Simple, client-side developer tools.
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Smart Scratchpad
Tools
/jwt
JWT Inspector
Decode tokens, inspect claims, check expiry.
/json
JSON Formatter
Format, minify, validate & convert to YAML.
/diff
Text Diff
Side-by-side comparison with inline highlights.
/regex
Regex Tester
Test patterns with live match highlighting.
/hash
Hash, HMAC & Base64
SHA-1/256/384/512 digests, HMAC, and Base64 codec.
/epoch
Epoch Converter
Unix timestamps ↔ human-readable time.
/cron
Cron Explainer
Plain-English schedules with next 5 runs.
/uuid
UUID & ULID
Bulk-generate UUID v4 and ULIDs.
/url
URL Inspector
Parse URLs, list query params, encode & decode.
/csv
CSV ↔ JSON
Convert between CSV and JSON with header mapping.
/ip
IP & Subnet
CIDR math: network, broadcast, netmask, host counts.
/status
HTTP Status Codes
IANA status codes with meaning and RFC references.