Every tool a dev needs,
right in your browser
Format JSON. Decode JWTs. Convert timestamps. Generate UUIDs. Test regex. 750+ utilities that run entirely in your browser.
12 categories, one keystroke away
Every tool organized by purpose so you stop scrolling and start working.
Parse, format, validate and convert JSON — the lingua franca of APIs.
Manipulate, transform, count and clean any text.
Preview, convert and format Markdown for docs and READMEs.
Base64, URL, HTML, JWT, hash — encode and decode everything.
CSV, XML, TOML — move between data formats losslessly.
Pretty-print and minify HTML, CSS, JS, SQL, XML.
HTTP status codes, MIME types, headers, User-Agent parser.
Convert colors, build palettes, check contrast.
Timestamps, timezones, cron, durations.
Convert, resize, compress, edit and inspect — every image task, locally.
Test, build, explain, convert and benchmark regular expressions.
Random, IDs, mock data, calculators, references and browser debug — the kitchen sink.
The tools developers reach for
Curated from across all categories — the utilities that get opened over and over.
Pretty-print, validate and minify JSON with syntax highlighting.
Convert arrays of objects into clean, downloadable CSV.
Generate TypeScript interfaces from any JSON sample.
Generate Zod validation schemas from any JSON sample.
Generate Pydantic v2 models from any JSON sample.
Fix broken, malformed or LLM-generated JSON automatically.
Convert between camelCase, snake_case, PascalCase, kebab-case.
Compare two texts side-by-side with character-level diff.
Live GitHub-Flavored Markdown editor with instant preview.
780+ developer tools
Pretty-print, validate and minify JSON with syntax highlighting.
Validate JSON against RFC 8259 with precise error locations.
Strip whitespace for the smallest possible JSON payload.
Convert arrays of objects into clean, downloadable CSV.
Parse CSV into structured JSON arrays instantly.
Convert JSON objects to well-formed XML.
Bidirectional JSON ↔ YAML conversion.
Convert YAML configuration files to JSON.
Generate TypeScript interfaces from any JSON sample.
Generate Zod validation schemas from any JSON sample.
Generate Pydantic v2 models from any JSON sample.
Generate idiomatic Go structs with JSON tags from any sample.
Your data never leaves the tab.
Open your browser's network tab while using any tool — you'll see zero outbound requests. Every parser, formatter and encoder runs as JavaScript right here in your tab. Paste API tokens, internal payloads, or production data without thinking twice.
- Zero telemetry, zero analytics, zero pixels
- Works fully offline after first load
- Every input gets a shareable URL
- Source is inspectable in DevTools — audit before you trust
Engineered for the way you actually work.
Most online utilities treat developers like end-users. We don't. Every tool is built around four things that matter when you're elbow-deep in a payload at 2 a.m.: speed, privacy, repeatability, and zero friction.
Tools run entirely in your browser — no server round-trips, no rate limits, no queues. Most operations finish before you finish typing the last character.
Inputs are processed client-side and never transmitted. Paste API keys, tokens, internal payloads — they stay on your machine.
not cursors.
Press ⌘K on any page to fuzzy-search every tool. Arrows to navigate, Enter to open.
in the URL.
Send a link — your teammate sees the same input, output and settings. No accounts, no syncing, no diff.
into another.
Output of one tool feeds the next with one keystroke. Build multi-stage flows without leaving the page.
No bundled binaries, no obfuscation, no minified vendor blobs. Open DevTools, hit “view source,” read the JavaScript. We don't hide what we run — and neither should anyone you're pasting secrets into.