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Blogs
How to Validate an IBAN in JavaScript & Python (Beyond the Mod-97 Checksum)
If you're building a payment form, payroll integration, or any onboarding flow that touches European bank accounts, you'll need IBAN validation. The core algorithm is straightforward to implement in either language with no dependencies. What it won't tell you is whether the account actually exists, w...
By M Khizar Aslam - 06 July, 2026
The Best Screenshot APIs for Developers in 2026
Picking the best screenshot API for your stack is harder than it looks. The feature sets vary considerably between providers, pricing models are often structured around tiers, and the difference between what is advertised and what is available on a base plan can be significant. This post compares fo...
By M Khizar Aslam - 24 June, 2026
How to Investigate a Suspicious IP Address: A Step-by-Step Threat Hunting Playbook
You are looking at an alert, and at the center of it is a suspicious IP address that means nothing to you yet. Maybe your SIEM flagged repeated failed logins from it. Maybe it turned up in a WAF log, hammering an endpoint a few hundred times a minute. Maybe a user forwarded a phishing email and that ...
By M Khizar Aslam - 18 June, 2026
Best IP Geolocation API in 2026: We Tested 5 APIs on the Same IPs
Most IP geolocation APIs make you choose: you can have location data cheaply, or you can have security context if you pay more, or you can have abuse contacts if you're on enterprise. APIFreaks is the only API in this test that returns all three (geolocation, security flags, and abuse contacts) in a ...
By M Khizar Aslam - 10 June, 2026
How to Handle Unix Timestamps and Timezones in REST APIs
Time handling is one of the smallest decisions in API design and one of the most expensive to get wrong. A misconfigured timezone in a database config, an ambiguous timestamp in a response body, a UTC offset stored instead of an IANA zone name. None of these throw exceptions. They produce silent data...
By M Khizar Aslam - 04 June, 2026
API Error Handling: How to Build Integrations That Don't Break
When an API call fails, two things usually happen. The developer logs the error, adds a generic retry, and ships. Three weeks later, something breaks in production in a way the logs barely explain — a credit balance silently hit zero, a concurrency limit was being exceeded without anyone noticing, or...
By Muhammad Sikandar Subhani - 19 May, 2026
How to Test SMTP with Telnet (Windows, Linux & Mac)
Every time you click Send in Gmail or Outlook, SMTP is doing the work behind the scenes routing your message from one server to another using a handful of plain-text commands. When that process breaks, figuring out where it went wrong can feel like guesswork. Telnet removes all that uncertainty by le...
By Afraz Ahmed - 17 May, 2026
API Gateway in Microservices: Architecture, Patterns and Examples
Modern software rarely lives in one place anymore. What used to be a single application handling everything from user login to payment processing has been broken apart into smaller, focused services that each do one thing well. This approach is called microservices architecture, and while it solves m...
By M Khizar Aslam - 08 May, 2026
The Best RapidAPI Alternative for Developers — Meet APIFreaks
If you're looking for a RapidAPI alternative, you already know why. Maybe the billing didn't add up. Maybe support pointed fingers instead of fixing things. Maybe an API that worked fine last week quietly stopped working. Whatever it was, the frustration is legitimate. Maybe it was the overage charg...
By M Khizar Aslam - 07 May, 2026
The Best Regular Expression Email for Accurate Address Validation
Email validation is a basic and mandatory requirement in modern web development. And regular expression email patterns provide efficient way to verify email address formats. In building signup forms, contact pages or user authentication systems, implementing email regex validation is essential. It is...
By M Khizar Aslam - 15 December, 2025
Check and Validate Email Addresses with our fast and reliable Email Verification API
Our email checker API lets you validate email addresses, MX records, domain names, disposable and temporary email addresses, catch-all email addresses, role based emails and other email analysis parameters. Use our real time email verification API to clean your email lists. Prevent malicious users s...
By M Khizar Aslam - 15 December, 2025
The Best Email Checker Bulk: Fast and Reliable Verification Solutions
In today's digital marketing landscape, email remains one of the most powerful tools. Through email, targeted audience can be reached in a very convincing and effective way. However, if email addresses are invalid then valuable resources can be wasted. At the same time, sender's reputation will be da...
By M Khizar Aslam - 15 December, 2025