10 famous mountains with height, first ascent, difficulty, and fascinating records.

20 major airports with IATA/ICAO codes, hub airlines, and passenger counts.

Verify webhook signatures for Stripe, GitHub, Slack, Shopify, and generic HMAC.

Guide to PWA features: service workers, web app manifest, and offline support.

Parse cron expressions into human-readable descriptions with next run times.

Decode and validate JWT tokens — header, payload, and expiry.

12 major music genres with BPM ranges, instruments, characteristics, and subgenres.

Real-time and historical earthquake data from USGS including magnitude, location, depth.

Real-time AQI pollutant levels and health recommendations

Get capital, currency, population, and languages for 20+ countries.

Judaism Guide data API — search, random, bulk endpoints.

Calculate rail infrastructure maintenance cycle requirements

Guide to Google Core Web Vitals: LCP, FID, CLS, and the new INP metric.

Guide to webhooks: HMAC signature verification, retry logic, and idempotency.

Extract data from Excel spreadsheets as structured JSON

Guide to database optimization: indexing, query caching, and read replicas.

Search Reddit posts and subreddits, find users, and combine multi-reddits.

15 car brands with founding year, founder, revenue, fun facts, and subsidiaries.

Deliver webhook payloads with retry logic and delivery tracking

Reference for vector database options: Pinecone, Weaviate, pgvector, Chroma.