ToolSink

Developer Tools

JSON, Base64, UUID and other utilities for developers.

Developer utilities format and inspect the payloads you work with daily: JSON, XML, HTML, SQL and API responses. You will also find Base64 and URL encoding, UUID generation, regex testing, JWT decoding, timestamp conversion, and a live HTML/CSS/JS playground.

Formatting and decoding happen in your browser — useful when responses contain tokens, private config or production data you do not want to paste into a random online service.

Common tasks

  • Prettify a one-line JSON log from production
  • Decode a JWT header or payload without sending it anywhere
  • Generate SQL INSERT statements from spreadsheet rows
  • Test a REST endpoint with custom headers and body