Reference: HTTP status, MIME, ASCII, keycodes
66 tools in this category. Each runs in your browser.
Reference tools answer a specific factual question fast: what does HTTP 422 mean, which MIME type does a .webp file use, what is the event.code for the left arrow key, what octal matches rwxr-xr-x, or which control character is decimal 27. You could search the web for each of these, but a focused table that loads instantly and filters as you type is quicker and stays out of your way.
The HTTP status code reference lists every standard code by class, with a plain-sentence meaning and a filter that matches a number or a phrase. The MIME type reference looks up media types by either the type string or the file extension, so it works whichever end you start from. The ASCII table shows all 128 code points with their decimal, hex, octal, and binary values and the names of the control characters. The keycode tester reports the modern event.key and event.code for any key you press, alongside the legacy keyCode. The chmod calculator turns permission checkboxes into the octal and symbolic forms and back.
Everything renders in your browser from data baked into the page, so the tables work offline once loaded and nothing you type is sent anywhere. Pick a reference below and start typing to filter.
All 66 tools in this category
HTTP status code reference
Search every standard HTTP status code by number or name.
MIME type reference and lookup
Look up media types by MIME string or file extension.
ASCII table (0-127)
All 128 ASCII codes: decimal, hex, octal, binary, names.
JavaScript keycode tester
Press any key to see event.key, event.code, and keyCode.
chmod permission calculator
Toggle rwx bits to get octal (755) and symbolic form.
Emoji picker (copy and paste)
Search 450+ emoji by name, click to copy and paste.
Regex cheat sheet
Searchable regex reference: tokens, quantifiers, and ready-made patterns.
Git command cheat sheet
Searchable reference of common git commands and what each one does.
Bash cheat sheet
Searchable reference of common bash shell commands and syntax.
SQL cheat sheet
Searchable standard SQL syntax reference, filter by category.
Crontab cheat sheet
Searchable cron syntax and schedule examples.
Markdown cheat sheet
Searchable CommonMark and GitHub Flavored Markdown syntax reference.
Docker cheat sheet
Searchable Docker CLI and Dockerfile command reference.
CSS Flexbox cheat sheet
Searchable CSS flexbox property reference with layout recipes.
JavaScript array methods
Searchable reference of JavaScript array methods.
HTTP headers reference
Searchable list of HTTP request, response, and security headers.
curl command cheat sheet
Searchable curl command reference with what each flag does.
Vim cheat sheet
Searchable Vim keystroke reference that runs in your browser.
CSS Grid cheat sheet
Searchable CSS Grid properties, values, and layout recipes.
kubectl cheat sheet
Searchable Kubernetes kubectl command reference.
tmux cheat sheet
Searchable tmux keybinding and command reference.
PostgreSQL cheat sheet
Searchable PostgreSQL reference: psql, queries, JSONB, and admin.
npm cheat sheet
Searchable npm CLI command reference.
ffmpeg cheat sheet
Searchable ffmpeg command reference for audio and video.
SSH cheat sheet
Searchable SSH reference: keys, config, tunnels, and file transfers.
Common ports reference
Search well-known TCP and UDP ports by number, service, or protocol.
Python cheat sheet
Searchable Python 3 syntax reference that runs in your browser.
sed and awk cheat sheet
Searchable sed and awk one-liner reference.
PowerShell cheat sheet
Searchable PowerShell cmdlet and syntax reference.
TypeScript utility types
Searchable reference of TypeScript utility types like Partial and Pick.
Redis commands cheat sheet
Searchable reference of common Redis commands.
YAML cheat sheet
Searchable YAML syntax reference that runs in your browser.
grep cheat sheet
Searchable grep command cheat sheet.
CSS units reference
Searchable reference of every CSS unit and what each one does.
Go cheat sheet
Searchable Go language syntax reference that runs in your browser.
Rust cheat sheet
Searchable Rust syntax, ownership, and error handling reference.
Docker Compose cheat sheet
Searchable Docker Compose CLI and compose-file key reference.
Makefile cheat sheet
Search GNU make rules, variables, and functions in your browser.
JSON Schema cheat sheet
Searchable JSON Schema keyword reference.
find command cheat sheet
Searchable Linux find command reference that runs in your browser.
Emmet cheat sheet
Search Emmet HTML and CSS abbreviations and what they expand to.
Nginx config cheat sheet
Searchable nginx config directive reference with plain-English notes.
Java cheat sheet
Searchable Java syntax reference with plain explanations.
PHP cheat sheet
Searchable PHP syntax cheat sheet: arrays, strings, control flow, OOP.
C# cheat sheet
Searchable C# syntax reference: types, LINQ, records, async.
Sass and SCSS cheat sheet
Searchable Sass and SCSS syntax reference.
GraphQL cheat sheet
Searchable GraphQL schema and query syntax reference.
MongoDB cheat sheet
Searchable mongosh and query API command reference.
Terraform cheat sheet
Searchable Terraform CLI and HCL reference.
React hooks cheat sheet
Searchable list of React hooks with plain-English notes.
C++ cheat sheet
Searchable modern C++ syntax reference.
Ruby cheat sheet
Searchable Ruby syntax reference that runs in your browser.
Kotlin cheat sheet
Searchable Kotlin reference: null safety, collections, classes.
Swift cheat sheet
Searchable Swift syntax reference that runs in your browser.
DNS records reference
Searchable reference of DNS record types and what each one does.
HTML elements reference
Searchable reference of HTML elements by tag name and purpose.
HTTP methods reference
Searchable HTTP methods with safe, idempotent, and REST notes.
Apache htaccess cheat sheet
Searchable Apache htaccess directive reference.
JavaScript cheat sheet
Searchable JavaScript syntax reference that runs in your browser.
TypeScript cheat sheet
Searchable TypeScript syntax reference that runs in your browser.
MySQL cheat sheet
Searchable MySQL 8 command reference with plain-English notes.
systemd cheat sheet
Searchable systemctl, journalctl, and unit file reference.
Ansible cheat sheet
Search Ansible commands, playbook keys, modules, and Jinja vars.
jq JSON cheat sheet
Searchable jq filter reference that runs in your browser.
CIDR and subnetting cheat sheet
Searchable CIDR, subnet mask, IP range, and IPv6 reference.
Emacs cheat sheet
Search GNU Emacs keyboard shortcuts in a fast client-side cheat sheet.
Other categories
- Encoders, decoders, and validators (17 tools)
- Generators and converters (38 tools)
- Text tools (11 tools)
- Image and color tools (8 tools)
- Calculators (28 tools)
- AI-augmented (8 tools)