Blog
Tutorials, product updates, and developer guides from all 10 toolkits.
How Accurate Is IP Geolocation? A Developer's Guide
IP geolocation is useful but imperfect — understand its limits before building on it.
Read more →SMTP Verification: The Gold Standard for Email Deliverability
Learn how SMTP mailbox probing works and why it's more reliable than MX-only checks.
Read more →Merging and Splitting PDFs Programmatically with an API
Learn how to merge multiple PDFs into one or split a PDF into individual pages using a REST API.
Read more →Bcrypt vs Argon2: Choosing a Password Hashing Algorithm
Compare the two leading password hashing algorithms and understand when to use each one.
Read more →The Complete On-Page SEO Audit Checklist for Developers
Automate your SEO audits by checking titles, meta descriptions, headings, images, and more.
Read more →Converting JSON to CSV via API for Data Exports
Flatten nested JSON arrays into clean CSV files with a single API call.
Read more →MX Record Lookup: Troubleshooting Email Delivery
MX records determine where email for your domain gets delivered.
Read more →Detecting VPNs, Proxies, and Tor Exit Nodes via API
Protect your app from fraud by identifying anonymising traffic sources.
Read more →Detecting Disposable Email Addresses at Scale
Block throwaway signups by identifying 500+ disposable email providers programmatically.
Read more →Generating PDF Invoices from HTML Templates
Convert HTML and CSS into clean PDF documents — perfect for invoices, reports, and receipts.
Read more →JWT Best Practices: Signing, Expiry, and Key Rotation
Avoid common JWT pitfalls with proper signing algorithms, expiry handling, and key management.
Read more →Validating Structured Data (JSON-LD) for Rich Results
Ensure your schema.org markup is correct to unlock rich snippets in search results.
Read more →YAML vs TOML: Converting Between Configuration Formats
Understand the differences between YAML and TOML and convert between them programmatically.
Read more →How to Detect Open DNS Resolvers
Open DNS resolvers are a security risk and a tool for DDoS amplification attacks.
Read more →Haversine vs Vincenty: Choosing the Right Distance Formula
Both formulas calculate great-circle distance — here's when to pick each one.
Read more →Catch-All Domains: What They Are and Why They Matter
Catch-all domains accept every address — here's how to detect them and what it means for validation.
Read more →Extracting Tabular Data from PDFs with Layout-Aware Parsing
Pull structured table data from PDF documents using intelligent layout analysis.
Read more →Implementing TOTP Two-Factor Authentication
Add time-based one-time passwords to your app with QR codes and RFC 6238 compliance.
Read more →How Broken Links Hurt Your SEO and How to Find Them
Broken links damage user experience and crawl efficiency — detect them programmatically.
Read more →XML to JSON Conversion: Common Pitfalls and Solutions
Attributes, namespaces, and repeated elements — handle XML-to-JSON edge cases correctly.
Read more →IP Geolocation for Developer Applications
Learn how IP geolocation works, its accuracy limitations, and how to integrate it into your apps.
Read more →Converting JSON to YAML for Kubernetes Configurations
Learn how to convert JSON configs to YAML programmatically using the API.
Read more →Extracting Article Content from Any URL with an API
Turn any article URL into clean, readable text with a single API call.
Read more →How to Resize Images via API Without Losing Quality
A practical guide to resizing images programmatically with aspect ratio preservation.
Read more →Timezone Conversion for Global Applications
Handle daylight-saving transitions and UTC offsets correctly with an API.
Read more →Email Header Forensics: Tracing Spoofing and Routing
Parse raw email headers to trace routing hops, authentication results, and spoofing indicators.
Read more →Password-Protecting and Decrypting PDFs via API
Add AES-256 encryption to PDFs or remove password protection programmatically.
Read more →AES-GCM Encryption for Developers: A Practical Guide
Understand authenticated encryption with AES-256-GCM and how to use it correctly.
Read more →robots.txt and Sitemap.xml: Best Practices for Crawl Control
Configure robots.txt and sitemaps correctly to guide search engine crawlers.
Read more →Rendering Markdown to HTML with Syntax Highlighting
Convert Markdown to HTML with GFM tables, fenced code blocks, and Pygments highlighting.
Read more →What Are DNSSEC Records and How to Verify Them
Understand DNSSEC — the DNS security extension that protects against spoofing and cache poisoning.
Read more →Secure Password Hashing with Bcrypt: A Developer's Guide
Everything you need to know about bcrypt for password security.
Read more →LLM-Ready Markdown Extraction for AI Agents
Feed AI agents clean Markdown without wasting tokens on HTML.
Read more →Converting Images to WebP for Faster Page Loads
WebP is 25-35% smaller than JPEG at the same quality. Here's how to convert in bulk.
Read more →Building Geofences with Bounding Box Calculations
Use bounding-box math to create lightweight geofences without a full GIS stack.
Read more →Gmail Address Normalization for User Deduplication
Gmail ignores dots and plus-aliases — learn how to normalize addresses to prevent duplicate signups.
Read more →Converting PDF Pages to High-Resolution Images
Render PDF pages as PNG or JPEG images at configurable DPI for thumbnails, previews, and archiving.
Read more →Generating Secure API Keys: Formats and Best Practices
UUID, nanoid, or cryptographic random — pick the right API key format for your use case.
Read more →Keyword Density Analysis: Avoiding Over-Optimization
Use keyword density metrics to balance SEO optimization without triggering spam filters.
Read more →Validating JSON Against Schemas via API
Enforce data contracts by validating JSON payloads against JSON Schema specifications.
Read more →Generating Realistic Mock Data for API Development
Build better tests with realistic mock data generation.
Read more →Building Rich Link Previews with OpenGraph Data
How to unfurl links into rich preview cards in your app.
Read more →Generating QR Codes at Scale with a REST API
From payment links to WiFi sharing — generating QR codes programmatically.
Read more →Debugging JWT Authentication: A Practical Guide
Common JWT pitfalls and how to debug them with an API.
Read more →Web Scraping Without Playwright or Puppeteer
Ditch the headless browser maintenance and use a simple REST API instead.
Read more →Extracting Dominant Colours for Dynamic UI Theming
How to build image-aware UI themes by extracting colour palettes from images.
Read more →Building API-First Developer Tools: Lessons from Dev Toolkit
Design principles for building API-first developer utilities.
Read more →Why You Should Strip EXIF Data Before Publishing Images
EXIF metadata can expose GPS locations, device info, and timestamps. Here's how to remove it.
Read more →Using Text Diffing for API Regression Testing
Catch breaking API changes automatically with text diffing.
Read more →Automating SSL Certificate Monitoring with APIs
Never let certificates expire again.
Read more →UUID, Nanoid, ULID: Choosing the Right ID Format
Compare unique ID formats and pick the right one for your use case.
Read more →Jinja2 Templates for DevOps Automation
Use Jinja2 templating via API for dynamic config generation.
Read more →DNS Lookups for Email Deliverability Troubleshooting
Diagnose email delivery issues by checking DNS records.
Read more →