Free Public APIs & Interactive Sandbox
Curated directory of free web services with live testing directly in your browser. Execute fetch(), copy cURL commands, and integrate into projects in seconds.
🌐 Directory of 87 Public APIs (Zero-Auth & Zero-Cost)
Click "Test GET" to run a live query directly in your browser and view the JSON response.
Jina AI Reader (URL to Markdown)
Convert any web page into clean, LLM-ready markdown without cookies, ads or navigation bloat.
fetch("https://r.jina.ai/https://example.com")
.then(r => r.text())
.then(md => console.log("Clean Markdown:", md.slice(0, 200))); DuckDuckGo Instant Answer API
Instant search answers, entity definitions, and related topics from DuckDuckGo index.
fetch("https://api.duckduckgo.com/?q=linux&format=json&no_html=1")
.then(r => r.json())
.then(data => console.log("Answer:", data.AbstractText)); Hacker News Algolia Search API
Search top Hacker News stories, AI breakthroughs, and developer discussions via Algolia.
fetch("https://hn.algolia.com/api/v1/search?query=AI&tags=story&hitsPerPage=3")
.then(r => r.json())
.then(d => console.log("Top Stories:", d.hits.map(h => h.title))); Hugging Face Model Hub API
Public model cards, download metrics, and tags for top AI weights on Hugging Face.
fetch("https://huggingface.co/api/models?sort=downloads&direction=-1&limit=3")
.then(r => r.json())
.then(models => console.log("Top Models:", models.map(m => m.id))); Wikipedia Summary REST API
Structured Wikipedia page summaries, lead paragraphs, and thumbnails for knowledge bases.
fetch("https://ru.wikipedia.org/api/rest_v1/page/summary/Москва")
.then(r => r.json())
.then(wiki => console.log("Extract:", wiki.extract)); CoinGecko Simple Price API
Real-time spot prices for BTC, ETH, TON, and SOL in fiat currencies.
fetch("https://api.coingecko.com/api/v3/simple/price?ids=bitcoin,the-open-network&vs_currencies=usd,rub")
.then(r => r.json())
.then(data => console.log("BTC:", data.bitcoin.usd, "TON:", data['the-open-network'].usd)); Binance Spot Ticker Price
Live crypto market price streams direct from Binance exchange books without authentication.
fetch("https://api.binance.com/api/v3/ticker/price?symbol=BTCUSDT")
.then(r => r.json())
.then(t => console.log("BTC/USDT:", t.price)); Blockchain.info Bitcoin Ticker
Official Bitcoin currency ticker from Blockchain.com with rates across 30+ fiat currencies.
fetch("https://blockchain.info/ticker")
.then(r => r.json())
.then(rates => console.log("BTC USD 15m:", rates.USD['15m'])); ЦБ РФ Курсы валют (CBR Daily)
Official daily exchange rates from the Central Bank of Russia (CBR) in clean JSON format.
fetch("https://www.cbr-xml-daily.ru/daily_json.js")
.then(r => r.json())
.then(data => console.log("USD:", data.Valute.USD.Value, "EUR:", data.Valute.EUR.Value)); Frankfurter Exchange Rates API (ECB)
Free and open-source currency rates tracked by the European Central Bank. Zero auth required.
fetch("https://api.frankfurter.app/latest?from=USD&to=EUR,GBP")
.then(r => r.json())
.then(res => console.log("EUR:", res.rates.EUR)); Fawazahmed0 Currency API (CDN)
Decentralized open exchange rates repository served via global jsDelivr edge CDN.
fetch("https://cdn.jsdelivr.net/npm/@fawazahmed0/currency-api@latest/v1/currencies/usd.json")
.then(r => r.json())
.then(res => console.log("USD->EUR:", res.usd.eur)); ExchangeRate-API Open
Reliable free tier open forex rates for multi-currency converters and finance apps.
fetch("https://open.er-api.com/v6/latest/USD")
.then(r => r.json())
.then(res => console.log("Rates loaded:", Object.keys(res.rates).length)); НБ РБ Курсы валют (Национальный банк)
National Bank of the Republic of Belarus official currency quotations in structured JSON.
fetch("https://api.nbrb.by/exrates/rates?periodicity=0")
.then(r => r.json())
.then(rates => console.log("Total rates:", rates.length)); Cloudflare 1.1.1.1 DNS-over-HTTPS (DoH)
Resolve DNS queries (A, AAAA, TXT, MX) securely via HTTPS returning RFC 8427 JSON records.
fetch("https://cloudflare-dns.com/dns-query?name=google.com&type=A", { headers: { Accept: "application/dns-json" } })
.then(r => r.json())
.then(dns => console.log("DNS Answers:", dns.Answer)); HaveIBeenPwned Passwords Range API
Check if passwords have appeared in data breaches using k-anonymity SHA-1 hash prefixes.
fetch("https://api.pwnedpasswords.com/range/21BD1")
.then(r => r.text())
.then(hashes => console.log("Prefix matches:", hashes.split("\n").slice(0, 3))); ipapi.co IP Geolocation
Geolocation lookup for client IP: country, city, coordinates, ASN, and currency.
fetch("https://ipapi.co/json/")
.then(r => r.json())
.then(geo => console.log("Country:", geo.country_name, "City:", geo.city)); ipify Public IP API
Simple and ultra-fast public IP address lookup in JSON or plain text format.
fetch("https://api.ipify.org?format=json")
.then(r => r.json())
.then(res => console.log("Your Public IP:", res.ip)); HTTPBin Mock & Testing
HTTP request & response service for inspecting client headers, IP, and method payloads.
fetch("https://httpbin.org/anything")
.then(r => r.json())
.then(res => console.log("Client Origin:", res.origin)); JSONPlaceholder Fake REST API
Industry standard mock REST backend for testing frontend fetch logic, CRUD, and state.
fetch("https://jsonplaceholder.typicode.com/posts/1")
.then(r => r.json())
.then(post => console.log("Post Title:", post.title)); DummyJSON E-Commerce REST API
Full-featured fake store data: products with images, carts, users, posts, and auth mock.
fetch("https://dummyjson.com/products/1")
.then(r => r.json())
.then(prod => console.log("Product:", prod.title, "$" + prod.price)); DiceBear Avatars Generator
Deterministic SVG avatar generator by seed string (bottts, identicons, adventurer, personas).
fetch("https://api.dicebear.com/7.x/bottts/svg?seed=VaultPRO")
.then(r => r.text())
.then(svg => console.log("SVG Length:", svg.length)); QR Server Generator API
Instant QR code generation in vector SVG or PNG raster format from any text or URL.
const qrUrl = "https://api.qrserver.com/v1/create-qr-code/?size=150x150&data=" + encodeURIComponent("https://vault-pro.rashid-salimov96.workers.dev");
console.log("QR Image:", qrUrl); ReqRes Mock User Directory
Mock user API supporting pagination, simulated latency, and response code testing.
fetch("https://reqres.in/api/users?page=1")
.then(r => r.json())
.then(res => console.log("Users:", res.data.map(u => u.first_name))); Lorem Picsum Photos
Placeholder images and photography metadata for rapid web mockup and frontend design.
fetch("https://picsum.photos/v2/list?page=1&limit=3")
.then(r => r.json())
.then(photos => console.log("Photos:", photos.map(p => p.download_url))); Open Library Books API
Open catalog of world books, bibliographic records, covers, and author biographies.
fetch("https://openlibrary.org/api/books?bibkeys=ISBN:0451526538&format=json&jscmd=data")
.then(r => r.json())
.then(book => console.log("Book Data:", book)); NASA Astronomy Picture of the Day (APOD)
Daily high-resolution space photographs and astronomical descriptions curated by NASA.
fetch("https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY")
.then(r => r.json())
.then(data => console.log("Space Photo:", data.title, data.url)); PokéAPI Universal Database
Exhaustive Pokémon entity database: moves, stats, high-res sprites, and game generations.
fetch("https://pokeapi.co/api/v2/pokemon/pikachu")
.then(r => r.json())
.then(p => console.log("Pokemon:", p.name, "Height:", p.height)); Art Institute of Chicago API
Public domain artwork records, artists, exhibitions, and digital imagery from AIC.
fetch("https://api.artic.edu/api/v1/artworks/129884")
.then(r => r.json())
.then(art => console.log("Artwork:", art.data.title, art.data.artist_title)); REST Countries v3.1
Complete geographic database of 250 sovereign countries, SVG flags, currencies, and codes.
fetch("https://restcountries.com/v3.1/name/kazakhstan")
.then(r => r.json())
.then(c => console.log("Capital:", c[0].capital[0], "Currencies:", Object.keys(c[0].currencies))); Open-Meteo Weather API
Accurate open-source weather forecast API. Hourly temperature, wind, and rain without API keys.
fetch("https://api.open-meteo.com/v1/forecast?latitude=55.75&longitude=37.61¤t_weather=true")
.then(r => r.json())
.then(data => console.log("Weather:", data.current_weather)); National Weather Service (weather.gov)
US Government meteorological forecasts, radar observation grids, and weather alert feeds.
fetch("https://api.weather.gov/points/39.7456,-97.0892")
.then(r => r.json())
.then(data => console.log("Grid Forecast URL:", data.properties.forecast)); Sunrise & Sunset Times API
Astronomical solar calculation for sunrise, sunset, dawn, and dusk by geographic coordinates.
fetch("https://api.sunrise-sunset.org/json?lat=55.7558&lng=37.6173&formatted=0")
.then(r => r.json())
.then(solar => console.log("Sunrise UTC:", solar.results.sunrise)); Cat Facts API
Curated facts about feline biology and animal history in clean lightweight JSON.
fetch("https://catfact.ninja/fact")
.then(r => r.json())
.then(data => console.log("Cat Fact:", data.fact)); JokeAPI Programming & Tech Humor
Developer and IT jokes with strict content filters, safe mode, and programming categories.
fetch("https://v2.jokeapi.dev/joke/Programming?safe-mode")
.then(r => r.json())
.then(j => console.log("Joke:", j.joke || (j.setup + " -> " + j.delivery))); Datamuse Linguistics API
Linguistic search engine for finding words with similar meaning, synonyms, and rhymes.
fetch("https://api.datamuse.com/words?rel_syn=fast&max=3")
.then(r => r.json())
.then(words => console.log("Synonyms:", words.map(w => w.word))); Wiktionary Lexicon REST API
Collaborative multilingual dictionary offering definitions, etymology, and pronunciations.
fetch("https://en.wiktionary.org/w/api.php?action=query&titles=hello&prop=extracts&format=json")
.then(r => r.json())
.then(d => console.log("Wiktionary Pages:", Object.keys(d.query.pages))); GitHub REST API
Official GitHub API to query repository stars, releases, and commits without authentication.
fetch("https://api.github.com/repos/octocat/Hello-World")
.then(r => r.json())
.then(repo => console.log("Stars:", repo.stargazers_count, "Forks:", repo.forks_count)); npm Package Registry API
Official npm metadata registry for inspect package versions, dependencies, and license info.
fetch("https://registry.npmjs.org/express/latest")
.then(r => r.json())
.then(pkg => console.log("Latest Express:", pkg.version, "License:", pkg.license)); PyPI Python Packages API
JSON API for Python Package Index to fetch version history, summary, and download URLs.
fetch("https://pypi.org/pypi/requests/json")
.then(r => r.json())
.then(data => console.log("PyPI Version:", data.info.version, data.info.summary)); Rust Crates.io Registry
Rust community crate registry API for crate versions, downloads, and documentation metadata.
fetch("https://crates.io/api/v1/crates/serde", { headers: { "User-Agent": "VaultPRO" } })
.then(r => r.json())
.then(c => console.log("Crate:", c.crate.name, "Downloads:", c.crate.downloads)); cdnjs CDN Libraries API
Global frontend library asset catalog powered by Cloudflare with CDN asset URLs.
fetch("https://api.cdnjs.com/libraries/jquery?fields=version,description")
.then(r => r.json())
.then(lib => console.log("CDN Lib:", lib.name, lib.version)); Docker Hub Registry API
Query public Docker image repositories, official badges, pull counts, and descriptions.
fetch("https://hub.docker.com/v2/repositories/library/nginx/")
.then(r => r.json())
.then(d => console.log("Docker Pulls:", d.pull_count, "Stars:", d.star_count)); GitLab Projects API
GitLab REST API endpoint for exploring public open-source code repositories.
fetch("https://gitlab.com/api/v4/projects?per_page=1")
.then(r => r.json())
.then(p => console.log("Project:", p[0].name_with_namespace)); Postman Echo Service
Official Postman echo utility for debugging query parameters, client headers, and payloads.
fetch("https://postman-echo.com/get?vault=pro")
.then(r => r.json())
.then(res => console.log("Echo args:", res.args)); FakeStoreAPI E-Commerce Mock
Mock shopping store backend returning products with prices, ratings, categories, and image URLs.
fetch("https://fakestoreapi.com/products/1")
.then(r => r.json())
.then(p => console.log("Product:", p.title, "$" + p.price)); RandomUser.me User Generator
Free API for generating placeholder user data complete with portrait photos, address, and credentials.
fetch("https://randomuser.me/api/")
.then(r => r.json())
.then(u => console.log("Random User:", u.results[0].name.first, u.results[0].email)); Bacon Ipsum Text Generator
Humorous meat-themed placeholder text generator API for rapid layout wireframing.
fetch("https://baconipsum.com/api/?type=meat-and-filler¶s=1")
.then(r => r.json())
.then(text => console.log("Bacon Paragraph:", text[0].slice(0, 100))); Deck of Cards API
Playing card deck simulation API with shuffle, draw card, and pile tracking capabilities.
fetch("https://deckofcardsapi.com/api/deck/new/shuffle/?deck_count=1")
.then(r => r.json())
.then(deck => console.log("Deck ID:", deck.deck_id, "Remaining:", deck.remaining)); Coinbase Spot Price API
Real-time spot cryptocurrency pricing direct from Coinbase exchange public market feed.
fetch("https://api.coinbase.com/v2/prices/spot?currency=USD")
.then(r => r.json())
.then(p => console.log("Coinbase BTC:", "$" + p.data.amount)); Kraken Public Ticker
Kraken public market data feed returning live bid/ask, 24h volume, and last trade price.
fetch("https://api.kraken.com/0/public/Ticker?pair=XBTUSD")
.then(r => r.json())
.then(data => console.log("Kraken XBT/USD:", data.result.XXBTZUSD.c[0])); Mempool.space Bitcoin Network API
Live Bitcoin mempool analytics, recommended transaction fee rates (sat/vB), and block difficulty.
fetch("https://mempool.space/api/v1/fees/recommended")
.then(r => r.json())
.then(fees => console.log("Fastest Fee:", fees.fastestFee, "sat/vB")); CoinPaprika Global Crypto API
Global crypto market data covering market caps, circulating supply, volume, and ATH stats.
fetch("https://api.coinpaprika.com/v1/tickers/btc-bitcoin")
.then(r => r.json())
.then(t => console.log("BTC Cap:", "$" + t.quotes.USD.market_cap)); Bitcoin Halving Schedule API
Deterministic Bitcoin halving arithmetic: block subsidy, reward era, and block countdowns.
fetch("https://why21million.com/halving-api/")
.then(r => r.json())
.then(h => console.log("Subsidy:", h.current_block_subsidy, "BTC")); Economia AwesomeAPI Rates
High-speed real-time foreign exchange quotation endpoints without authentication walls.
fetch("https://economia.awesomeapi.com.br/last/USD-BRL")
.then(r => r.json())
.then(res => console.log("USD/BRL:", res.USDBRL.bid)); BigDataCloud Client IP API
Fast client IP resolution returning public IPv4/IPv6 address and country code.
fetch("https://api.bigdatacloud.net/data/client-ip")
.then(r => r.json())
.then(ip => console.log("Client IP:", ip.ipString)); IPWhois Geolocation & ASN
IP geolocation lookup with autonomous system number (ASN), ISP name, coordinates, and timezone.
fetch("https://ipwhois.app/json/")
.then(r => r.json())
.then(geo => console.log("ISP:", geo.isp, "Country:", geo.country)); Disify Disposable Email Detector
Instant email verification identifying disposable inboxes, MX validity, and domain typos.
fetch("https://www.disify.com/api/email/test@example.com")
.then(r => r.json())
.then(res => console.log("Is Disposable:", res.disposable)); OpenStreetMap Nominatim Geocoding
OpenStreetMap geocoding engine to convert address queries into geographic coordinates (lat/lon).
fetch("https://nominatim.openstreetmap.org/search?q=Paris&format=json&limit=1", { headers: { "User-Agent": "VaultPRO" } })
.then(r => r.json())
.then(geo => console.log("Coords:", geo[0].lat, geo[0].lon)); Open-Meteo City Geocoding
High-speed global city geocoding API providing coordinates, elevation, and timezone offsets.
fetch("https://geocoding-api.open-meteo.com/v1/search?name=Rome&count=1")
.then(r => r.json())
.then(city => console.log("City:", city.results[0].name, city.results[0].country)); Zippopotam.us Postal Codes
Free postal code database lookup returning city, state, and coordinates for multiple countries.
fetch("https://api.zippopotam.us/us/10001")
.then(r => r.json())
.then(zip => console.log("Place:", zip.places[0]['place name'], zip.places[0].state)); FlagCDN Country Flags & ISO Codes
Comprehensive database of ISO 3166-1 country codes with high-res SVG and PNG flag assets.
fetch("https://flagcdn.com/en/codes.json")
.then(r => r.json())
.then(codes => console.log("Total countries:", Object.keys(codes).length)); CityBikes Global Bike Sharing
Real-time bike sharing network availability and station coordinates across 400+ world cities.
fetch("http://api.citybik.es/v2/networks?fields=id,name,location")
.then(r => r.json())
.then(d => console.log("CityBikes Networks:", d.networks.length)); Nager.Date Public Holidays
Worldwide public holiday calendar database covering national and regional bank holidays.
fetch("https://date.nager.at/api/v3/PublicHolidays/2026/US")
.then(r => r.json())
.then(h => console.log("US Holidays 2026:", h.length)); TimeAPI.io Accurate Timezone API
Accurate current time, date, day of week, and timezone offsets by timezone identifier.
fetch("https://timeapi.io/api/Time/current/zone?timeZone=UTC")
.then(r => r.json())
.then(t => console.log("Current UTC Time:", t.dateTime)); USGS Earthquakes GeoJSON
Real-time global seismic observation feed curated by US Geological Survey returning GeoJSON.
fetch("https://earthquake.usgs.gov/fdsnws/event/1/query?format=geojson&limit=1")
.then(r => r.json())
.then(eq => console.log("Recent Quake:", eq.features[0].properties.title)); wttr.in Weather Service
Lightweight weather service delivering formatted JSON reports, moon phases, and cloud cover.
fetch("https://wttr.in/Moscow?format=j1")
.then(r => r.json())
.then(w => console.log("Temp C:", w.current_condition[0].temp_C, "Desc:", w.current_condition[0].weatherDesc[0].value)); OpenAlex Scholarly Knowledge Graph
Index of 250M+ scholarly research papers, author citations, and open-access scientific literature.
fetch("https://api.openalex.org/works/W2741809807")
.then(r => r.json())
.then(paper => console.log("Paper:", paper.title, "Citations:", paper.cited_by_count)); CrossRef Academic DOI Resolver
Official digital object identifier (DOI) search endpoint for academic journals and citations.
fetch("https://api.crossref.org/works/10.1038/nature12373")
.then(r => r.json())
.then(work => console.log("Title:", work.message.title[0])); World Bank Open Indicators
Sovereign economic and demographic indicators curated by World Bank: GDP, population, and inflation.
fetch("https://api.worldbank.org/v2/country/DEU/indicator/SP.POP.TOTL?format=json")
.then(r => r.json())
.then(d => console.log("Population:", d[1][0].value, "Year:", d[1][0].date)); World Universities Directory
Global registry of higher education institutions, verified web domains, and country locations.
fetch("http://universities.hipolabs.com/search?name=Harvard")
.then(r => r.json())
.then(u => console.log("University:", u[0].name, u[0].domains)); Agify.io Age Estimation
Predicts the statistically probable age of a person based on their given first name.
fetch("https://api.agify.io?name=david")
.then(r => r.json())
.then(res => console.log("Estimated Age for David:", res.age)); Genderize.io Name Classifier
Determines the likely gender of a first name backed by global demographic registration datasets.
fetch("https://api.genderize.io?name=anna")
.then(r => r.json())
.then(res => console.log("Gender:", res.gender, "Probability:", res.probability)); Nationalize.io Nationality Detector
Estimates the country of origin distribution for a given surname or personal name.
fetch("https://api.nationalize.io?name=smith")
.then(r => r.json())
.then(res => console.log("Top Country:", res.country[0].country_id)); Metropolitan Museum of Art API
Public domain open collection access to 470,000+ artwork records from The Met Museum.
fetch("https://collectionapi.metmuseum.org/public/collection/v1/objects/436535")
.then(r => r.json())
.then(art => console.log("Artwork:", art.title, art.artistDisplayName)); Radio Browser Community Directory
Community-driven directory of 30,000+ online radio stations with live streaming audio endpoints.
fetch("https://de1.api.radio-browser.info/json/stations/topclick/1")
.then(r => r.json())
.then(s => console.log("Station:", s[0].name, s[0].url_resolved)); Bible-API Multilingual Text
Public text API returning chapters and individual verses across multiple world language translations.
fetch("https://bible-api.com/john+3:16")
.then(r => r.json())
.then(b => console.log("Verse:", b.text.trim())); TheMealDB Recipes & Cooking
Open cooking recipe catalog providing ingredients, step-by-step instructions, and video links.
fetch("https://www.themealdb.com/api/json/v1/1/random.php")
.then(r => r.json())
.then(m => console.log("Recipe:", m.meals[0].strMeal, "Category:", m.meals[0].strCategory)); TheCocktailDB Drink Recipes
Crowdsourced database of drink and cocktail recipes, glassware, and measurement proportions.
fetch("https://www.thecocktaildb.com/api/json/v1/1/random.php")
.then(r => r.json())
.then(c => console.log("Cocktail:", c.drinks[0].strDrink, c.drinks[0].strGlass)); Open Brewery Directory
Public database of craft breweries, cideries, brewpubs, and tasting room locations.
fetch("https://api.openbrewerydb.org/v1/breweries/random")
.then(r => r.json())
.then(b => console.log("Brewery:", b[0].name, b[0].city)); Open Trivia Database
Community-driven quiz database with multiple choice trivia questions across 24 categories.
fetch("https://opentdb.com/api.php?amount=1")
.then(r => r.json())
.then(q => console.log("Question:", q.results[0].question)); chucknorris.io Facts & Jokes
Curated JSON API delivering humorous facts and jokes categorized by topic.
fetch("https://api.chucknorris.io/jokes/random")
.then(r => r.json())
.then(j => console.log("Joke:", j.value)); Bored Activity Suggestions
Activity idea generator to cure boredom filtered by participants, price, and category.
fetch("https://bored-api.appbrewery.com/random")
.then(r => r.json())
.then(a => console.log("Activity:", a.activity, "Type:", a.type)); Dog CEO Dog Breeds API
Open canine database serving random and breed-filtered high-resolution dog photos.
fetch("https://dog.ceo/api/breeds/image/random")
.then(r => r.json())
.then(d => console.log("Dog Photo:", d.message)); The Cat API Photo Feed
Public photo endpoint delivering cat images and breed information in clean JSON.
fetch("https://api.thecatapi.com/v1/images/search")
.then(r => r.json())
.then(c => console.log("Cat Photo:", c[0].url)); Imgflip Popular Memes Directory
Catalog of top 100 viral internet meme templates with dimensions and direct image URLs.
fetch("https://api.imgflip.com/get_memes")
.then(r => r.json())
.then(m => console.log("Top Meme:", m.data.memes[0].name, m.data.memes[0].url)); Star Wars API (swapi.info)
Maintained, fast mirror of Star Wars knowledge database: heroes, starships, and planets.
fetch("https://swapi.info/api/people/1")
.then(r => r.json())
.then(p => console.log("Character:", p.name, "Homeworld:", p.homeworld)); Rick and Morty API
RESTful universe guide covering characters, dimensions, and episodes from Rick and Morty.
fetch("https://rickandmortyapi.com/api/character/1")
.then(r => r.json())
.then(c => console.log("Character:", c.name, "Status:", c.status)); 🚦 HTTP Status Codes Reference
Concise descriptions of 2xx, 3xx, 4xx, and 5xx response codes per RFC 9110 and MDN Web Docs.
Request succeeded. The payload sent depends on the request method.
Request succeeded and a new resource was created as a result.
Target resource has been assigned a new permanent URI. Transfers SEO equity.
Target resource resides temporarily under a different URI.
Server cannot process request due to client error, malformed syntax, or invalid parameters.
Authentication is required and has failed or has not yet been provided.
Server understood the request but refuses to authorize access.
Server cannot find the requested resource or endpoint.
User has sent too many requests in a given amount of time (Rate Limited).
Server encountered an unexpected condition that prevented it from fulfilling the request.
Server, while acting as a gateway or proxy, received an invalid upstream response.
Server is temporarily unavailable due to overload or maintenance.
🔤 Production-Ready Regular Expressions (Regex)
Verified patterns for signup forms, email syntax, phone numbers, and unique identifiers.
Standard RFC 5322 email syntax validation
^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$ Global E.164 international telephone number format
^\+[1-9]\d{1,14}$ Validates standard http and https web URLs
^https?:\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b(?:[-a-zA-Z0-9()@:%_\+.~#?&\/=]*)$ Strict dotted-quad IPv4 address format
^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$ ISO 8601 standard calendar date
^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$ Version 4 universally unique identifier
^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$ 🐧 Linux Permissions Cheatsheet (Chmod)
Standard octal permission presets for Nginx, Apache, SSH keys, and server automation.
Scripts and directories. Owner: read/write/execute, Others: read/execute.
Web server files (HTML, CSS, JS). Owner: read/write, Others: read only.
Private SSH keys (id_rsa), SSL certificates, and .env secrets.
Private user directories (e.g. ~/.ssh). Restricted strictly to owner.
Full access to everyone. Insecure in production environments.
🐙 Git Emergency Cheatsheet
Essential commands to safely undo actions and manage uncommitted work in repositories.
git reset --soft HEAD~1 git reset --hard HEAD~1 git commit --amend -m "New message" git stash git stash pop git rm --cached <file> Open-Weights AI Models for Local Inference
Run top-tier reasoning and foundation models locally on your hardware via Ollama or vLLM.
State-of-the-art chain-of-thought reasoning model. Matches and exceeds OpenAI o1-mini in math & coding.
ollama run deepseek-r1:8b Flagship open weights model by Meta featuring 128k context window and industry-leading instruction following.
ollama run llama3.3 Ultra-fast photorealistic 4-step image synthesis model created by the original Black Forest Labs team.
diffusers / ComfyUI