Toolk Blog
Practical, no-fluff posts from the team building Toolk — written for developers, designers, and creators who want to ship faster.
A Unix timestamp counts seconds since 1970-01-01T00:00:00 UTC, ignoring leap seconds. Learn seconds vs milliseconds, the Year 2038 problem, and conversion.
px is an absolute pixel, em is relative to the element's own font-size, rem is relative to the root. Default to rem for accessibility — here is why and when.
The SEO title and meta description shape your SERP result; Open Graph and Twitter Card tags control how your link looks on Facebook, LinkedIn, X, and Slack.
Markdown turns plain text into formatted docs. Learn the portable CommonMark core, GFM extras like tables and task lists, and the blank-line rule everyone forgets.
A JWT is three Base64URL parts joined by dots — header.payload.signature. The first two are readable by anyone; the signature makes it tamper-evident.
JSON for APIs and data interchange, YAML for human-edited config, XML for documents and enterprise. The exact tradeoffs, footguns, and conversion gotchas.
A strong password is long and random, not full of symbols. Learn why a 5-word passphrase beats P@ssw0rd!, how to count entropy, and what NIST 800-63B now says.
Calculate any mortgage payment by hand with the amortization formula M = P·[r(1+r)^n]/[(1+r)^n−1]. Full worked example, PITI breakdown, and rate tables inside.
HEX and RGB are the same sRGB color in different notation, HSL is a human-friendly transform, and OKLCH is perceptually uniform. Here is when to use each.
Encoding is reversible without a key, encryption is reversible with a key, hashing is one-way. The exact differences and when to use each.
Convert CSV to JSON without corrupting data: how to handle quoting, delimiters, type inference, and nesting, plus a worked round-trip showing what survives.
The 7 JSON errors that break parsers every day — trailing commas, single quotes, unquoted keys, comments, bad brackets, wrong types — with the exact fix.
The 50+ developer tools worth using in 2025 — AI-native IDEs like Cursor, edge databases, and performance utilities — with what each one is best at.
How to validate and format JSON correctly: spec rules from RFC 8259, common parser errors, and formatting defaults that keep diffs clean.
Text processing tools that speed up content work — word counters, case converters, find-and-replace, and readability checks, all free in your browser.
How Base64 encoding works, when to use it, and what it costs: a 33% size overhead, no security, and the URL-safe variant most APIs expect.