Programming

Everyday developer utilities — JSON formatting, encoding conversion, hashing, regex and more.

Convert and format JSON, XML, YAML and CSV; encode and decode Base64, Base32, Base58 and Base85; decode JWTs; work out when a cron expression next fires; translate chmod between octal and rwx; calculate IP subnets; parse User-Agent strings; and generate CSS grid, flexbox and gradient declarations. These cover the small "let me just check this" moments in the middle of a task. Everything is processed locally in the browser, so pasting in a token or an internal config value does not send it anywhere — which makes these a reasonable substitute when pasting company data into an online service would be inappropriate.

What people use these for

  • Pretty-print an API response to read what came back
  • Decode a JWT or Base64 blob on the spot
  • Confirm when a cron expression will next run
  • Get the network address and usable host count from CIDR notation

Tools in this category (81)

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