Ready-to-run examples for 63 small, fast JSON APIs — QR codes, IP and DNS lookups, public holidays, currency rates, HTML table extraction, SEO audits, converters and more. Every API has a free plan.
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sh examples/curl/qr-code-generator.shorpython examples/python/public-holidays.py.
| API | What it does | OpenAPI |
|---|---|---|
| Airport Data API (9,500 airports, IATA/ICAO, distance) | Airport lookup by IATA or ICAO code, search by name or city, nearest airports to any coordinates and great-circle distance and flight time between two airports. | spec |
| Barcode Generator (Code 128, EAN-13) SVG | Generate scannable Code 128 and EAN-13 barcodes as crisp SVG, with automatic check digit, custom height and bar width. | spec |
| Business Days Calculator (holidays aware) | Count working days between two dates and add/subtract business days, skipping weekends and the public holidays of 100+ countries and regions. | spec |
| World Calendar Converter API - Islamic Hebrew Chinese | Convert dates between 13 calendars (Gregorian, Islamic Umm al-Qura and tabular, Hebrew, Persian, Chinese, Korean, Japanese, Buddhist, Indian, Coptic, Ethiopian, Minguo) and get the dates of Islamic, Jewish, Chinese and Persian holidays for any year 1900-2100. | spec |
| Reverse Geocoding and City Search API | Fast city-level geocoding for 171,000 places worldwide: reverse geocoding (coordinates to nearest town, region, country and time zone), place search by name and nearby places within a radius. | spec |
| Color Converter, Palettes & Contrast Checker | Convert colors between HEX, RGB, HSL and CMYK, get complementary, analogous, triadic palettes, shades and tints, the best text color and WCAG contrast ratio. | spec |
| Company Logo API | Get any company's logo and icon from its domain: best square icon at your size, full logo, brand color and site name, or the image itself. | spec |
| Country Data (250 countries, flags, currencies) | All countries with ISO codes, names in any language, native name, capital, continent, calling codes, currencies, languages and emoji flag. | spec |
| Currency Exchange Rates (ECB, 30+ currencies) | Daily euro foreign exchange reference rates for 30+ currencies, any base currency, conversion and history of the last 90 days. | spec |
| Distance Calculator API | Distance between any two places: coordinates, cities ("Paris, FR") or airport codes (MAD, JFK). | spec |
| DNS Lookup (A, AAAA, MX, NS, TXT, CNAME, SOA, CAA) | Look up DNS records of any domain in one call: A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, SRV. | spec |
| DNS Propagation Checker (6 global resolvers) | Check if a DNS change has propagated: queries Cloudflare, Google, AdGuard, NextDNS, AliDNS and DNS.SB at once and reports agreement, consensus answer and response times. | spec |
| Domain Availability API | Check if domain names are available across many extensions in one call, using each registry's official RDAP data (with DNS fallback). | spec |
| Domain Info & Availability (WHOIS/RDAP) | Is a domain registered? Who is the registrar, when was it created, when does it expire, how old is it, its status and nameservers. | spec |
| Emoji Search API - 6 Languages Shortcodes | Search all 1,949 emojis (Emoji 17) by keyword in 6 languages and get names, keywords, category, shortcodes, codepoints and HTML entities. | spec |
| English Dictionary API - Definitions Synonyms Rhymes | English dictionary with 147,000 words: definitions by part of speech, usage examples, synonyms, antonyms, broader terms, IPA and ARPAbet pronunciation, syllable count, rhymes and prefix autocomplete. | spec |
| Favicon & Website Icon Finder | Find all icons of a website (favicon.ico, PNG/SVG icons, Apple touch icons, manifest icons) with sizes, sorted from best to smallest. | spec |
| Hash Generator API - MD5 SHA256 HMAC CRC32 | Hash any text with MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32 in one call, sign messages with HMAC, and identify which algorithm produced a given hash. | spec |
| Health Calculator API - BMI Calories Macros | Health and fitness calculators: BMI with category and healthy weight range, BMR, daily calories (TDEE) with lose/maintain/gain targets, macros, ideal weight (4 formulas) and body fat (U.S. | spec |
| HTML Table Extractor (to JSON or CSV) | Turn the HTML tables of any web page into clean JSON (rows or objects with headers) or download a table as CSV. | spec |
| IBAN Validator & Parser (80+ countries) | Validate any IBAN (checksum, length, country format, national check digits) and split it into bank code, branch code and account number. | spec |
| Initials Avatar API | Generate clean initials avatars (SVG) from any name: deterministic brand colors, circle, rounded or square, custom colors and sizes. | spec |
| IP Lookup (owner, network, country) + My IP | Who owns an IP address: network name, range, CIDR, organization, country and registration date from the Regional Internet Registries (RDAP). | spec |
| JSON to CSV & CSV to JSON Converter | Convert JSON arrays (nested objects flattened) to CSV and CSV to JSON with auto delimiter detection, quoted fields and numbers. | spec |
| Keyword Extraction API | Extract the key phrases and most frequent words of any text in 50+ languages (RAKE algorithm with language stopwords). | spec |
| Language Detection (180+ languages) | Detect the language of any text: ISO 639-3 code, English name, confidence, reliability flag and top 5 candidates. | spec |
| Link Extractor (internal & external links of a page) | Extract every link of a web page with anchor text, rel, nofollow flag and internal/external classification. | spec |
| Link Preview & Metadata (Open Graph, Twitter Card, favicon) | Everything you need to build link previews: title, description, image, favicon, site name, language, canonical URL, author, publish time, Twitter card and optional JSON-LD. | spec |
| Loan & Mortgage Calculator API | Monthly payment, total interest and full amortization schedule for loans and mortgages. | spec |
| Lorem Ipsum Generator API (paragraphs, sentences, HTML) | Generate lorem ipsum placeholder text as paragraphs, sentences, words, list items or titles, in JSON, plain text or ready-to-paste HTML. | spec |
| Markdown to HTML Converter | Convert GitHub-flavored Markdown (tables, lists, code) to safe HTML. | spec |
| Number to Words API | Convert numbers and money amounts to words in English, Spanish, French, German, Portuguese and Italian. | spec |
| Nutrition Facts API (USDA, 7,700 foods, calories, macros) | Search 7,793 generic foods and get calories, protein, fat, carbohydrates, fiber, sugars, vitamins and minerals (36 nutrients) per 100 g or for any amount, with common portion sizes (cup, slice, piece). | spec |
| Secure Password & UUID Generator | Cryptographically secure random passwords (length, symbols, numbers, uppercase, entropy) and UUID v4, in bulk. | spec |
| PDF & Invoice Generator | Create PDF documents from text or professional invoices from JSON (items, quantities, prices, tax, totals) in milliseconds. | spec |
| Placeholder Image Generator (SVG) | Instant placeholder images of any size with custom background, text color and label. | spec |
| Postal Code API - 121 Countries ZIP Lookup | Postal code lookup for 121 countries and 1.8 million codes: place name, region, province, coordinates; distance between two postal codes; and postal code validation. | spec |
| Profanity Filter API (detect & censor bad words, 25+ languages) | Detect and censor profanity and offensive words in user-generated text. | spec |
| Public Holidays API (100+ countries, regions) | Public and bank holidays for 100+ countries and their states/regions, any year, localized names, plus 'is this date a holiday?' check. | spec |
| QR Code Generator (SVG, colors, fast) | Fast QR codes as crisp SVG: any text or link, custom size, colors, margin and error correction. | spec |
| Random Data Generator API - Users Products JSON | Realistic random data for development, demos and seeding databases: users, addresses, companies, products, blog posts and transactions in 6 languages, or your own JSON schema. | spec |
| Readability Score API (Flesch, Gunning Fog, SMOG, Spanish) | Readability metrics for any text: Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau, ARI and LIX for English, plus Fernandez-Huerta and Szigriszt-Pazos (INFLESZ scale) for Spanish. | spec |
| Rhymes & Syllables API | Rhymes, syllable counts and pronunciation for English words, plus syllable counting for whole texts (per word and per line, with haiku detection). | spec |
| Robots.txt Checker (is this URL allowed?) | Check whether a URL may be crawled according to the site's robots.txt for any user agent, with the matching rule, sitemaps and crawl-delay. | spec |
| Security Headers Checker (grade A+ to F) | Check the HTTP security headers of any website (HSTS, CSP, X-Frame-Options, Referrer-Policy, Permissions-Policy...) with a score, a grade and fixes to apply. | spec |
| Sentiment Analysis API | Fast English sentiment analysis: positive, negative or neutral label, a -1 to +1 score and per-sentence results. | spec |
| SEO Page Audit (on-page score) | On-page SEO audit of any URL in one call: score 0-100 and a clear list of issues (title, meta description, H1, canonical, noindex, alt texts, lang, viewport, Open Graph, thin content, speed, HTTPS). | spec |
| Sitemap URL Extractor | Get all URLs of a website from its sitemaps (found via robots.txt), following sitemap indexes and .gz files, with lastmod, priority and changefreq. | spec |
| Spell Check API | Fast English spell checker (US and UK): flags misspellings with ranked suggestions, offsets and an auto-corrected text. | spec |
| Sunrise Sunset & Moon Phase API (twilight, golden hour) | Sunrise, sunset, solar noon, day length, civil/nautical/astronomical twilight and golden hour for any coordinates and date, plus moon phase, illumination, moonrise/moonset and next full and new moon. | spec |
| Synonyms API - Thesaurus | English thesaurus: synonyms, antonyms and related words for 147,000 words, ranked and grouped by meaning with part of speech and definitions. | spec |
| Text Summarization API | Summarize any text or article URL in 50+ languages: picks the most important sentences (TextRank), with keywords and reading-time saved. | spec |
| Text Utilities (word count, readability, slug, hash, Base64) | Handy text tools in one API: word/sentence count, reading time, Flesch readability and top words; URL slugs; SHA-1/256/384/512 hashes; Base64 encode/decode. | spec |
| Time Zone Converter & World Clock | Current time or any date in any IANA time zone, UTC offset, weekday and Unix time, and convert one moment to many time zones at once. | spec |
| Timezone by Coordinates API (lat/lon to IANA zone) | Get the IANA time zone for any latitude/longitude, with the current local time, UTC offset, abbreviation and whether daylight saving time is active. | spec |
| Unit Converter & Math Calculator | Convert between 300+ units (length, weight, volume, temperature, speed, data, energy, time...) and evaluate math expressions safely (functions, constants, units, matrices). | spec |
| URL Status & Redirect Chain Checker | HTTP status, full redirect chain (301/302/307/308), final URL, server and response time for any link. | spec |
| URL Unshortener / Link Expander | Expand short links (bit.ly, t.co, tinyurl and any redirect) to their final destination, with every hop of the redirect chain. | spec |
| User Agent Parser (browser, OS, device, bot) | Parse any User-Agent string into browser and version, operating system and version, device type (mobile/tablet/desktop), rendering engine and bot detection. | spec |
| VIN Decoder API - Make Model Year Engine | Decode any 17-character VIN: make, model, model year, trim, body, engine, fuel, transmission, drive type and plant, plus check digit validation, region and country of manufacture. | spec |
| Website Technology Lookup (CMS, frameworks, analytics) | Detect 130+ technologies a website uses: CMS (WordPress, Shopify, Wix, Webflow), frameworks (React, Next.js, Vue), analytics and pixels, chat, CDN and hosting. | spec |
| XML, YAML & JSON Converter | Convert XML to JSON (attributes kept with @), JSON to XML, YAML to JSON and JSON to YAML. | spec |
| Zodiac Sign API - Western and Chinese Astrology | Exact zodiac sign from a birth date, time and time zone (computed from the Sun's real position, so cusp birthdays are right) plus the Chinese zodiac from the real lunisolar calendar: animal, element, yin/yang and the year's start and end dates. | spec |
Examples are MIT licensed — copy them into your project.