputs and upcoming run previews.

Pick languages, frameworks, editors, OS, and tools — get a clean, deduped, opinionated .gitignore (or .dockerignore) in seconds.

Read raw response headers, highlight missing security protections, and summarize cache and CORS behavior.

Build a polished README.md from toggleable sections — title, badges, features, installation, usage, API, tech stack, roadmap, license — with live Markdown preview.

Break any regex pattern into plain-English token cards, see a railroad diagram, lint risky patterns, and translate across regex flavors.

Build, validate, and audit Google Analytics campaign URLs with naming convention enforcement and reverse parsing.

Build, send, and inspect HTTP requests in the browser. Headers, params, body, auth helpers, response inspector with cookies / headers / raw tabs, HMAC signature panel.

Searchable dictionary of every standard HTTP status code with category color coding, common scenarios, what-to-do guidance, and copy-ready snippets for Express / Next.js / Go / Flask / Axum / curl.

Full IPv4 subnet calculator — CIDR info, subnet splitter, VLSM allocator, range → CIDR converter, and a complete /1 → /32 reference table.

Encode or decode Base64, URL, and HTML entities in a single utility panel.

Craft Conventional Commits 1.0.0 messages with live preview, breaking-change handling, footers, and copy-as-git-command.

Parse Cookie or Set-Cookie lines, inspect attributes, and build a clean Set-Cookie header visually.

Trim long prompts down to a token budget — boundary-aware, with strategies for chat history, document QA and code review.

Generate, validate, and split sitemap.xml files with handling for 50k URL limits and image/video extensions.

Bidirectional URL parser, builder, and diff tool — protocol, query params, path segments, Punycode, plus mailto / data / magnet decoders.

Build beautiful ASCII folder trees for READMEs — point-and-click, paste indented text, or drop a folder.

Pick an open-source license through a guided quiz, browse 30 popular options, or compare them side-by-side.

Format, validate, and extract phone numbers with Google's libphonenumber — entirely in your browser.

Build a pixel-perfect Twitter / X card preview, validate against best practices, and copy a head-ready snippet or Next.js Metadata literal.

Convert POSIX file permissions between octal, symbolic, and a checkbox grid — with chmod commands and security warnings.

Audit H1–H6 hierarchy, catch SEO and accessibility issues, and export a clean document outline.

Generate, validate, and audit hreflang tags in HTML, HTTP header, XML sitemap, Next.js Metadata, and JSON.

Visually build, parse, and test robots.txt files with rule matching that follows Google's spec.

Search 250+ MIME types, swap extensions and content types, and see what the browser thinks your file really is.