Developer

Quick card per HTTP method (GET, POST, PUT, DELETE, PATCH, …) — safety, idempotence, cacheability, and whether request / response bodies are allowed.

Tick the languages, frameworks, editors, and operating systems you use — get one combined `.gitignore` ready to drop into a fresh repo.

Paste an HTML snippet and get React-ready JSX — `class` becomes `className`, `onclick` becomes `onClick`, void tags self-close, inline styles can be object-ified.

Paste a `Cookie:` request header or a `Set-Cookie:` response header and see each cookie's name, value, attributes, and warnings.

Fill out a form, get a ready-to-paste `<meta>` block — Open Graph for Facebook / LinkedIn / Slack and Twitter Card tags for X / Discord.

Paste any JSON and get a draft-07 JSON Schema that matches its shape — types inferred, formats detected, required fields filled in.

Paste a cURL command — get ready-to-use JS fetch or axios code with headers, body, method, and basic auth handled.

Find the MIME type for a file extension (or the other way around) and learn what each type is for.

Searchable reference for ~50 standard HTTP request, response, CORS, caching, security, and cookie headers.

Encode and decode Base32 (RFC 4648), with standard and base32hex variants — useful for TOTP secrets and Crockford-style IDs.

Browse and search the 256-row ASCII / extended-ASCII table — decimal, hex, octal, binary, and the named control characters.

Sort the keys of a JSON object alphabetically. Optionally recurse into nested objects so the whole document is canonicalized.

Convert internationalized domains between Unicode (`münchen.de`) and Punycode ASCII (`xn--mnchen-3ya.de`).

Run JSONPath queries (`$.store.book[*].author`, `$..price`) against a sample document and see the matching values.

Paste any CSS selector to see its (ID, class, type) specificity, per-token breakdown, and head-to-head comparison with another selector.

Inspect text or a small file as offset + hex bytes + printable ASCII, like `xxd` or `hexdump -C`.

Build a CSS animation visually — pick a preset, tweak duration/easing/iteration, see the preview, and copy the generated keyframes.

Break a URL into protocol, host, port, path, query, and hash. Decode query parameters into a table.

Compute HMAC signatures with Web Crypto — sign webhook payloads, verify API requests, hex or base64 output.

Escape or unescape strings for JSON, JavaScript, HTML, SQL, RegExp, and POSIX shell — pick a flavor, paste, get output.

Bulk-generate ULIDs, NanoIDs, and CUID2 — modern UUID alternatives that are shorter, sortable, or collision-resistant.

Generate bcrypt hashes with adjustable cost factor, or verify an existing hash against a password — runs entirely in your browser.

Spot NBSPs, zero-width characters, bidi marks, and tabs in pasted text — then clean them out.

Build a cron expression by clicking — hourly, daily, weekly, monthly, or fully custom — pairs with the Cron Explainer.

Visually pick grid-template-columns / rows, gap, and item alignment — copy the CSS straight into your project.

Strip whitespace and comments from HTML, CSS, or JavaScript — see the size saved and copy the result.

Visually pick flex-direction, justify-content, align-items, and gap — copy the resulting CSS or Tailwind class.

Build and sign HS256 / HS384 / HS512 JWTs from a header and payload — pairs with the JWT Decoder.

Browse and search every HTTP status code with a plain-language explanation — 60+ codes from 100 to 511.

Generate realistic fake records for testing — names, emails, dates, IDs, lorem — exported as JSON, CSV, or SQL INSERTs.

Pretty-print and validate YAML — fix indentation, sort keys, choose line width, catch errors in place.

Generate TypeScript interfaces from any JSON sample — types are inferred recursively and named after each key.

Compare two JSON documents structurally — see exactly which keys were added, removed, or changed.

Format and beautify SQL across 10 dialects (PostgreSQL, MySQL, BigQuery, Snowflake, T-SQL …).

Translate a cron expression into plain English (or your language) and break down each field.

Encode HTML special characters (& < > " ') or decode entities back to their original characters.

Test JavaScript regular expressions live with highlighted matches and replace preview.

Decode a JSON Web Token to inspect its header, claims, and expiration.

Generate random version-4 UUIDs in bulk, with copy.

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text.

Percent-encode text for URLs, or decode encoded URLs back to text.

Encode text to Base64 or decode Base64 back to text, instantly.

Format, beautify, minify, and validate JSON right in your browser.