Blog
Practical notes and guides for using yukt.tools with clearer decisions and fewer detours.
How Many Weeks Between Two Dates? Full Weeks, Remainder Days, and Calendar Weeks
Learn how to turn the days between two dates into full weeks and remainder days, and when calendar-week labels answer a different question.
readHow to Read DNS MX Records When Email Is Not Arriving
Learn what MX priorities and mail hostnames mean, how to check the exact domain, and which DNS results to verify before changing email delivery settings.
readWhat Is a DNS A Record? IPv4 Addresses, Hostnames, and Common Mistakes
Learn what a DNS A record does, how it differs from CNAME and AAAA records, and how to check the right hostname before changing a website's DNS.
readHow to Read DNS TXT Records for Domain Verification, Email, and Site Ownership
Learn how to inspect DNS TXT records, distinguish domain-verification tokens from SPF and DMARC policies, and check the exact name and value before troubleshooting.
readHow to Calculate Business Days Between Dates Without Missing a Deadline
Learn how to count business days between dates, define whether endpoints count, handle weekends and holidays, and write a deadline rule others can follow.
read1200 × 1500 Aspect Ratio: Is It 4:5, and How Do You Resize It?
Find the simplified 1200 × 1500 aspect ratio, calculate matching dimensions, and choose between resizing, cropping, and adding padding without distortion.
readHow to Calculate Date Duration: Inclusive vs. Exclusive Dates
Learn how to calculate the duration between two dates, choose inclusive or exclusive counting, and avoid off-by-one errors in plans, deadlines, and reports.
readJWT Validation: What to Check After You Verify the Signature
Use a practical JWT validation checklist: restrict algorithms, verify the signature, and enforce issuer, audience, and time claims before trusting a token.
readApps for Kids: A Parent Checklist for Choosing Story Time
A practical checklist for evaluating kids' apps, with a thoughtful look at ReadyTales as an option families can explore for story time.
readHow to Build URL Query Parameters Without Breaking Values
Learn how to encode URL query parameter names and values correctly, avoid double encoding, and preserve repeated keys, empty values, and literal plus signs.
readHow to Convert CSV to JSON Without Losing Commas, Quotes, or Types
Learn how to convert CSV to JSON reliably: handle quoted commas and escaped quotes, preserve headers, and decide which values should become numbers, booleans, or text.
readUnix Timestamps: Seconds, Milliseconds, and Time Zones Explained
Learn how to identify a Unix timestamp's unit, convert it without shifting the instant, and use an RFC 3339 date-time to show the intended time zone.
readHow to Verify a Download With SHA-256: A Safe, Repeatable Check
Learn how to compare a downloaded file's SHA-256 hash with a publisher's value, what a match establishes, and when you still need to verify the source.
readHow to Read a JSON Parse Error: A Practical Debugging Checklist
Learn how to trace a JSON parse error to the actual character and structure problem, then validate a safe fix without changing the intended data.
readBase64 vs. Base64url: Why Encoded Text Breaks in URLs and JWTs
Learn the practical difference between Base64 and Base64url, when padding matters, and how to handle encoded data safely in URLs and JWT-style compact strings.
readUUIDv4 Collision Risk: When Random IDs Are a Good Database Choice
Understand UUIDv4 collision risk, why uniqueness is probabilistic, and how to use random UUIDs safely with database constraints and retries.
readHow to Read a DNS SOA Record When Troubleshooting a Zone
Learn what the fields in a DNS SOA record mean, how to compare zone serials, and when an SOA result points to delegation or negative-caching issues.
readAI Agent Identity, Email, and Payment Access: A Practical Setup Guide
A practical guide to giving an AI agent a distinct identity, a controlled email address, and limited payment access without treating it as an unsupervised employee.
readAdd vCard Contacts on Android: Review or Provider Write
Enable the developer to keep vCard parsing separate from Android contact creation, choose the correct review or provider path.
readBefore You Convert Cron to RRULE: A Schedule Migration Checklist
Enable a controlled migration that identifies schedules requiring manual modeling, preserves calendar context, and verifies target behavior before cutover.
readSEO Health Needs Attention: A Practical Site Check
A focused SEO health guide for utility sites: check metadata, crawlability, internal links, trust cues, and high-intent tool paths.
readCanadian Income Tax Estimation: A Practical Guide
Estimate Canadian income tax with clear inputs, CRA-source caveats, and practical checks before using a number for planning.
readDeveloper Utility Workflows: A Practical Guide
Build cleaner developer utility workflows for DNS checks, JSON validation, timestamps, UUIDs, encoding, and contact data cleanup.
readDNS Dig Troubleshooting: A Practical Guide
Use dig to debug DNS records, propagation, TTLs, DNSSEC, and resolver differences with clear examples and practical next steps.
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