Ask HN: How are you cleaning and transforming data before imports/uploads?

Hi all,

I’m curious how folks handle the prep work for data imports/uploads into systems like Salesforce, Workday, NetSuite, or really any app that uses template based import for data loading, migration, or implementation.

Specifically: - How do you manage conversions/transformations like formatting dates, getting everything aligned with the templates, mapping old codes to new ones, etc.

- Are you primarily using Excel, custom scripts, Power Query or something else?

- What are the most tedious/painful parts of this process and what have you found that works?

Really appreciate any insights and am curious to learn from everyone's experience.