Developer Tools
Format JSON, decode JWT, generate UUIDs & hashes, test regex, convert bases — your client-side dev swiss knife.
JSON Formatter
Beautify, minify and validate JSON — 100% in your browser.
Base64 Encode / Decode
Convert text to and from Base64 — Unicode-safe, no uploads.
URL Encode / Decode
Percent-encode or decode URLs and query strings — locally.
JWT Decoder
Inspect JWT header and payload — no signature verification.
UUID Generator
Generate cryptographically-secure UUID v4s — bulk & instant.
Hash Generator
Compute SHA-1, SHA-256 and SHA-512 hashes — locally.
Number Base Converter
Convert between binary, octal, decimal & hex — BigInt-powered.
Regex Tester
Test JavaScript regex with live match highlighting & groups.
Markdown Preview
Write Markdown and see the rendered HTML live — side by side.
JSON to CSV
Convert an array of JSON objects into clean CSV — locally.
JSON ↔ YAML Converter
Convert JSON to YAML and YAML back to JSON — no libraries.
HTML Entities Encode / Decode
Escape & unescape HTML entities — live, no uploads.
CSS Minifier & Beautifier
Compress or re-indent CSS — instantly, locally.
JS Minifier & Beautifier
A conservative JS formatter — strip // comments, dedent, beautify.
SQL Formatter
Beautify SQL with uppercase keywords & sensible line breaks.
Cron Expression Parser
Explain a 5-field cron expression and compute its next 5 runs.
HMAC Generator
Compute HMAC-SHA-256/384/512 signatures — locally.
Text ↔ Binary Converter
Convert text to binary and back — UTF-8 safe.
HTTP Status Codes Reference
Searchable reference of 60+ HTTP status codes — click to copy.
.gitignore Generator
Build a project-specific .gitignore in seconds — local, downloadable.
README Generator
Generate a polished README.md from a few inputs — copy or download.
Random Number Generator
Cryptographically-secure random integers — unbiased, local.
Username Generator
Generate memorable usernames — adjective+noun, leetspeak, full names.
CSV ↔ JSON Converter
Convert CSV to JSON and back — RFC 4180 compliant, no uploads.
YAML ↔ JSON Converter
Convert YAML to JSON and back — pure JS, no dependencies.
XML Formatter & Minifier
Beautify or minify XML — handles attributes, CDATA, comments.
JSON to TypeScript
Infer a TypeScript interface from any JSON sample.
HTML to Markdown Converter
Convert HTML to clean Markdown via DOMParser — no regex hacks.
String Escape / Unescape
Escape strings for JS, HTML, CSS, JSON, regex, URL and shell.
JSON Schema Generator
Infer a draft-07 JSON Schema from a sample JSON object.
Code Formatter
Beautify or minify JSON, CSS, HTML, SQL and XML in one tool.
HTTP Headers Decoder
Parse and annotate raw HTTP headers — 60+ known headers.
JSONL Formatter
Beautify, minify and convert JSON Lines — log-friendly.
Dockerfile Generator
Generate multi-stage Dockerfiles for Node, Python, Go, Rust.
.htaccess Generator
Build Apache .htaccess rules — HTTPS, redirects, caching, more.
CSP Builder
Build a Content-Security-Policy header with a clean UI.
bcrypt Hash Generator
Generate a bcrypt-format password hash — local, no uploads.
SSH Key Generator
Generate an RSA keypair via Web Crypto — SPKI / PKCS#8 PEM.
IP Subnet Calculator
Compute network, broadcast, mask and host range for IPv4 / IPv6.
Email Validator
RFC 5322 format check — no DNS lookup, fully client-side.
Credit Card Validator
Luhn checksum + card type detection — 100% private.
ISBN Validator
Validate ISBN-10 and ISBN-13 checksums — mod 11 / mod 10.
IBAN Validator
Mod-97 checksum for International Bank Account Numbers.
chmod Calculator
Convert between octal (755) and symbolic (rwxr-xr-x) permissions.
curl Command Builder
Build a curl command from a friendly UI — shell-safe quoting.
nginx Config Generator
Generate nginx server blocks — static, SPA, proxy, PHP-FPM, HTTPS.
Keyboard Shortcut Reference
Searchable reference of 70+ shortcuts across Windows, macOS, browser, VS Code.
HTML Heading Validator
Check h1–h6 structure for SEO — skips, multiple h1s, empty headings.
llms.txt Generator
Generate an llms.txt file to guide LLMs to your docs.
Truth Table Generator
Generate a truth table for any boolean expression.
Fake Data Generator
Generate fake JSON, CSV or SQL records for testing — 18 fields.
My IP Address
See your public IPv4, IPv6 and WebRTC-discovered IP.
Viewport Inspector
Live viewport size, DPR, orientation and Tailwind breakpoints.
JSONPath Tester
Evaluate JSONPath expressions against JSON — pure JS.
JSON-LD Builder
Build Schema.org JSON-LD snippets for rich results.
TOML ↔ JSON Converter
Convert TOML to JSON and back — pure JS, no deps.
X.509 Certificate Decoder
Decode a PEM X.509 certificate — subject, issuer, validity.
Script Generator
Pre-built bash, PowerShell, Python, Node and git scripts.
YAML Formatter
Beautify or minify YAML — pure JS, no dependencies.