Code & Data Tools
Developer tools for everyday coding work: generate test data, diff JSON payloads, test regex patterns, write Markdown, and mint UUIDs — all in your browser, with nothing uploaded.
JWT Decoder
Decode header and payload, expiry status humanized.
DEVELOPERText Diff Checker
Line-by-line comparison, Git-style added/removed highlighting.
DEVELOPERCron Expression Parser
Plain-English explanation plus the next 5 run times.
DEVELOPERJSON Formatter & Validator
Beautify, minify, sort keys — with exact error line and column.
DEVELOPERTimestamp Converter
Epoch to date and back — auto-detects seconds vs milliseconds.
GENERATORFake Data Generator
Realistic test data as JSON, CSV, or SQL — up to 1,000 rows per click.
DEVELOPERJSON Diff Tool
Deep structural comparison: added, removed, changed — key order ignored.
DEVELOPERRegex Tester
Live match highlighting with capture groups and all flags.
EDITORMarkdown Editor
Write with instant preview; export clean HTML or download .md.
GENERATORUUID Generator
Bulk v4 UUIDs from your browser's cryptographic random source.
TEXTText Case Converter
Nine cases from Title Case to camelCase — code-aware conversion.
Built for daily development work
These are the tools developers reach for a dozen times a week. Everything processes locally: your API payloads, regex test strings, and Markdown drafts never leave your device — which matters, because the data developers paste into online tools routinely contains internal hostnames, tokens, and real records. The fake data generator exists precisely so that real customer data never has to appear in a test environment at all.