robots.txt vs Meta Noindex: Choosing the Right Control
robots.txt vs meta noindex — the difference and which to use. Why blocking a page can keep it indexed, how X-Robots-Tag works, and a safe deindex workflow.
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Page 2 of 6 — guides, tutorials and tips from our free, privacy-first online tools.
Passphrase vs Random Password: Which Is Harder to Crack?
Passphrase vs random password — which is stronger? Compare entropy, diceware word lists, and cracking cost with hard numbers from NIST SP 800-63B and RFC 2289.
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Strong Wi-Fi and IoT Device Passwords That Still Type Easily
Generate strong Wi-Fi and IoT device passwords that resist offline cracking yet stay easy to type on phones, smart TVs, and tiny device keypads.
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Detecting Config Drift Between Environments with JSON Diff
Use JSON diff to detect config drift between staging and production. Normalize, exclude noise, and catch drift before deploys break with semantic comparison.
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URL-Safe Base64 vs Standard Base64: Key Differences
Standard Base64 uses +, / and = that break URLs, JWTs and filenames. Learn the url safe base64 vs standard base64 difference and how to fix decode errors.
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Catastrophic Backtracking: Spot and Fix ReDoS-Prone Regex
Learn why nested quantifiers cause catastrophic backtracking, how ReDoS attacks freeze servers, and concrete techniques to detect and rewrite vulnerable regex.
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Regex Lookahead and Lookbehind: Practical Examples
Master regex lookahead and lookbehind with clear, testable examples — password rules, thousands separators, masking, and the gotchas that trip people up.
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JWT 'exp' Claim: Fixing Token Expired Errors
Fix JWT token expired errors caused by the exp claim — clock skew, timezone bugs, refresh failures, and leeway — with a fast browser-based decoder workflow.
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JWT Decode vs Verify: Decoding Doesn't Validate a Token
Decoding a JWT only reads its claims; verifying checks the signature. Learn the difference, why it causes auth bugs, and how to test both safely.
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JWT Tokens Explained: How They Work and How to Debug Them
Understand JSON Web Tokens: structure, claims, signing vs encryption, expiry, and signature verification — plus the security mistakes that cause auth bugs.
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JSON Pointer (RFC 6901) Explained
Master JSON Pointer (RFC 6901): how paths address values, why ~0 and ~1 escape ~ and /, the - array token, and how it powers JSON Patch and JSON Schema.
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How to Apply a JSON Patch in JavaScript, Python, and Go
Apply RFC 6902 JSON Patch in JavaScript, Python, and Go with copy-paste examples. Handle test operations, atomic failure, and validate paths safely.
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