The dev tools you settle for, done right.

The jq playground developers actually keep open.

jq is the best way to slice JSON at the command line, but iterating on a filter inside a terminal is slow and disposable. Jqbin runs the real jq engine in your browser via WebAssembly, keeps a local history of every query you've written, and gives you a permalink you can drop into a coworker's DM. Twenty-plus curated recipes ship with it. Extraction, grouping, array work, the patterns you'll actually reach for.

Format SQL in seconds. No login. No install.

Every online SQL formatter fails somewhere. Some strip comments without asking. Others mangle dialect-specific syntax. Most force one opinionated style and won't let you bend it. tidysql handles fourteen dialects. Postgres, MySQL, SQL Server, BigQuery, Snowflake, and the rest. Real control over keyword case and indentation, and a side-by-side diff that shows exactly what changed. That matters when you're cleaning a migration that has to go through review before it ships.

The fastest, cleanest JSON formatter online.

Paste JSON, get it formatted before your finger leaves the V key. Syntax highlighting separates keys, strings, numbers, booleans, and null. Errors come back with exact line and column numbers. Minify mode compresses for transport, dark mode respects your system, and everything runs client-side. That matters when the payload you're inspecting is a webhook, a prod config, or an LLM response with user data you'd rather not hand to a third party.

Paste. Compare. Copy the diff.

Diff tools built for flat text treat JSON and YAML like two walls of characters. Paste two blobs into diffpad and you get a structural diff that actually understands keys, arrays, and nested objects, with color-coded additions, deletions, and changes. The plain-text summary copies with one click. That's what you need when you're explaining a config change inside a pull request comment or a Slack thread.

See exactly which cron field is wrong, and why.

Cron expressions fail quietly. A typo in the month field or a bad day-of-week spec won't throw an error. The job just doesn't run, and you find out when something you expected to happen didn't. lintcron validates each field on its own, tells you exactly which one is broken and why, translates the expression into a schedule you can read, and previews the next few runs so you can sanity-check the cadence before you commit it.

Paste a messy table. Get a perfect one. Instantly.

Markdown tables look simple until you paste one with ragged columns or wide Unicode characters. pipefmt aligns pipe-delimited tables correctly and accounts for CJK characters that take up two visual columns. That's an edge case most formatters quietly get wrong. Live preview updates as you type, the output copies in one click, and the result pastes cleanly into GitHub issues, readmes, and anywhere else a table has to land legibly.

CSV to JSON in one paste.

CSV-to-JSON is the conversion you run when seeding a database, scaffolding a prototype, or converting a spreadsheet a PM just handed over. Rowson auto-detects the delimiter (comma, tab, pipe, or semicolon), handles quoted fields and embedded newlines, and gives you four output shapes: arrays of objects, objects keyed by column, flat arrays, or pivoted. Pretty or compact. Copy or download. Nothing uploaded.

Hex math that shows its work in every base.

Bitwise ops are still how flags, permissions, and low-level protocols work, and the math is miserable to do by hand. Oktal evaluates hex expressions with arithmetic and bitwise operators (AND, OR, XOR, NOT, left and right shifts), then shows the result in hex, decimal, octal, and binary at the same time. Good for debugging packed fields, decoding file permission masks, reading protocol specs, or just sanity-checking your mental math before a PR goes in.

Build an RBAC matrix. Export it anywhere.

RBAC matrices usually live in a spreadsheet because nobody builds a dedicated tool for them, and from there they get hand-transcribed into Markdown for a README or wiki. It's a workflow nobody enjoys. Rolemat gives you a real checkbox grid (up to fifty roles by a hundred permissions) and exports to CSV, Markdown, or JSON in a single click. The Markdown is paste-ready for GitHub, which is where RBAC docs usually end up anyway.

The Unix timestamp converter that tells you what you're looking at.

Unix timestamps come in four flavors: seconds, milliseconds, microseconds, nanoseconds. And log files almost never label which one they're using. Epochr guesses the unit from magnitude, converts to ISO 8601, local time, UTC, and relative formats, and copies anything in one click. The tool you leave open in a background tab when you're correlating events across systems that disagree, quietly, about precision.

Token count, cost, and context window for GPT, Claude, and Gemini.

LLMs charge per token. Context windows are measured in tokens. And yet most developers are working blind about how many tokens their prompts actually burn. Toklen counts tokens for GPT, Claude, and Gemini, estimates cost per request, and shows context window usage as a live progress bar. Everything runs in your browser, which matters when the prompt you're measuring is internal IP you wouldn't want to paste into a third-party endpoint.