21 tools WEB
Utilities for the web stack: formatters for HTML, CSS, SQL, and XML, a JS minifier for production bundles, SVG optimization, OpenAPI validation, accessibility audits, and clean PWA checks. Your code, your markup, and your secrets stay local to your browser and never reach a server.
Master workflows, understand protocol specifications, and avoid production edge-cases.
Transform OpenAPI (Swagger) specifications into executable Postman Collections (v2.1). Automate contract testing, generate mock servers, and streamline API integration.
Strip DOM boilerplate, convert complex HTML tables and semantic trees into clean Markdown, slash RAG embedding token costs by 60–80%, and preserve critical context for LLMs.
Master Content Security Policy (CSP) headers, nonce generation, sha256 script hashing, Report-Only mode, and debugging modern Next.js and SPA violations.
Transform raw cURL commands and browser network exports into production-ready JavaScript Fetch, Axios, Python Requests/HTTPX, and Go net/http code.
Resolve minified JavaScript bundle errors back to original TypeScript source code using VLQ-decoded source maps, hidden source maps, and stack trace resolvers.
A production debugging guide to fixing missing origin headers, failed preflight OPTIONS requests, credentialed CORS mismatches, and reverse-proxy proxy pass drops.
Master Open Graph protocol, Twitter Card meta tags, dynamic OG image generation, and crawler cache invalidation across Slack, Discord, Twitter/X, and LinkedIn.
Learn how to detect frontend frameworks, CMS platforms, CDN edge layers, and server runtimes using DOM markers, script paths, and HTTP response headers.
A comprehensive developer guide to writing production-grade Dockerfiles: mastering BuildKit cache invalidation, multi-stage builds, non-root execution, and security linting.
Diagnose JavaScript bundle bloat, fix broken tree-shaking patterns, eliminate barrel file overhead, and optimize Core Web Vitals (INP/LCP) in Next.js, Vite, and Webpack.
How to generate type-safe TypeScript interfaces, Zod runtime validation schemas, and JSON Schema definitions from arbitrary JSON payloads.
A comprehensive developer guide to identifying and fixing GitHub Actions YAML syntax errors, matrix build bugs, expression interpolation traps, and concurrency race conditions.
Generate end-to-end type safety across your GraphQL stack. Learn how to convert GraphQL SDL schemas and documents into typed queries, mutations, and resolver signatures.
Diagnose and handle HTTP 429 status codes. Master IETF standard RateLimit and Retry-After headers, and implement production-grade exponential backoff with full jitter in Node.js, Python, and Go.
A practical guide to analyzing HTTP Archive (HAR) files, decoding network timing waterfalls, identifying high TTFB, and debugging slow REST and GraphQL APIs.
A comprehensive engineering guide to CSS @keyframes animations, GPU compositor layer promotion, cubic-bezier easing mathematics, and WCAG accessibility patterns.
Master HTML entity encoding, numeric character references, context-aware XSS escaping in body vs attributes vs JS, and HTML5 named entity parser rules.
Master HTTP caching headers, understand browser vs CDN shared cache directives (s-maxage, stale-while-revalidate, immutable), and eliminate stale content and cache poisoning bugs.
Master HTTP 3xx status codes: 301 vs 308 permanent redirects, 302 vs 307 temporary redirects, fixing ERR_TOO_MANY_REDIRECTS loops, and optimizing redirect chains.
Diagnose and fix syntax errors, missing resource limits, selector mismatches, and schema validation failures in Kubernetes manifests before deployment.
Master 5-field and 6-field cron syntax, prevent double executions during Daylight Saving Time (DST), handle UTC schedules, and debug missed server jobs.
A comprehensive developer guide to CSS selectors, specificity calculation mechanics, the :has() relational selector, forgiving selector lists, and high-performance DOM querying.
Resolve Git merge and rebase conflicts with confidence. Master standard vs diff3 conflict markers, 3-way merge logic, and conflict prevention strategies.
Learn how to convert JSON payloads into robust, idiomatic C# classes and records. Master System.Text.Json, JsonPropertyName, Newtonsoft.Json, nullable reference types, and custom converters.
Learn how to convert JSON payloads into robust, idiomatic Go structs. Master struct tags, omitempty edge cases, pointer nullability, and custom unmarshaling.
A comprehensive developer guide to positional numeral systems, arbitrary-precision BigInt radix conversions, two's complement signed arithmetic, and IEEE 754 float inspection.
A comprehensive developer guide to responsive web design, covering layout vs visual viewports, modern CSS media queries, container queries, fluid typography, and viewport testing strategies.
Diagnose slow database queries by decoding EXPLAIN (ANALYZE, BUFFERS) output trees, optimizing composite indexes, understanding bitmap heap scans, and eliminating sequential scans.
A technical guide to authoring, validating, and debugging JSON Schema tool definitions for Model Context Protocol (MCP) servers in AI agents and LLM applications.
A comprehensive developer guide to modern web color spaces: understanding OKLCH perceptual uniformity, Display P3 wide gamut, sRGB conversions, and accessible UI palettes.
Generate end-to-end type safety from OpenAPI and Swagger specs. Learn how to convert OAS 3.0/3.1 JSON/YAML schemas into typed fetch clients, Zod validators, and path types.
Build installable Progressive Web Apps that pass Lighthouse audits. Master web app manifest configurations, maskable icons, and service worker caching strategies.
Master unidirectional SSE vs bidirectional WebSockets for modern applications. Learn HTTP/2 multiplexing, automatic reconnection, Nginx proxy buffering gotchas, and token-by-token LLM streaming.
Strip metadata bloat and invisible paths using SVGO, sanitize malicious script tags and inline event handlers to prevent SVG-based XSS, and configure responsive viewBox scaling.
Demystify percent-encoding rules, avoid double-encoding pitfalls, master + vs %20 space representations, and serialize complex nested objects and arrays for REST query strings.
Master code diff algorithms (Myers, Patience, Histogram), unified diff patch anatomy (@@ coordinates), side-by-side vs inline comparison, and patch workflows.
Master JSON Schema visualization and debugging: resolve complex $defs pointers, catch recursive circular loops, inspect validation constraints, and render OpenAPI diagrams.
A comprehensive developer guide to WCAG 2.2 accessibility compliance: new success criteria, color contrast ratios, keyboard navigation, ARIA patterns, and CI/CD audit workflows.
Master webhook security: implement HMAC-SHA256 signature verification, prevent replay attacks with timestamp headers, avoid raw-body parser bugs, and secure asynchronous API callbacks.
Optimize Core Web Vitals (LCP), compare AVIF vs WebP compression and decoding speeds, strip EXIF metadata, and implement responsive picture elements.
Master XML formatting standards, well-formedness rules vs XSD validation, namespace resolution, CDATA handling, and server-side XXE attack prevention.
Yes, all web & code tools are free with no limits. SQL formatting, URL encoding, JS minification, and validation all run directly in your browser.
Yes. The OpenAPI validator checks your spec for structural issues that violate the spec, and the PWA audit validates manifests and service workers.
No. Every web & code tool works instantly from a paste, with no account and no data uploads.