Dev Toolkit
How to use
What it does
A handful of small tools for everyday development: format and validate JSON, count lines of code while separating blanks from comments, extract every TODO and FIXME comment from a project, generate a JSDoc comment template from a function signature, estimate the time and space complexity of a snippet, and render code as an image card that is easy to share. Five more merged tabs load on demand: key-code readout, Unicode code-point browsing, URL query-string parser, favicon generator and OG-image generator.
How to use it
Tabs across the top switch between the features. Paste into the JSON panel to format it or see where the error is; the line counter accepts pasted or uploaded files; TODO extraction lists results by file and line number; the JSDoc panel builds a comment block from the parameters and return value you enter; the complexity panel shows its reasoning; and the code card exports an image after you adjust theme and background.
FAQ
How far can I trust the complexity estimate?
It is an estimate of time and space complexity, not a measurement, and it shows the reasoning behind its verdict — good for checking intuition quickly, while exact performance still needs real-world profiling.
How are the extracted TODOs organised?
Every TODO and FIXME is listed by file and line number, easy to walk through one by one or turn into a task list.
Can code cards be exported?
Yes — adjust the theme and background, then export an image card for sharing the snippet in articles or on social platforms.
Related articles
More tools
Lot drawing, I Ching coin casting, daily tarot draw, Guandi lots, coin-flip decisions, dream dictionary and a fun fortune teller.
Flashcards, kana chart, stroke counts, idiom chain, poem fill-in and brain teasers.
Love match, horoscope, coin decision, habit/water/ledger/todo trackers, vCard/iCal, username/avatar/placeholder generators and more.
Charset/encoding viewer, HTML entity, JS sandbox, CSS unit converter, selector tester, markdown table, TOC, JSON query and viewport inspector.
Karnaugh map simplifier, physics constants, resistor color codes, binary logic, base conversion, plus truth tables and a logic-gate sandbox.
Quick reference for XSS/SQLi payloads, HTTP status, OWASP, CORS, DNS, ports and more.