QUICK ANSWERStart with the tool that matches your immediate input.
Open JSON to XLSX first when its stated purpose matches the result you need now. Use XLSX to JSON only when it solves a separate next task.
This guide is for writers, office teams, students, and data workers. Start with JSON to XLSX when your immediate task is to convert your file or data with the JSON to XLSX directly in your browser. Move to XLSX to JSON only when you also need to convert your file or data with the XLSX to JSON directly 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 XLSX to JSON solves a genuinely different next step.
Both tools sit in Documents & Files, but they handle different inputs or outcomes. Keeping those roles separate reduces repeated work and makes verification easier.