Inspect and convert

Read tokens and convert number bases.

16 tools in this part of the catalogue.

Read a JWT header and payload, with claims shown as dates.

Convert a signed whole number between bases 2 and 36.

Work out the network, host range and mask for an IPv4 or IPv6 prefix.

Turn read, write and execute choices into chmod modes.

Check file bytes against their extensions.

Compare semantic versions and test a range.

Look up HTTP codes in a dated IANA registry snapshot.

Find SPDX identifiers and supplied license metadata.

Inspect snowflake fields or split a prefixed ID.

Inspect ZIP entries or create a local archive.

Explain pasted browser identification fields.

Review selected browser support records.

Diagram tables and declared foreign keys.

Inspect an API specification without calling it.

Inspect a local TTF or OTF file.

Check keys and replace every value.