Developer & DevOps

Bash cheat sheet — 100+ commands & idioms for variables, conditionals, loops, functions, pipes, traps, with real one-liners.

awk + sed cheat sheet — 80+ one-liners for text processing, with real examples and common pitfalls.

Vim cheat sheet — 100+ commands covering modes, motions, edits, search, registers, splits, with mnemonics.

curl cheat sheet — 80+ curl commands for GET/POST/auth/upload/download/SSL/proxy, with real examples and pitfalls.

Git command cheat sheet — searchable, with explanations, common mistakes, and real examples.

Docker command cheat sheet — 80+ commands with real examples, common mistakes, and Compose section.

kubectl cheat sheet — 100+ Kubernetes commands with real examples, common pitfalls, and YAML snippets.

Nginx cheat sheet — common configs, location/server blocks, SSL, reverse proxy, gzip, real examples & gotchas.

AWS CLI cheat sheet — 80+ commands for EC2 / S3 / IAM / Lambda / RDS / EKS / CloudFormation with real examples.

Python cheat sheet — 100+ idiomatic Python snippets for string, list, dict, file, async, with real examples.

Go (Golang) cheat sheet — 100+ idiomatic snippets covering syntax, goroutines, channels, generics, errors, stdlib.

Rust cheat sheet — 100+ snippets covering ownership, borrowing, lifetimes, traits, async, error handling.

TypeScript cheat sheet — 100+ snippets for types, generics, utility types, narrowing, async patterns.

React hooks cheat sheet — all 17 built-in hooks (useState / useEffect / useMemo / useTransition / useFormStatus...) with real examples and pitfalls.

Next.js 15 cheat sheet — App Router, Server Components, Server Actions, dynamic routes, with examples and pitfalls.

Vue 3 cheat sheet — Composition API, reactivity, components, directives, Pinia, with side-by-side Options API comparison.

Svelte 5 cheat sheet — runes ($state, $derived, $effect), snippets, props, stores, with Svelte 4 comparison.

Tailwind CSS cheat sheet — 100+ utility classes (spacing, color, flex, grid, typography, responsive) with live preview.

npm / yarn / pnpm cheat sheet — 80+ commands across init, install, scripts, publish, with cross-tool comparison.

Markdown syntax cheat sheet — every rule with live preview side by side, GFM + flavors.

SQL cheat sheet — 100+ statements covering SELECT, JOIN, window functions, indexing, MySQL/PostgreSQL/SQLite differences.

Redis cheat sheet — 80+ commands across strings, hashes, lists, sets, sorted sets, pub/sub, streams, scripts, with examples and pitfalls.

MongoDB cheat sheet — 80+ shell commands & query operators for CRUD, aggregation, indexing, replication.

PostgreSQL cheat sheet — 80+ commands & functions for psql, JSONB, CTEs, window functions, indexing, partitioning, advanced extensions.

Elasticsearch cheat sheet — 80+ Query DSL, mapping, analyzer, aggregation, replication, with real examples.

Interactive regex cheat sheet — quick reference for every flavor (JS, Python, PCRE).

HTTP status code explorer — all 70+ codes with meaning, common causes, real examples, and what to check.

DNS record explainer — all 18 common record types (A, AAAA, CNAME, MX, TXT, SRV, etc.) with syntax, examples, and gotchas.

800+ everyday chengyu — pinyin, origin, usage.

Format, validate, and minify JSON instantly — right in your browser.

Pretty-print, minify, and validate XML in your browser — preserves CDATA, comments, and namespaces.

Format and beautify YAML — re-indent, validate, minify, sort keys.

Format and beautify SQL — supports MySQL, PostgreSQL, BigQuery, SQLite and 17 more dialects.

Format and beautify CSS — sort properties, indent rules, expand or minify.

Format and validate INI / TOML-like config — sort sections, align equal signs.

Minify HTML — strip comments, whitespace, optional attributes, inline CSS/JS. 40-60% smaller.

Minify CSS — strip comments, whitespace, shorten colors, merge selectors. 30-60% smaller.

Minify JavaScript — strip comments, whitespace, optional name shortening. 40-70% smaller.

Lightly obfuscate JavaScript in the browser: strip comments, remove debugger/console calls, and optionally wrap strings with base64.

Minify JSON into a compact single line, optionally sort object keys, and keep everything local.

Validate JSONL line by line, pretty-print it, convert to a JSON array, or export a CSV-like table locally.

JSON to TypeScript interface — paste JSON, get clean interfaces with union types from arrays, optional vs required detection, root name customizable.

Paste JSON or NDJSON samples and infer a Draft 2020-12 style schema with types, required fields, formats, enums, and examples.

TOML formatter + converter — format/validate TOML 1.0, convert TOML ↔ JSON ↔ YAML, with error line/column.

GraphQL formatter + minifier — beautify query/mutation/subscription/schema, validate syntax, copy minified single-line for HTTP body.

Audit OpenAPI JSON or YAML for endpoint coverage, missing operation IDs, security gaps, and weak response documentation.

Inspect package-lock.json, pnpm-lock.yaml, or yarn.lock for duplicate versions, risky sources, prereleases, and missing integrity.

Convert Markdown to clean HTML — headings, lists, code, links, images, tables — instant live preview, browser-only

HTML to Markdown — paste rich content, get clean .md with links, code, tables, lists preserved.

Markdown editor with live split-pane preview — GFM tables, fenced code with syntax highlight, math, emoji, table of contents, export as HTML / PDF-ready.

Build Markdown tables visually — add/remove rows, column alignment, paste from Excel / CSV — browser-only

Convert CSV to JSON or JSON to CSV — handles quoted commas, newlines in cells, custom delimiter — browser-only

Convert uploaded or pasted CSV into clean Markdown tables with quoted-cell support, locally in the browser.

Convert CSV files to tab-separated values while preserving quoted commas, quotes, and multiline cells locally.

Turn tab-separated files into standards-friendly CSV with proper quoting, download, and local processing.

Remove duplicate CSV rows by full row or selected key columns from uploaded files, locally and safely.

Upload or paste CSV, keep only selected columns by name or index, and export a smaller privacy-safe file.

Sort uploaded CSV rows by a selected column with numeric-aware ordering and local-only processing.

Filter uploaded CSV rows by column value using contains, equals, or regex, with local browser processing.

Flip CSV rows and columns from uploaded files or pasted data, with ragged-row handling and local output.

Standardize CSV header rows to snake_case, kebab-case, camelCase, or Title Case before imports and scripts.

Upload CSV and get a quick Markdown profile of filled, missing, unique, numeric, min, max, and average values.

Upload CSV or TSV and profile missing values, inferred types, invalid cells, duplicate rows, whitespace issues, top values, and numeric outliers.

Triage a mixed batch locally for file type mismatches, duplicate candidates, metadata privacy, archive risks, and next-step tools.

Upload files and inspect filename, size, browser MIME type, extension, and magic-byte signature locally.

Upload or paste text and convert CRLF, CR, and LF endings to a consistent LF or CRLF output locally.

Upload a text file and remove BOM, null bytes, trailing spaces, and excessive final blank lines locally.

Upload Markdown and extract inline links, reference links, images, and bare URLs into a local CSV.

Upload HTML and extract anchors, images, scripts, stylesheets, canonicals, and meta URLs into CSV locally.

Upload a batch, generate safe new filenames with sequence numbers and case rules, then export a CSV plan.

Upload PDFs and extract document metadata, page-count hints, encryption flags, and producer details locally.

Inspect PDF MediaBox and CropBox dimensions to catch mixed page sizes before print, merge, or upload.

Inspect DOCX, XLSX, and PPTX package structure for macros, media, embedded objects, custom XML, and size hotspots.

Read a ZIP central directory locally and flag traversal paths, encryption, duplicate names, and risky ratios.

Upload TTF or OTF files and extract family names, PostScript names, version, units per em, glyph count, and table list.

XML to JSON converter — preserves attributes, nested elements, CDATA. Reversible.

Convert between YAML and JSON — both directions, pretty-printed, error messages with line numbers — browser-only

Compute MD5 / SHA-1 / SHA-256 / SHA-384 / SHA-512 hashes — all five at once, browser-only

Compute SHA-1, SHA-256, SHA-384, or SHA-512 hashes for uploaded files entirely in the browser.

Paste an expected checksum, upload a file, and verify SHA digest matches locally before installing or sharing.

Upload a batch and find exact duplicate files by SHA hash locally, with a Markdown cleanup report.

Upload a small file and convert it to raw Base64 or a data URL locally for embeds, fixtures, and tests.

Paste raw Base64 or a data URL, decode it locally, inspect bytes, and download the reconstructed file.

bcrypt password hash generator + verifier — pick rounds, hash and compare in browser.

Decode JWT header / payload / signature — verify structure, check exp, copy claims — browser-only

Encode JWT — pick algorithm (HS256/HS384/HS512), set header/payload/secret, get token.

Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.

Encode/decode HTML entities — & < > " ' and all numeric refs — browser-only

Base32 + Base58 encoder/decoder — RFC 4648 base32 (Crockford variant too), Bitcoin base58, Solana base58, hex/text/file input.

Number base converter — binary, octal, decimal, hex, and any base 2-36. Bitwise too.

HEX ⇄ RGB ⇄ HSL ⇄ HSV ⇄ CMYK — instant 5-way conversion, live swatch — browser-only

Color blindness simulator — paste hex or upload image, see how it looks to people with protanopia / deuteranopia / tritanopia / monochromacy.

Color contrast checker — WCAG 2.2 AA/AAA compliance for normal/large text, real-time grade.

HTML named colors — all 147 CSS color names with hex/RGB/HSL, searchable + sortable.

CSS Grid generator — visually design grid layouts (rows/cols/gap/areas), copy CSS code, fully responsive.

CSS grid visual generator — drag to set columns/rows, place grid-area named regions, copy ready CSS + HTML, with 12 layout templates.

CSS clamp() fluid typography generator — min/max font size, viewport range, full type scale (h1-h6 + body), copy CSS / Tailwind.

CSS font stack generator — system-safe font families with full Win/Mac/Linux/Android/iOS fallback chains, with CJK fallbacks, copy as CSS/Tailwind/SwiftUI.

CSS shadow generator pro — multi-layer box-shadow + text-shadow + filter:drop-shadow, with Material/Tailwind/Apple shadow presets and dark-mode preview.

CSS transform generator — rotate/scale/skew/translate (2D + 3D) with live preview, copy CSS, 12 preset combos.

CSS cubic-bezier editor — drag two control points, preview live with bouncing ball + scaling box + opacity fade, copy CSS / JS / Framer Motion / GSAP / SVG path.

Glassmorphism CSS generator — backdrop-filter blur + transparency + border, live preview with 8 background presets, copy CSS/Tailwind/SwiftUI.

Gradient mesh generator — 4-12 control points with bilinear blend, output as SVG, PNG, CSS multi-radial-gradients fallback for older browsers.

Compress one image to a target KB size locally with quality search, automatic downscaling, preview, and download.

Image resizer — resize JPG/PNG/WebP by pixels/%/preset, fully client-side, no upload.

Image format converter — JPG ↔ PNG ↔ WebP ↔ AVIF, batch + transparent background handling, 100% client-side.

Image cropper — drag to crop, fixed ratios (1:1 / 16:9 / 9:16 / 4:3), zoom, rotate, fully client-side.

Image watermark — text or image watermark with position grid, opacity, tile mode, batch processing.

Inspect PNG, JPEG, GIF, WebP, and SVG dimensions, bit depth, ICC, EXIF, XMP, animation, and notes.

Scan uploaded images for EXIF, GPS, camera, software, dates, XMP, and ICC privacy indicators.

Audit SVG viewBox, dimensions, scripts, external references, styles, ids, classes, title, and desc tags.

Code screenshot generator (Carbon-like) — syntax highlight, beautiful gradient backgrounds, window chrome, export PNG/SVG for X / blog covers.

Image compressor — squeeze JPG/PNG/WebP without server upload, with quality slider, batch mode, file size comparison.

Generate SEO meta tags — title, description, Open Graph, Twitter Card, Schema.org.

QR code decoder — drag a QR image or paste URL, see the text/URL inside, plus phishing & risky-link warnings.

Drop a folder of QR images and get every decoded URL in one table — fast batch audit for packaging, posters, and print runs.

Regex from examples — paste positive matches + negative non-matches, get a regex that hits all positives and rejects all negatives, with multiple candidate patterns ranked by specificity.

Regex visualizer — see your pattern as a railroad diagram + matching state machine, with capture groups highlighted.

Test JavaScript regex live — match highlighting, group capture, replace preview, flag toggles — browser-only

Compare two blocks of text — line-by-line additions, deletions, equal — colour highlighted, browser-only

Convert text between camelCase, snake_case, kebab-case, PascalCase, Title Case, UPPER, lower — instant, browser-only

Turn any title into a clean URL slug — lowercase, dashes, ASCII-safe transliteration, multiline batch — browser-only

Validate emails — RFC 5321 syntax + bulk paste + disposable detection + MX hint.

UTM link builder — track campaign source, medium, name. GA4/Google Analytics compatible.

Generate v4 random, v7 time-ordered, NIL, and Short UUIDs instantly — entirely in your browser.

Generate realistic mock JSON / CSV / SQL data — names, emails, dates, addresses, nested objects.

CSS px ↔ rem ↔ em converter — visual scale, base font size adjustable.

HTML table to CSV converter — paste HTML or full page source, extract all tables, get CSV/TSV/JSON/Excel-ready output with header detection + colspan/rowspan handling.

Upload or paste HTML and extract forms, methods, actions, fields, labels, required flags, autocomplete, password fields, and security risks.

Extract, deduplicate, inspect, copy, and export query parameters from one URL or many URLs locally.

TypeScript to Zod schema converter — paste interface/type, get z.object() schema, supports unions/optionals/nested/generics/enum/Record/Map/Set.

.env file validator — parse Bash-style .env, detect dups / missing required / unsafe values / leaked secret patterns; cross-compare prod / staging / dev envs.

Audit OpenAPI JSON or YAML for endpoint coverage, missing operation IDs, security gaps, and weak response documentation.

Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives.

Audit raw response headers for HSTS, CSP, cookie flags, MIME sniffing, clickjacking, referrer, and permissions policy gaps.

Inspect Content-Security-Policy directives for unsafe sources, missing fallbacks, framing gaps, object-src, base-uri, and reporting coverage.

Inspect package-lock.json, pnpm-lock.yaml, or yarn.lock for duplicate versions, risky sources, prereleases, and missing integrity.

Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.

Upload a Chrome DevTools HAR file and get a local performance, cache, host, asset, status, and security-header report.

Paste sitemap XML and audit URL count, HTTP links, duplicates, trailing-slash conflicts, query parameters, lastmod freshness, and extensions.

Generate Apache .htaccess — HTTPS redirect, www toggle, gzip, cache headers, hotlink protection.

Generate robots.txt with templates for common crawlers (Google, Bing, AI scrapers).

Cron expression explainer — paste any cron, get plain English/Chinese + next 20 runs + visual time grid.

Visual crontab builder + human-readable explanation + next run preview.

Linux permission (chmod) calculator — convert between octal (755), symbolic (rwxr-xr-x), and ls -l forms, with safety warnings.

Unix timestamp ⇄ human date — seconds / milliseconds / ISO 8601 — UTC and local — browser-only

Clean noisy logs by removing timestamps, ANSI colors, blank lines, long lines, or non-error entries in your browser.

Paste logs and group repeated errors, warnings, stack traces, HTTP statuses, endpoint patterns, and time ranges into a local incident report.

Scan .env files, config snippets, and CI logs locally for likely API keys, tokens, private keys, JWTs, and database URLs.

Inspect package-lock.json, pnpm-lock.yaml, or yarn.lock for duplicate versions, risky sources, prereleases, and missing integrity.

Audit OpenAPI JSON or YAML for endpoint coverage, missing operation IDs, security gaps, and weak response documentation.

Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives.

Audit raw response headers for HSTS, CSP, cookie flags, MIME sniffing, clickjacking, referrer, and permissions policy gaps.

Inspect Content-Security-Policy directives for unsafe sources, missing fallbacks, framing gaps, object-src, base-uri, and reporting coverage.

Upload a Chrome DevTools HAR file and get a local performance, cache, host, asset, status, and security-header report.

Paste sitemap XML and audit URL count, HTTP links, duplicates, trailing-slash conflicts, query parameters, lastmod freshness, and extensions.

Generate eval cases, pass criteria, and edge cases from an AI feature, risks, and user path.

Paste CSV or TSV, get a monospace table that lines up: +--+ ASCII, Unicode box, Markdown, with real CJK width

Complete 0–127 ASCII table: decimal, hex, octal, binary, character, name, HTML entity and escape — control codes explained, click to copy, fully searchable.

Code 128 / EAN-13 / UPC-A / Code 39 — generate scannable 1D barcodes, export SVG or PNG, fully offline.

Find duplicates and keep one clean copy of base64 blocks from pasted text or uploaded local files.

Extract, dedupe, and export base64 blocks from pasted text or uploaded local files.

Convert base64 blocks from pasted text or uploaded local files.

Validate and explain issues in base64 blocks from pasted text or uploaded local files.

Normalize, sort, and prepare base64 blocks from pasted text or uploaded local files.

Base64 ⇄ hexadecimal at the byte level, no text encoding in between — standard or URL-safe, your separator and case, runs in your browser

Border radius generator — independent 8-corner control + blob shape randomizer, live preview, copy CSS or SVG path.

Pad delimited rows into an even monospace grid, like column -t, with correct CJK width — browser-only

Find duplicates and keep one clean copy of credit card numbers from pasted text or uploaded local files.

Extract, dedupe, and export credit card numbers from pasted text or uploaded local files.

Convert credit card numbers from pasted text or uploaded local files.

Validate and explain issues in credit card numbers from pasted text or uploaded local files.

Normalize, sort, and prepare credit card numbers from pasted text or uploaded local files.

Luhn-valid fake card numbers for payment-integration testing — Visa, Mastercard, Amex, Discover, JCB, Diners — non-real, sandbox-only — browser-side

Design buttons that look pressable — 3D raised, neumorphic, glass — with a live preview you can hover & press, plus full :hover/:active CSS export

Dial in blur, brightness, contrast, grayscale, sepia, hue-rotate, saturate, invert, opacity + drop-shadow with live preview — copy the filter string

Visually build @keyframes — edit keyframes, set transform/opacity/color, live-preview, and copy production-ready CSS — browser-only

CSS @media query + responsive breakpoint generator — Tailwind / Bootstrap / Material presets, mobile-first vs desktop-first, dark mode, hover, reduced-motion, aspect-ratio.

Design custom scrollbars visually — exports WebKit + Firefox-standard CSS, live preview, one-click copy — browser-only

Score any CSS selector as an (a, b, c) triple, compare which rule wins the cascade, and see exactly which digit decided it — browser-only

Paste CSS declarations, get a React inline style object — kebab keys camelCased, vendor prefixes handled, optional bare numbers, browser-only

Pure-CSS triangles via the border trick — 8 directions, live preview, copy both border + clip-path CSS — browser-only

Find duplicates and keep one clean copy of css variables from pasted text or uploaded local files.

Extract, dedupe, and export css variables from pasted text or uploaded local files.

Convert css variables from pasted text or uploaded local files.

Validate and explain issues in css variables from pasted text or uploaded local files.

Normalize, sort, and prepare css variables from pasted text or uploaded local files.

Turn CSV into CREATE TABLE + INSERT statements — type inference, safe value escaping, MySQL / PostgreSQL / SQLite — browser-only

Turn a CSV table into clean, indented XML — name the root and row elements, columns as elements or attributes, escaped output. Browser-only.

Turn a spreadsheet export into a clean YAML array of objects — RFC 4180 quoting, optional type inference, browser-only

Paste a curl command, get JS fetch / Python requests / Node axios / PHP cURL / Go net/http — parsed locally, instant

Find duplicates and keep one clean copy of domain names from pasted text or uploaded local files.

Extract, dedupe, and export domain names from pasted text or uploaded local files.

Convert domain names from pasted text or uploaded local files.

Validate and explain issues in domain names from pasted text or uploaded local files.

Normalize, sort, and prepare domain names from pasted text or uploaded local files.

Visual .editorconfig builder — indent, charset, line endings, trailing whitespace, per-glob overrides — browser-only

Find duplicates and keep one clean copy of email addresses from pasted text or uploaded local files.

Extract, dedupe, and export email addresses from pasted text or uploaded local files.

Convert email addresses from pasted text or uploaded local files.

Validate and explain issues in email addresses from pasted text or uploaded local files.

Normalize, sort, and prepare email addresses from pasted text or uploaded local files.

Hide your email from scraper bots — HTML entities, [at]/[dot] text, ROT13+JS link — browser-only, one-click copy

Fill in your details, pick a template, get table-based inline-style HTML that pastes cleanly into Gmail and Outlook — 100% browser-only

Convert .env environment variables to JSON and back, with quote escaping, export prefix, and optional type inference, all in your browser

Find duplicates and keep one clean copy of environment variables from pasted text or uploaded local files.

Extract, dedupe, and export environment variables from pasted text or uploaded local files.

Convert environment variables from pasted text or uploaded local files.

Validate and explain issues in environment variables from pasted text or uploaded local files.

Normalize, sort, and prepare environment variables from pasted text or uploaded local files.

Strip illegal characters and make any string a safe cross-platform filename, in your browser

Batch find-and-replace on big text — regex, $1 capture groups, whole-word, case toggle, multiple chained rules — runs entirely in your browser

Flexbox playground — toggle every container and item property on a real flex box and copy the exact CSS. direction, justify, align, gap, order, grow/shrink/basis, align-self. 100% client-side.

GitHub README badge generator — shields.io-style badges, 50+ presets (build/version/license/coverage/etc), custom labels, copy as Markdown/HTML/AsciiDoc/RST.

Pick your stack — Node, Python, Go, Docker, macOS, VS Code — and get a deduped, sectioned .gitignore. Browser-only.

Offset, hex bytes and ASCII side by side, the classic xxd / hexdump -C layout, fully in your browser

HMAC-SHA1/256/384/512 — message + secret key, output in hex and base64, key read as UTF-8/hex/base64 — 100% in-browser

Beautify minified or messy HTML into clean indented markup, browser-only

Build an HTML table visually — rows/columns, header cells, alignment, borders, zebra stripes, paste CSV/TSV — copy clean markup, browser-only

Paste an HTML <table>, get clean JSON, array of objects or 2D array, type inference, browser-only

Paste HTML, get React-ready JSX — class becomes className, inline styles become objects, tags self-close. Browser-only.

Generate Apache/Nginx .htpasswd lines — bcrypt, apr1 (MD5), SHA-1 — multi-user, copy, download — 100% browser-only

Find duplicates and keep one clean copy of http headers from pasted text or uploaded local files.

Extract, dedupe, and export http headers from pasted text or uploaded local files.

Convert http headers from pasted text or uploaded local files.

Validate and explain issues in http headers from pasted text or uploaded local files.

Normalize, sort, and prepare http headers from pasted text or uploaded local files.

Turn INI / .cfg / .conf into JSON and back, with section nesting, comment stripping and optional type inference, all in your browser

Type an IPv4 CIDR and get network, broadcast, host range, mask, wildcard, class and subnet splits — browser-only.

IPv4 dotted-quad to 32-bit integer, binary and hex, both directions, browser-only

Find duplicates and keep one clean copy of ipv4 addresses from pasted text or uploaded local files.

Extract, dedupe, and export ipv4 addresses from pasted text or uploaded local files.

Convert ipv4 addresses from pasted text or uploaded local files.

Validate and explain issues in ipv4 addresses from pasted text or uploaded local files.

Normalize, sort, and prepare ipv4 addresses from pasted text or uploaded local files.

Find duplicates and keep one clean copy of ipv6 addresses from pasted text or uploaded local files.

Extract, dedupe, and export ipv6 addresses from pasted text or uploaded local files.

Convert ipv6 addresses from pasted text or uploaded local files.

Validate and explain issues in ipv6 addresses from pasted text or uploaded local files.

Normalize, sort, and prepare ipv6 addresses from pasted text or uploaded local files.

Paste a JS object literal or JSON5, get strict JSON: quote bare keys, swap single quotes, strip comments and trailing commas, runs in your browser

Structural JSON compare — added / removed / changed keys by path, three-colour tree, browser-only

Flatten nested JSON to dot-notation keys and unflatten it back — choose the delimiter and array style, types preserved, browser-only.

Sort JSON object keys alphabetically, recurse into nested objects, asc or desc, values untouched, runs in your browser

JSON to C# class or record — paste JSON, get PascalCase properties with System.Text.Json or Newtonsoft attributes, nested classes, nullable T?, init setters, DateTime detection.

Turn a JSON array (or object) into clean CSV — flattens nested keys, escapes per RFC 4180, custom delimiter, UTF-8 BOM for Excel — browser-only

JSON to Dart / Flutter class — paste JSON, get final fields, camelCase names, factory fromJson, toJson, null-safe T?, nested classes, and optional @JsonSerializable codegen.

JSON to Go struct — paste JSON, get typed structs with json tags, exported fields, nested sub-structs, pointers for nullable, int64 and omitempty options.

JSON to Java POJO, record, or Lombok @Data — paste JSON, get camelCase fields with getters/setters, Jackson @JsonProperty or Gson @SerializedName, nested classes, primitive vs boxed inference.

JSON to Kotlin data class — paste JSON, get val properties, camelCase fields, nullable T?, nested classes, and kotlinx.serialization @SerialName, Gson @SerializedName, or Moshi @Json annotations.

Paste a JSON array of objects, get a clean GitHub-flavored Markdown table. Key union, pipe escaping, alignment, all in your browser.

JSON to PHP array — paste JSON, get a clean associative or indexed array with short [] or array() syntax, 2/4 indent, trailing comma, and an optional <?php return …; wrapper.

JSON to Protobuf — paste JSON, get proto3 message definitions with inferred scalar types, incrementing field numbers, snake_case fields, repeated arrays, and named nested messages.

JSON to Python — paste JSON, get @dataclass or Pydantic v2 models with type hints, Optional inference, nested classes, snake_case fields and aliases.

Turn a JSON object into a URL query string — repeat, key[], or comma arrays, bracket-nested objects, sorted, skip-empty — and back to JSON, 100% in your browser

JSON to Rust struct — paste JSON, get serde-derived structs with snake_case fields, serde rename, Option for nullable, Vec for arrays, nested sub-structs.

Paste JSON, get Scala case classes. Nested objects become child classes, arrays become List, null becomes Option, all in your browser.

Turn a JSON array into ready-to-run INSERT statements, MySQL / PostgreSQL / SQLite dialects, browser-only

JSON to Swift Codable — paste JSON, get struct or class types conforming to Codable, camelCase properties, a CodingKeys enum for non-matching keys, Optional T? for nullable fields, and nested types.

Turn a JSON array into tab-separated values you can paste straight into Excel or Google Sheets, with header toggle and safe escaping, all in your browser

Convert JSON to clean, indented XML — @attr/#text conventions, custom root, escaped output. Browser-only.

Convert JSON to clean YAML — block scalars for multiline strings, optional key sorting, 2/4-space indent, line-numbered errors — browser-only

JSONPath / JMESPath query tester — paste JSON, write a path, see matched values + matched paths highlighted live.

Find duplicates and keep one clean copy of jwt tokens from pasted text or uploaded local files.

Extract, dedupe, and export jwt tokens from pasted text or uploaded local files.

Convert jwt tokens from pasted text or uploaded local files.

Validate and explain issues in jwt tokens from pasted text or uploaded local files.

Normalize, sort, and prepare jwt tokens from pasted text or uploaded local files.

Compare two lists line by line: only in A, only in B, in both, and merged — all in your browser

Turn a column of lines into a JSON array, with type inference, dedupe and pretty print, and split it back to lines, all in your browser

Estimate daily and monthly LLM spend from tokens, request volume, and editable model prices.

Find duplicates and keep one clean copy of mac addresses from pasted text or uploaded local files.

Extract, dedupe, and export mac addresses from pasted text or uploaded local files.

Convert mac addresses from pasted text or uploaded local files.

Validate and explain issues in mac addresses from pasted text or uploaded local files.

Normalize, sort, and prepare mac addresses from pasted text or uploaded local files.

Turn Markdown into React-ready JSX — one paste from README to a real component, with class becoming className and code blocks intact. Browser-only.

File extension ⇄ MIME type lookup — 130+ types, both directions, copy the exact Content-Type — browser-only

Generate URL-safe NanoIDs with a custom alphabet, adjustable length, and a live collision-probability readout — entirely in your browser.

Generate a list of numbers from start to end by step or count, with zero-padding, prefix, suffix and any separator, all in your browser

See your og:title, og:image and twitter:card exactly as Google, X, Facebook, LinkedIn, Slack and Discord will render them — before you ship.

Check password strength — entropy, time-to-crack, breach pattern check (offline).

Java/Spring .properties to JSON and back, with dotted-key nesting, line continuations and full escape handling, all in your browser

Unicode ⇄ Punycode for internationalized domains — münchen.de ⇄ xn--mnchen-3ya.de — per-label, email-aware, browser-only

Parse a URL query string into JSON and rebuild a query string from JSON — two-way, live, with array + nested object conventions — 100% in your browser

Turn literal text into a safe regex pattern: a.b becomes a\.b, copy the ready /…/ form, reverse it too, all in your browser

Find duplicates and keep one clean copy of semantic versions from pasted text or uploaded local files.

Extract, dedupe, and export semantic versions from pasted text or uploaded local files.

Convert semantic versions from pasted text or uploaded local files.

Validate and explain issues in semantic versions from pasted text or uploaded local files.

Normalize, sort, and prepare semantic versions from pasted text or uploaded local files.

Strip comments and whitespace from SQL — collapse to one compact line, string literals stay untouched, runs entirely in your browser.

Escape & unescape strings for JSON, JS, Java, C, SQL, Shell, HTML, CSV & regex — both directions — browser-only

Levenshtein edit distance, Dice, Jaro-Winkler and LCS side by side, with a 0-100% match score, all in your browser

SVG optimizer — strip comments/metadata/empty attributes, round path decimals, collapse useless groups, minify in browser. No upload.

Inline any SVG as a data URI — URL-encoded (smaller) or base64 — with ready-to-paste CSS, HTML and bare-URI output, side-by-side size diff, 100% in-browser.

Paste SVG, get a React component — attributes camelCase, style becomes an object, wrap with {...props} passthrough. Browser-only.

Convert tabs to spaces and spaces to tabs, real tab-stop alignment, leading-indent or whole-line, all in your browser

Tab-separated data to JSON, header detection, type inference, quoted tab/newline fields, browser-only

Pick a base size + ratio (Major Third, Perfect Fourth, Golden…) and get a full modular type scale with px + rem, live preview, and CSS / Tailwind / SCSS export — browser-only

Sortable, URL-safe unique IDs — batch generate, monotonic mode, decode the timestamp back out — 100% in your browser

Inspect any text character-by-character: code points, UTF-8/UTF-16 bytes, HTML entities, JS escapes, names, and hidden zero-width / confusable glyphs.

Normalize text to NFC, NFD, NFKC or NFKD, see code-point and byte counts shift, spot which characters changed, copy in one click, all in your browser

Find duplicates and keep one clean copy of urls from pasted text or uploaded local files.

Extract, dedupe, and export urls from pasted text or uploaded local files.

Convert urls from pasted text or uploaded local files.

Validate and explain issues in urls from pasted text or uploaded local files.

Normalize, sort, and prepare urls from pasted text or uploaded local files.

Break any URL into protocol, host, port, path, query and hash, with a decoded parameter table, all in your browser

Parse any User-Agent string into browser, engine, OS, device type and bot flag — paste a log line or read your own — browser-only

Count UTF-8 bytes, UTF-16 code units, Unicode code points and characters in any string, right in your browser

Find duplicates and keep one clean copy of uuids from pasted text or uploaded local files.

Extract, dedupe, and export uuids from pasted text or uploaded local files.

Convert uuids from pasted text or uploaded local files.

Validate and explain issues in uuids from pasted text or uploaded local files.

Normalize, sort, and prepare uuids from pasted text or uploaded local files.

Turn repeating XML records into a CSV table, columns are the union of every field, attributes optional, custom delimiter, RFC 4180 escaping, browser-only

Paste XML, get clean YAML. Attributes as @ keys, repeated tags as lists, mixed text kept, valid YAML 1.2. Browser only.

Turn a YAML list of objects into an RFC 4180 CSV — column union, JSON or flattened nested values, comma / semicolon / tab, browser-only