Power Automate - Create columns in an Excel using JSON
- Jon Russell
- Apr 7, 2022
- 1 min read
Just came up against a very interesting Power Automate problem that I had never come across before. I needed to be able to create an excel file and populate a different data set in a spreadsheet dependent on some criteria.
I thought it would be a matter, of creating an Excel template and then copying it over to a new file location, but not that simple.
I had to first create the Excel file, then get the content metadata and store that in a compose step. This gave me a blank Excel file content, which I could then save anywhere I wanted.
After that I created the file with that file content from the compose step, in SharePoint and gave it a name. Then use Create a table action:
Then, and this is the cool bit, I had to add a row into that table, because I didn't have any row information, I used JSON to create the row based on the values supplied and into the columns I had created. Using key value pairs from the manual trigger and the table column names:
Nice !!
This is such a clever workaround, Jon! I ran into a similar challenge when trying to dynamically generate Excel reports with varying column structures depending on the dataset, and the JSON key-value pair approach you've shown here is exactly the kind of solution I was looking for. It's interesting how automation tools like Power Automate mirror structured thinking in other fields too — students using an Assignment Writing Service UK often face the same challenge of organizing dynamic content into consistent formats. Getting that blank file content from the compose step first is a detail I would have completely overlooked, so thanks for highlighting it. Really clean and practical walkthrough!
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