Every dev utility, one page
JSON and YAML formatters, regex playgrounds, hash generators, encoders, schedulers, and the network odds & ends you reach for once a sprint. All free. No signup. Mostly client-side.
What's on this page? Roughly thirty developer utilities, grouped by category. Each is its own dedicated tool with its own URL — this is the discovery surface, not a wrapper. Click any card to open the full tool.
Who is this for? Backend, frontend, and full-stack engineers who'd rather not install yet another Electron app or paste sensitive data into a paywalled SaaS just to URL-encode a string or pretty-print a JSON blob.
How does it work? Every tool here runs entirely in your browser — your inputs never leave your device. The one exception is the DNS lookup, which has to query a public resolver. There is also a public syllables API at /api/syllables if you need to hit a fixie endpoint from your own code.
Format, validate, convert
JSON / YAML / XML Formatter
Pretty-print, minify, validate. Convert between formats.
JSON Path Explorer
Query and filter JSON with live JSONPath highlighting.
JSON Schema Validator
Validate against draft-4 through 2020-12 with detailed errors.
CSV ↔ JSON Converter
Round-trip CSV and JSON with delimiter and header options.
Table Converter
CSV ↔ JSON ↔ Markdown ↔ HTML with grid editor.
Config Converter
YAML / TOML / INI / JSON / .env round-trip.
SQL Formatter
Format / minify SQL with syntax highlighting.
Code Minifier
Minify JS / CSS / HTML in-browser, with size diff.
Encode & hash
Base64 Encoder / Decoder
Text and files. URL-safe encoding supported.
Number Base Converter
Binary, octal, hex, and any base 2–36.
URL Encoder / Decoder
Percent-encoding with URL component parser.
HTML Entity Tool
Named / numeric / hex entities with XSS guidance.
Hash Generator
MD5, SHA-1, SHA-256, SHA-384, SHA-512. Text and files.
Cipher Toolbox
Caesar, ROT13, Atbash, Vigenère, Morse, NATO, Pig Latin.
JWT Decoder & Inspector
Header, payload, claims, expiration. 100% client-side.
UUID Generator
v1, v4, v5, v7. Batch up to 1,000.
Password Generator
Random passwords and passphrases with strength meter.
Inspect, test, schedule
Regex Tester & Explainer
Live highlighting, capture groups, plain-English breakdown.
Cron Builder
Visual schedule builder with English explanations.
Cron Tester
Next 20 runs, timezone support, visual calendar.
Unix Timestamp Converter
Epoch ↔ human-readable, live clock, time arithmetic.
API Request Builder
Build and send HTTP, import / export cURL.
DNS Lookup
A, AAAA, MX, TXT, NS, SOA. Compare resolvers.
Subnet Calculator
Network, broadcast, host range. Split subnets.
chmod Calculator
Octal, symbolic, ls -la output. Setuid / sticky.
File Inspector
Magic bytes, MIME, entropy, hex dump, strings.
Meta Tag Generator
SEO + social previews for Google, Twitter, Facebook.
Text Diff
Side-by-side comparison with highlights.
Code Diff
Syntax-aware diff for 20+ languages.