Reference data for production code.
100 reference datasets every application needs, as JSON, CSV, and TypeScript at stable, CORS-enabled URLs. Fetch at runtime, embed at build time, or import as code. Free, no API key.
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Catalog
- airlines Geo
Airlines worldwide with IATA/ICAO codes, callsign, country, and an active flag, from the OpenFlights database (ODbL).
1,189 records · updated 2026-10-05
- airports Geo
World large and medium airports with IATA/ICAO codes, coordinates, elevation, and country — filtered from OurAirports open data.
4,568 records · updated 2026-10-05
- ansi-colors Code
Standard ANSI SGR escape code numbers with names, categories (foreground/background/style/reset), and descriptions.
56 records · updated 2026-10-05
- aria-attributes Web
All 53 WAI-ARIA states and properties: the 48 from WAI-ARIA 1.2 plus 5 added in the 1.3 draft, with type, value type, and description.
53 records · updated 2026-10-05
- aria-roles Web
All 94 WAI-ARIA 1.2 roles plus the 6 roles added in the WAI-ARIA 1.3 draft, with category, description, and abstract flag.
100 records · updated 2026-10-05
- ascii Code
The 128 ASCII characters with decimal, hex, and octal values, names, category, and printability.
128 records · updated 2026-10-05
- canadian-provinces Geo
All 10 Canadian provinces and 3 territories with 2-letter postal code, name, capital city, and type.
13 records · updated 2026-10-05
- character-encodings Web
IANA-registered character encoding sets with MIBenum identifiers, preferred MIME names, and known aliases for 258 character sets.
258 records · updated 2026-10-05
- csp-directives Web
Content Security Policy directives from CSP Level 3 and related specs, with category (fetch/document/navigation/reporting/other) and description.
30 records · updated 2026-10-05
- continents Geo
The 7 continents with 2-letter code, name, area in km², approximate population, and sovereign country count.
7 records · updated 2026-10-05
- countries Geo
ISO 3166-1 country reference data including codes, names, capitals, currencies, and calling codes.
249 records · updated 2026-10-05
- country-subdivisions Geo
ISO 3166-2 country subdivisions — states, provinces, regions, and more — with code, name, parent country, and subdivision type.
5,046 records · updated 2026-10-05
- credit-card-types Web
Major payment card networks with IIN ranges, card number lengths, CVV length, and regex pattern for client-side validation.
12 records · updated 2026-10-05
- cron-presets Code
Standard cron special-string aliases (@yearly, @monthly, @weekly, @daily, @hourly, @reboot) with their equivalent five-field expressions.
8 records · updated 2026-10-05
- css-at-rules Code
The 20 standard top-level CSS at-rules (as of October 2026) with descriptions and MDN documentation links, covering layout, fonts, animations, and queries.
20 records · updated 2026-10-05
- css-functions Code
124 standard CSS functions (as of October 2026) with category and description, covering math, color, transform, gradient, filter, and more.
124 records · updated 2026-10-05
- css-named-colors Code
The CSS named colors with hex and RGB values, as defined in CSS Color Module Level 4.
148 records · updated 2026-10-05
- css-properties Code
The 671 named CSS properties in MDN's mdn/data (as of October 2026), with syntax, inheritance, initial value, groups, and percentage behavior.
671 records · updated 2026-10-05
- css-pseudo-classes Code
78 standard CSS pseudo-classes (as of October 2026) from MDN and the Selectors specs, with selector syntax, category (state/structural/form/etc.), and description.
78 records · updated 2026-10-05
- css-pseudo-elements Code
30 standard CSS pseudo-elements (as of October 2026) with selectors and descriptions, curated from MDN Web Docs.
30 records · updated 2026-10-05
- css-units Code
The 62 standard CSS units by category: absolute/relative lengths, angles, time, frequency, resolution, and flex (fr).
62 records · updated 2026-10-05
- currencies Geo
ISO 4217 currency codes, names, symbols, decimal precision, and the countries that use them.
159 records · updated 2026-10-05
- data-units Code
Decimal (SI) and binary (IEC) data storage units from bit/byte through yottabyte/yobibyte with exact byte counts.
18 records · updated 2026-10-05
- dns-record-types Web
All assigned DNS RR TYPEs from the IANA registry, with numeric value, description, and defining RFC reference.
99 records · updated 2026-10-05
- dom-events Web
Common DOM events with category, interface, bubbling/cancelable flags, and description. Covers mouse, keyboard, touch, form, media, and more.
109 records · updated 2026-10-05
- emoji Web
All 3963 fully-qualified emoji from Emoji 18.0 with glyph, name, group, subgroup, codepoints, and version.
3,963 records · updated 2026-10-05
- emoji-shortcodes Web
GitHub emoji shortcode aliases for 1870 emoji glyphs, with descriptions, categories, and searchable tags from the gemoji database.
1,870 records · updated 2026-10-05
- exit-codes Code
Standard Unix/Linux process exit codes from POSIX, Bash conventions, and BSD sysexits.h, with name, description, and source.
36 records · updated 2026-10-05
- file-signatures Code
Magic-number byte signatures (210 records) for common file formats, with hex pattern, byte offset, and a short description.
210 records · updated 2026-10-05
- greek-alphabet Locale
The 24 letters of the Greek alphabet with uppercase and lowercase glyphs, names, romanization, and LaTeX command.
24 records · updated 2026-10-05
- hash-algorithms Code
Common cryptographic and non-cryptographic hash algorithms with output size, block size, family, publication year, and security status.
36 records · updated 2026-10-05
- html-elements Web
The HTML elements of the WHATWG HTML Living Standard plus well-known obsolete elements, with tag name, description, content categories, void status, and deprecation flag.
145 records · updated 2026-10-05
- html-entities Web
Named HTML character references with their entity name, Unicode codepoints, and rendered glyph.
2,125 records · updated 2026-10-05
- html-attributes Web
HTML global and element-specific attributes with their applicable elements, descriptions, and deprecation status.
150 records · updated 2026-10-05
- input-types Web
All 22 HTML <input> type values with descriptions and relevant attributes, per the HTML Living Standard.
22 records · updated 2026-10-05
- http-auth-schemes Web
All IANA-registered HTTP authentication schemes with their descriptions and RFC references.
14 records · updated 2026-10-05
- http-cache-directives Web
All standard HTTP Cache-Control directives from RFC 9111 with type (request/response/both) and description.
16 records · updated 2026-10-05
- http-content-codings Web
IANA-registered HTTP content coding tokens (e.g. gzip, br, zstd) with descriptions and RFC references.
13 records · updated 2026-10-05
- http-headers Web
Common HTTP request and response headers with direction, description, an example, the defining spec, and deprecation status.
86 records · updated 2026-10-05
- http-methods Web
HTTP request methods with safe, idempotent, and cacheable properties, body semantics, and defining spec.
10 records · updated 2026-10-05
- http-status-codes Web
Every permanently registered HTTP status code in the IANA registry, with category, description, specification, and common causes.
63 records · updated 2026-10-05
- http-versions Web
Major HTTP protocol versions from 0.9 to 3, with year, defining RFC, and a description of key features and improvements.
5 records · updated 2026-10-05
- iframe-sandbox-tokens Web
All allow-* keyword tokens for the HTML iframe sandbox attribute, with descriptions of the capability each token grants.
14 records · updated 2026-10-05
- ip-protocol-numbers Web
Assigned Internet Protocol numbers (the IPv4 Protocol / IPv6 Next Header field) with keyword and reference.
151 records · updated 2026-10-05
- iso-15924 Locale
ISO 15924 four-letter codes and numeric identifiers for writing systems, including Unicode Property Value Aliases.
226 records · updated 2026-10-05
- js-array-methods Code
All Array.prototype methods with signature, return type, mutation flag, description, and ECMAScript version introduced.
38 records · updated 2026-10-05
- js-math-methods Code
All JavaScript Math object methods and constants with their signatures and descriptions, sourced from MDN.
45 records · updated 2026-10-05
- js-object-methods Code
All Object.* static methods from the JavaScript standard library, with name, signature, and description.
23 records · updated 2026-10-05
- js-string-methods Code
The standard JavaScript String.prototype methods plus the String.fromCharCode, fromCodePoint and raw statics, with signature, return type, description, and ECMAScript version introduced.
37 records · updated 2026-10-05
- json-schema-keywords Code
All JSON Schema Draft 2020-12 keywords with applicable instance types and descriptions.
57 records · updated 2026-10-05
- jwt-claims Code
IANA JSON Web Token (JWT) Claims Registry: registered claim names, descriptions, and normative references.
163 records · updated 2026-10-05
- keyboard-event-codes Web
W3C UI Events KeyboardEvent.code values with key label, physical location, and category for every standard key.
184 records · updated 2026-10-05
- language-codes Locale
ISO 639 language codes with English and native names, script, and writing direction.
183 records · updated 2026-10-05
- link-relations Web
All IANA-registered HTTP link relation types with their rel value, description, and normative reference.
134 records · updated 2026-10-05
- llm-models AI
Production language model metadata: id, provider, context window, output limit, prices, capabilities, dates.
45 records · updated 2026-10-05
- mathematical-constants Code
20 fundamental mathematical constants with name, symbol, high-precision decimal value, and a plain-English description.
20 records · updated 2026-10-05
- measurement-units Code
Common measurement units across SI, metric, imperial, and US systems with quantity type and conversion factor to the SI base unit.
169 records · updated 2026-10-05
- media-type-suffixes Web
IANA-registered structured syntax suffixes (e.g. +json, +xml) used in media type subtype names per RFC 6838.
24 records · updated 2026-10-05
- mime-types Web
148 common media types (IANA-registered plus widely used unregistered x- types) with file extensions and descriptions.
148 records · updated 2026-10-05
- months Locale
The 12 months of the Gregorian calendar with number, full name, 3-letter abbreviation, and standard day count.
12 records · updated 2026-10-05
- morse-code Locale
International Morse Code encodings for A–Z, 0–9, and common punctuation, with dot-dash sequences and symbol type.
54 records · updated 2026-10-05
- nato-phonetic-alphabet Locale
The NATO/ICAO phonetic alphabet: letters and digits with their code words, pronunciation, and Morse code.
36 records · updated 2026-10-05
- node-builtin-modules Code
The 43 top-level public Node.js built-in (core) modules with name, description, and stability status, as of Node.js 26 (October 2026).
43 records · updated 2026-10-05
- oauth-grant-types Web
OAuth 2.0 grant types defined by RFC 6749 and extensions, with descriptions, specs, and usage status.
10 records · updated 2026-10-05
- owasp-top-10 Code
The OWASP Top 10 (2021 edition) — the ten most critical web application security risks, with rank, ID, name, and description.
10 records · updated 2026-10-05
- periodic-table Code
All 118 chemical elements with atomic number, symbol, name, atomic mass, category, group, period, phase, and electron configuration.
118 records · updated 2026-10-05
- physical-constants Code
355 NIST CODATA 2022 fundamental physical constants with values, uncertainties, and units.
355 records · updated 2026-10-05
- planets Geo
The 8 planets of the Solar System with type, mass, radius, distance from the Sun, moon count, and orbital period — sourced from NASA.
8 records · updated 2026-10-05
- ports Web
Well-known and popular registered TCP/UDP port numbers with service name and description, from the IANA registry.
711 records · updated 2026-10-05
- posix-signals Code
Standard POSIX/Linux signals with number, default action, description, and whether they can be caught.
31 records · updated 2026-10-05
- programming-languages Code
Languages recognized by GitHub Linguist, with type, file extensions, aliases, and highlight color.
833 records · updated 2026-10-05
- referrer-policies Web
All eight W3C Referrer-Policy directive values with descriptions of their referrer-sending behavior.
8 records · updated 2026-10-05
- regex-flags Code
All JavaScript RegExp flags (d, g, i, m, s, u, v, y) with their single-character identifier, property name, and plain-language description.
8 records · updated 2026-10-05
- regex-patterns Code
Common validation regular expressions indexed by use case, each with examples and a citation to its source.
78 records · updated 2026-10-05
- roman-numerals Code
The 13 base and subtractive Roman numeral symbols used as the building blocks for standard Roman numeral notation (I to M).
13 records · updated 2026-10-05
- si-base-units Code
The 7 SI base units (metre, kilogram, second, ampere, kelvin, mole, candela) with quantity, symbol, and definition.
7 records · updated 2026-10-05
- si-derived-units Code
The 22 named SI derived units with symbol, physical quantity, and expression in SI base units per the BIPM SI Brochure.
22 records · updated 2026-10-05
- si-prefixes Code
The SI metric prefixes from quetta to quecto, with symbol, power of ten, and decimal factor.
24 records · updated 2026-10-05
- spdx-licenses Code
The SPDX License List (v3.29, as of October 2026): identifier, full name, OSI-approval, deprecation status, and reference URL.
740 records · updated 2026-10-05
- ip-special-blocks Web
IANA-registered special-purpose IPv4 and IPv6 address blocks with CIDR, name, RFC reference, scope, and reserved flag.
51 records · updated 2026-10-05
- stock-exchanges Locale
Active ISO 10383 Market Identifier Codes (MIC) with exchange name, country, city, acronym, and website.
2,296 records · updated 2026-10-05
- strftime-tokens Code
All 37 C/POSIX strftime conversion specifiers plus 4 common GNU/BSD extensions, with their meaning and a representative output example.
41 records · updated 2026-10-05
- svg-elements Web
The 63 SVG 2 elements plus 25 obsolete SVG 1.1 and withdrawn draft elements, with category, description, and deprecation status.
88 records · updated 2026-10-05
- tailwind-colors Code
The 22-color default Tailwind CSS v3 palette (as of v3.4) with each color's 50-950 shade hex values.
22 records · updated 2026-10-05
- tcp-flags Web
All 9 TCP control flags (NS/AE, CWR, ECE, URG, ACK, PSH, RST, SYN, FIN) with bit position and description per RFC 9293 and RFC 3168.
9 records · updated 2026-10-05
- time-units Code
Common time units from nanosecond to millennium with their symbols and equivalent duration in seconds.
13 records · updated 2026-10-05
- timezones Time
IANA timezones with country, UTC standard and DST offsets, abbreviations, and alias mappings.
105 records · updated 2026-10-05
- tlds Web
Top-level domains from the ICANN root zone with type, registry, and restriction status.
105 records · updated 2026-10-05
- tls-cipher-suites Web
All IANA-registered TLS cipher suites with hex value, name, recommended status, and RFC reference.
356 records · updated 2026-10-05
- tls-versions Web
SSL and TLS protocol versions from SSL 2.0 to TLS 1.3, with year, defining RFC, and deprecation status.
6 records · updated 2026-10-05
- unicode-blocks Code
Every named Unicode block with its start and end codepoints, from the Unicode Character Database.
353 records · updated 2026-10-05
- unicode-general-categories Code
The 30 Unicode general categories (Lu, Ll, Nd, …) with their full names and major group (Letter, Mark, Number, etc.).
30 records · updated 2026-10-05
- unicode-planes Code
All 17 Unicode planes (0–16) with plane number, name, codepoint range, and description of contents.
17 records · updated 2026-10-05
- unix-file-permissions Code
All 8 octal permission digit values (0–7) with symbolic rwx notation and individual read, write, and execute boolean flags.
8 records · updated 2026-10-05
- uri-schemes Web
All URI schemes registered with IANA, including permanent, provisional, and historical entries with status and reference.
435 records · updated 2026-10-05
- us-states Geo
All 50 US states plus DC and 5 territories with 2-letter code, capital, statehood year, and type.
56 records · updated 2026-10-05
- weekdays Locale
ISO 8601 weekdays (Monday=1 through Sunday=7) with full name, 3-letter abbreviation, and 2-letter short form.
7 records · updated 2026-10-05
- well-known-uris Web
IANA-registered well-known URI suffixes used under /.well-known/ for service discovery, security policies, and protocol negotiation.
105 records · updated 2026-10-05
- xterm-256-colors Code
The full xterm 256-color terminal palette with id (0-255), hex, RGB triplet, and color name.
256 records · updated 2026-10-05
- zodiac-signs Locale
The 12 Western astrological zodiac signs with Unicode glyph, element, modality, and MM-DD date range.
12 records · updated 2026-10-05