Data lookup & developer tools
Process data, generate content in your browser, or look up source-backed global references.
Process data
Generate content
Look up country data
Phone numbers
ISO country and territory phone formats
Languages & locales
language and locale recommendations
ID formats
reviewed format references with permanently masked examples
Currencies
ISO 4217 codes and minor units
Time zones
IANA zone names by country
Address formats
reviewed postal field order
Subdivision codes
ISO 3166-2 code reference
Practical guides
01
Turn JSON into TypeScript without trusting the sample
Use a JSON sample to start a TypeScript contract while keeping runtime checks separate.
02Inspect JWT claims without treating them as proof
Read JWT metadata locally for debugging while keeping signature verification and authorization separate.
03URL encoding: encode data, not the whole address
Inspect URL components locally and avoid double-encoding query values or paths.