FlowingDev / The Toolbox
Format, validate, inspect and transform JSON, XML, YAML, JWTs, Markdown and more — fast, private, zero server round-trips.
The Toolbox
Pick your weapon
Viewers
JSON Viewer
Pretty-print, validate and squish JSON. No server involved.
XML Viewer
Tame ugly XML and poke around its tree structure.
JWT Viewer
Crack open a JWT and peek at its header, payload and expiry.
YAML Viewer
Check your YAML's indentation sins and flip it to/from JSON.
Markdown Viewer
Type Markdown, watch it render live — zero XSS surprises.
SQL Viewer
Untangle messy SQL into something your eyes can parse.
HTTP Message Viewer
Paste raw HTTP and get a readable, field-by-field breakdown.
HTML Viewer
Drop in HTML and watch it render right beside the source.
Converters & encoders
Base64 Tools
Base64 in, Base64 out, with a live preview — no guesswork.
URL Encoder
URL-encode or decode whole links or just the fiddly bits.
Hash Generator
Crank out MD5 and SHA hashes without pinging a server.
CSV Tools
Turn messy CSV into a table, or flip it to and from JSON.
Cron Expression Parser
Decode cron syntax into plain English and the next run times.
Epoch Converter
Flip Unix timestamps to dates and back, plus a live clock.
CSS Unit Converter
Convert px, rem, em, vw and friends, and build fluid clamp() values.
Validators & testers
Network & APIs
cURL to Code
Turn a cURL command into fetch, Axios, Python, Go or PHP code.
HTTP Message Builder
Build raw HTTP requests or responses, headers, body and files included.
Subnet / CIDR Calculator
Crunch an IPv4 CIDR into network, broadcast, hosts and masks.
GraphQL Formatter
Make GraphQL queries and schemas readable (or squish them down).
SVG & images
SVG Optimizer
Clean, shrink and preview SVGs, then export as Data URI or Base64.
Favicon Generator
Turn one image into every favicon size plus the head tags.
Image ↔ Base64
Flip images to Base64/Data URI and back, with resize and compression.
Image Converter
Convert JPG/PNG/GIF to WebP (or back), resize, compress, download.
Security
Encryption Tools
Lock and unlock text with password-based AES encryption.
CSP Checker
Scan your CSP header for sketchy directives and gaps.
Security Headers
Get a report card on your security headers, plus fixes.
Password Strength
See how fast a password would crack, patterns and all.
SRI Hash Generator
Generate SRI hashes and the script/link tags that use them.
HMAC Generator
Sign payloads with HMAC and double-check webhook signatures.
Editors
JS / TS Tools
Tidy up or shrink your JS/TS — your pick, your style.
Code Indenter
Fix busted indentation across JS, TS, JSON, HTML, CSS, YAML and more.
JSON Editor
Edit JSON as text, tree, table or form — side by side, then download.
XML Editor
Edit XML as text, tree, table or form — side by side, then download.
YAML Editor
Edit YAML as text, tree, table or form — side by side, then download.
Markdown Editor
Write Markdown and rich text side by side — toolbar included, always in sync.
HTML Editor
Edit HTML with a live preview, auto-formatting and a one-click download.
Generators
UUID Generator
Spit out one or a thousand UUIDs, formatted your way.
Random Generator
Generate random numbers or strings with your own charset.
Lorem Ipsum Generator
Fill the void with as much Lorem Ipsum as you need.
Password Generator
Cook up strong passwords with length and charset to taste.
QR Code Generator
Make QR codes from any text or link, with color and size options.
Barcode Generator
Generate Code 128, EAN-13, UPC and more barcodes, ready to download.
Mock Data Generator
Spin up realistic fake JSON records for your tests, field by field.
Colors
Color Picker & Converter
Pick a color and juggle it between HEX, RGB, HSL, OKLCH and more.
Web Palette Generator
Turn one brand color into a full site palette, then preview it live.
Contrast Checker
Check WCAG contrast and get an instant fix if it fails.
Random Color Generator
Spin up random colors that actually look distinct from each other.
Color Scale Generator
Build a Tailwind-style 50-950 scale from any color, export-ready.