🛠Dev
Developer tools cover the everyday workflow: format and validate JSON, test regular expressions, decode JWTs, convert formats, generate hashes and inspect data. Built to speed up common tasks without leaving the browser.
136 tools
CSS Button Generator
Create custom CSS buttons: color, text, padding, border-radius, shadow and hover. Live preview and ready-to-copy HTML+CSS. Everything in your browser.
Hexdump
View any text as a canonical hexdump (offset / hex bytes / ASCII), like Unix `hexdump -C`. Useful to inspect binary data, encoding and invisible separators. Everything in your browser.
MIME Types (Reference)
Searchable MIME type table — search by extension (.json, .pdf) or MIME (application/json, image/png). Includes common formats for web, audio, video, fonts and documents. Everything in your browser.
Keycode Info
Press any key and see `event.key`, `event.code`, `keyCode`, `which` and `location`. Useful to build shortcuts, games and keyboard-aware forms. Everything in your browser.
Regex Cheatsheet
Quick reference of the main regular expressions — quantifiers, classes, anchors, groups, lookarounds, flags. With clickable examples and explanations. Everything in your browser.
Git Cheatsheet
Searchable list of the most-used git commands — config, commit, branch, merge, rebase, stash, log, remote, reset. With copyable examples. Everything in your browser.
Markdown Cheatsheet
Quick reference for Markdown syntax, filterable by keyword: headings, lists, links, tables, code and more. Shows the raw syntax next to what it does.
.htpasswd Generator
Generate .htpasswd lines for Apache/Nginx basic auth. Supports MD5 (apr1), SHA1 and bcrypt hashes. Paste the result straight into the file. Everything in your browser.
Basic Auth Generator
Generate the HTTP `Authorization: Basic <base64>` header from username and password. Useful to test APIs with basic auth via curl, Postman or fetch. Everything in your browser.
.editorconfig Generator
Generate a .editorconfig file with indent_style, charset, end_of_line and trim_trailing_whitespace. Standardizes editors across teams. Everything in your browser.
.gitignore Generator
Generate a .gitignore by combining language/IDE templates — Node, Python, Java, Go, Rust, .DS_Store, JetBrains, VSCode etc. Everything in your browser.
Dockerfile Generator
Build a Dockerfile from common templates: Node, Python, Go, Static Nginx, with optional multi-stage, healthcheck and non-root user. Everything in your browser.
GitHub Actions Generator
Generate YAML workflows for GitHub Actions: Node CI, static deploy, semver release, lint+test. Customize triggers and steps. Everything in your browser.
tsconfig.json Generator
Generate a custom tsconfig.json: ES target, module, strict, paths, JSX, declaration and more. Validation against invalid options. Everything in your browser.
package.json Generator
Build a minimal package.json: name, version, description, scripts, license, repository, type (module/commonjs). Everything in your browser.
Cron Parser (describe expression)
Paste a cron expression and see in plain text when it will fire (e.g. "every day at 9am" for `0 9 * * *`). Lists the next N runs. Everything in your browser.
CSS Specificity Calculator
Compute the specificity (a, b, c) of a CSS selector — IDs, classes/attributes/pseudo-classes, elements. Useful to understand why your rule is not applying. Everything in your browser.
ASCII Tree Generator
Paste an indented structure (spaces/tabs) and generate an ASCII tree ready for README — ├──, └── etc. Everything in your browser.
Markdown TOC Generator
Generate the table of contents of a Markdown file from headings (#, ##, ###). Includes GitHub-style anchors. Everything in your browser.
CSS Unit Converter
Convert between px, em, rem, %, pt, vh, vw for common design values — configurable 16 px base. Everything in your browser.
HTTP Request Builder
Build an HTTP request (URL, method, headers, body) and generate snippets in cURL, fetch, axios, Python requests and Go net/http. Everything in your browser.
Regex Visualizer
Paste a regex and see the token tree (literals, classes, groups, quantifiers) in ASCII — helps understand complex expressions. Everything in your browser.
Discord Embed Builder
Build Discord embeds (title, description, color, fields, footer, thumbnail) and export the JSON ready for webhook. Includes preview. Everything in your browser.
README.md Generator
Build a professional README.md filling in name, description, badges, install, usage, license. Markdown preview side-by-side.
PWA manifest.json Generator
Build a manifest.json for a PWA (name, short_name, theme_color, background_color, display, icons) with preview.
Prettier Config Generator
Generates a ready .prettierrc with the most common choices: single quotes, no semicolons, trailing commas and a 100-column line.
ESLint Airbnb Config Generator
Generate an .eslintrc.json using the Airbnb preset, the most popular JavaScript style guide. Standardize your React and Node code and copy the config.
ESLint Standard Config Generator
Build a ready-to-paste .eslintrc.json using the Standard preset — no semicolons, single quotes, two-space indent. Runs in your browser, nothing to install.
tsconfig Strict Generator
Generate a strict tsconfig.json.
tsconfig Base Generator
Generate a basic tsconfig.json for JS-to-TS migration.
Webpack Config Generator
Generate a minimal webpack.config.js.
Rollup Config Generator
Generates a rollup.config.js to bundle libraries as ESM and CommonJS, with the node-resolve, commonjs and terser plugins already wired. A fixed block, ready to tweak.
esbuild Config Generator
Generates a ready esbuild.config.js for fast builds, with entry point, bundle, minification, sourcemap and target already set. The output format is left at the esbuild default.
Storybook main.js Generator
Generate the .storybook/main.js for Storybook 7+ with React and Vite, ready to use. Copy the config and start documenting your components in minutes.
Tailwind Config CLI Generator
Generate a ready-to-use tailwind.config.js for the Tailwind CLI, with content paths and theme set up. Copy it and start styling in seconds.
Prisma Init Generator
Generate an initial schema.prisma.
Mongoose Init Generator
Generate the Mongoose connection to MongoDB plus a sample schema, ready to drop into your Node.js project. Start modeling your data in seconds.
Sequelize Init Generator
Generates the Sequelize ORM config/config.js with development, test and production environments, all on the postgres dialect. Copy it and adjust the credentials.
TypeORM Init Generator
Generate a starter TypeORM data-source.ts with a ready PostgreSQL connection, in TypeScript. Copy the file and start using entities and migrations.
Drizzle Init Generator
Generates a drizzle.config.ts for the Drizzle ORM with the PostgreSQL dialect, ready for migrations. Copy the file and set up your type-safe schema.
vercel.json Generator
Create a vercel.json with routes, redirects and HTTP headers ready for your Vercel deploy. Set it all up in the browser and drop it into your repo.
netlify.toml Generator
Generate a netlify.toml with build command, redirects and security headers ready for your Netlify deploy. Set it up in the browser and copy the file.
Cloudflare wrangler.toml Generator
Generates a wrangler.toml for Cloudflare Workers, with name, compatibility date, environment variables and a KV namespace. Routes are yours to add.
railway.toml Generator
Generate a railway.toml with build, start and healthcheck settings ready for your Railway deploy. Configure it in the browser and drop it in your repo.
Kubernetes ConfigMap Generator
Generate a Kubernetes ConfigMap in YAML from key=value pairs, ready to apply with kubectl. Centralize your pod configuration in seconds.
Kubernetes Secret Generator
Generate a Kubernetes Secret in YAML with values already base64-encoded. Store passwords and tokens safely and apply them to your cluster with kubectl.
Kubernetes Ingress Generator
Generates a Kubernetes Ingress with host, service and port, using the nginx ingressClassName and a root path. The TLS block is yours to add.
Kubernetes CronJob Generator
Generate a Kubernetes CronJob in YAML with the schedule expression and the container to run. Schedule recurring tasks in your cluster and apply with kubectl.
docker-compose PostgreSQL Generator
Generate a ready-to-use docker-compose for PostgreSQL, with user, password, database and a persistent volume set up. Spin up your local DB with one command.
docker-compose Redis Generator
Generates a ready-to-use docker-compose for Redis, publishing port 6379 with a persistent volume. Pick the image tag and spin up your local cache or broker with one command.
docker-compose MongoDB Generator
Generates a ready-to-use docker-compose for MongoDB, with root user and password, port 27017 published and a persistent volume. You create the database after it starts.
docker-compose MySQL Generator
Generates a ready-to-use docker-compose for MySQL, with the root password, port 3306 published and a persistent volume. Pick the image tag and start the database.
JWT Decoder Verbose
Decodifica JWT (sem verificar assinatura) e explica cada claim (iss/sub/aud/exp/nbf/iat/jti).
OAuth2 Authorization URL Builder
Monta URL de autorização OAuth 2.0 com response_type, client_id, redirect_uri, scope, state.
HTTP Status Code Lookup
Consulta significado de códigos HTTP de 1xx a 5xx.
MIME Type por Extensão
Retorna o MIME type oficial para uma extensão de arquivo.
ETag Weak vs Strong
Classifica um ETag como weak (W/"...") ou strong. Weak é igualdade semântica, strong é byte-a-byte.
Cache-Control max-age Explained
Convert the Cache-Control max-age value (in seconds) into a readable time in hours and days. Useful for understanding and debugging HTTP cache and CDNs.
/etc/hosts a partir de CSV
Monta entradas /etc/hosts a partir de CSV (ip,hostname por linha).
ARIA Role Lookup
Consulta propósito de role ARIA (de 80+ roles WAI-ARIA 1.2).