Web & auth
Debug auth, requests, SEO, and browser behavior for real web traffic
Practical browser utilities for JWTs, HTTP requests, headers, cookies, SEO checks, OpenAPI files, and other web troubleshooting tasks.
Open this hub when a site, API, webhook, or sign-in flow is misbehaving and you need visible tooling to inspect tokens, parse headers, test payloads, or audit crawl signals.
Tools in this hub
Featured picks
Language support
Common tasks
Trace auth and session issues
Decode JWTs, inspect OAuth details, and understand cookies or headers during login and API debugging.
Assemble and inspect web requests
Build HTTP payloads, parse URLs, and review request metadata before sending traffic to production services.
Check crawl and sharing signals
Audit metadata, robots rules, and Open Graph output when a page preview or search listing looks wrong.
Featured tools
Start with the registered tools that cover the most common jobs in this workflow, then browse the full list.
JWT & Bearer Token Inspector - Decode JSON Web Tokens
Free online JWT decoder and Bearer token inspector. Decode JWT headers, payloads, and check expiration claims instantly in your browser.
CSS Gradient Generator — Linear, Radial & Conic
Build linear, radial and conic CSS gradients with draggable colour stops, live preview and copyable CSS. No sign-up, runs in your browser.
CSS Box Shadow Generator — Layered & Inset Shadows
Build layered box-shadow and text-shadow CSS with live preview, inset support, elevation presets and copyable output.
CSS Specificity Calculator — Score & Compare Selectors
Score any CSS selector, see which part contributes what, and compare two selectors to find out which rule wins the cascade.
HTTP Request Builder
Import curl commands or visually build HTTP requests, then generate curl, fetch, axios, Python requests, Go net/http, C# HttpClient, and PHP cURL snippets.
SEO Meta Auditor — GEO Content Checker
Audit HTML title, meta description, canonical URL, H1 count, and JSON-LD signals for SEO, GEO, and AI answer-engine readiness directly in your browser.
OpenAPI / Swagger Viewer
Free online OpenAPI 3.x viewer. Paste YAML or JSON to visualize API endpoints, parameters, responses, and schemas. No sign-up required.
All tools in this category
Browse every registered tool in this category and keep moving through the real task at hand.
JWT & Bearer Token Inspector - Decode JSON Web Tokens
Free online JWT decoder and Bearer token inspector. Decode JWT headers, payloads, and check expiration claims instantly in your browser.
CSS Gradient Generator — Linear, Radial & Conic
Build linear, radial and conic CSS gradients with draggable colour stops, live preview and copyable CSS. No sign-up, runs in your browser.
CSS Box Shadow Generator — Layered & Inset Shadows
Build layered box-shadow and text-shadow CSS with live preview, inset support, elevation presets and copyable output.
CSS clip-path Generator — Visual Shape Editor
Draw polygon, circle, ellipse and inset clip-path shapes by dragging handles, then copy the CSS or load an existing value back into the editor.
QR Code Generator & Reader
Free online QR code generator and reader. Create QR codes from text or URLs and decode QR codes from uploaded images instantly.
URL Parser - Parse & Analyze URL Components Online
Free online URL parser tool. Break down any URL into its components — protocol, hostname, port, path, query parameters, and hash fragment.
CSS Specificity Calculator — Score & Compare Selectors
Score any CSS selector, see which part contributes what, and compare two selectors to find out which rule wins the cascade.
SEO Meta Auditor — GEO Content Checker
Audit HTML title, meta description, canonical URL, H1 count, and JSON-LD signals for SEO, GEO, and AI answer-engine readiness directly in your browser.
Webhook Signature Verifier
Verify SHA-256 HMAC webhook signatures for GitHub, Stripe, Slack, and custom API integrations locally in the browser.
HTTP Status Codes Reference - Complete Status Code Guide
Free online HTTP status codes reference. Search and browse all HTTP response status codes with descriptions, categories, and common use cases.
HTTP Request Builder
Import curl commands or visually build HTTP requests, then generate curl, fetch, axios, Python requests, Go net/http, C# HttpClient, and PHP cURL snippets.
CSP Evaluator
Evaluate Content-Security-Policy headers for unsafe directives, missing defaults, wildcard sources, and browser security hardening.
HTTP Cache Policy Builder
Build Cache-Control headers for browser caching, CDN caching, immutable assets, and API response freshness.
JWT JWK JWKS Inspector
Inspect JWK and JWKS public keys, kid values, algorithms, and OAuth/OIDC signing metadata directly in your browser.
OG Meta Tag Preview
Free online Open Graph meta tag preview tool. See how your page looks on Google, Facebook, Twitter, and LinkedIn before publishing.
HAR Analyzer
Analyze HAR files for request counts, response bytes, slow requests, status codes, and web performance debugging.
Basic Auth Generator & Decoder - HTTP Authorization Header
Free online Basic Auth header generator and decoder. Create HTTP Basic Authorization headers from credentials or decode existing headers instantly.
OAuth2 Debugger & PKCE Generator — RFC 7636
Decode JWT tokens, parse OAuth2 authorization URLs, and securely generate or verify RFC 7636 PKCE code verifiers and S256 challenges.
Open Graph and Twitter Card Generator
Generate HTML-escaped Open Graph, Twitter Card, title, and meta description tags for social sharing and SEO previews.
SRI Hash Generator
Generate Subresource Integrity sha256 and sha384 hashes for CDN scripts and stylesheets in the browser.
OpenAPI / Swagger Viewer
Free online OpenAPI 3.x viewer. Paste YAML or JSON to visualize API endpoints, parameters, responses, and schemas. No sign-up required.
Cookie Parser
Free online cookie parser tool. Parse and inspect Set-Cookie headers and document.cookie strings to view names, values, and attributes.
CORS Header Checker
Free online CORS header checker and analyzer. Validate Access-Control headers, diagnose cross-origin issues, and verify preflight configuration.
SAML Response Decoder - Decode & Format SAML XML
Free online SAML response decoder. Decode Base64-encoded SAML responses, format the XML output, and inspect SSO assertions instantly.
CSP Header Builder
Free online Content Security Policy (CSP) header builder and generator. Visually configure CSP directives, validate policies, and test URLs against your security rules.
Safe Links Decoder
Extract the original destination URL from a Microsoft Safe Links style wrapped link without opening the target.
User-Agent Parser
Parse a user-agent string into browser, engine, OS and device, tell Chromium forks apart, and flag crawlers and automation tools.
robots.txt & Sitemap Validator - Validate Robots Rules & Sitemap XML Online
Free online robots.txt and sitemap.xml validator. Parse and validate robots.txt directives, test URL access rules, and verify sitemap XML structure, URLs, and metadata.
HTTP Header Parser - Analyze & Inspect HTTP Headers Online
Free online HTTP header parser tool. Parse raw HTTP headers, inspect key-value pairs, and check security headers like CSP, HSTS, X-Frame-Options, and more.
Device Information - Browser, Screen & Hardware Details
View detailed device and browser information including user agent, screen resolution, GPU, CPU cores, memory, connection type, and more — all detected in real time.
Related categories and collections
Continue with adjacent category pages and task collections that solve the next step.
Crypto & hash
Security-focused tools for hashing, password strength, key pairs, signatures, and token-adjacent inspection without installing another utility.
Development
Everyday helpers for regex testing, diffs, cron expressions, Docker snippets, Markdown cleanup, and other build-and-debug chores.
Data formats
Structured data tools for JSON formatting, YAML and XML conversion, schema validation, CSV editing, and API-ready output.
Security & privacy
Browser-first security helpers for password generation, hashing, encryption, signature checks, metadata removal, and two-factor setup.
International text
A practical cluster for encoding issues, character lookups, locale-sensitive cleanup, phone and email normalization, and text that must survive many systems.