QUICK ANSWERStart with the tool that matches your immediate input.
Open Data URI Generator first when its stated purpose matches the result you need now. Use HTTP Status Code Lookup only when it solves a separate next task.
This guide is for developers, analysts, testers, and technical writers. Start with Data URI Generator when your immediate task is to use the Data URI Generator to inspect, transform, validate, or generate developer data locally in your browser. Move to HTTP Status Code Lookup only when you also need to use the HTTP Status Code Lookup to inspect, transform, validate, or generate developer data locally in your browser.
The goal is not to run two tools automatically. It is to finish the first narrow task, inspect its result, and then decide whether HTTP Status Code Lookup solves a genuinely different next step.
Both tools sit in Developer & Data, but they handle different inputs or outcomes. Keeping those roles separate reduces repeated work and makes verification easier.