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Deep technical articles on APIs, security, debugging, and developer tooling.
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Why 0 0 1 * 1 Runs 63 Times a Year: The Cron OR Trap
Timestamp Converter — Unix Time to Date & Date to Timestamp
Learn what Unix timestamps are, why they're used everywhere in software, how to convert them to human-readable dates, and how to avoid the seconds vs. milliseconds confusion.
URL Encoder/Decoder — Percent-Encode & Decode URLs Instantly
Learn why URL encoding exists, how percent-encoding works, the difference between %20 and + for spaces, and how to encode and decode URLs correctly for APIs and query strings.
REST API Checker — Test Any REST API Instantly in Your Browser
Learn how to test REST APIs directly in your browser — send GET, POST, PUT, and DELETE requests, add auth headers, inspect responses, and debug API issues without installing any tools.
Hash Generator — MD5, SHA-1, SHA-256 & SHA-512 Explained
Learn how hash functions work, the differences between MD5, SHA-1, SHA-256, and SHA-3, which algorithm to use for file verification vs. passwords, and how to generate hashes instantly with a free tool.
Cron Explainer — Understand Any Cron Expression in Plain English
Learn how cron expression syntax works, what each field means, common scheduling patterns decoded, and how to use a free cron explainer to verify your schedule before deploying it.
Random String Generator — Secure Tokens, API Keys & Test Data
Learn when and how to generate random strings for session tokens, API keys, OTPs, and test data — what character sets to use, how long they should be, and what entropy actually means in practice.
Password Generator — Create Strong, Random Passwords Instantly
Learn what makes a password truly strong, why human-invented passwords fail, and how to use a free password generator to create cryptographically random credentials for every account.
HTML Entities — Encode & Decode Special Characters Correctly
Learn what HTML entities are, which characters always need encoding, how to use <, &, , and special symbols correctly — with a free HTML entities encoder/decoder tool.
JSON Formatter — Pretty Print, Minify & Validate JSON Instantly
Learn how a JSON formatter works, what common JSON syntax errors look like, the difference between JSON and JavaScript objects, and how to format and validate JSON instantly with a free tool.
