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RaimondKempees-7909 asked MartinJaffer-MSFT commented

How to Use Wildcards in Data Flow Source Activity?

In Data Factory I am trying to set up a Data Flow to read Azure AD Signin logs exported as Json to Azure Blob Storage to store properties in a DB. The problem arises when I try to configure the Source side of things. No matter what I try to set as wild card, I keep getting a "Path does not resolve to any file(s). Please make sure the file/folder exists and is not hidden.".

I use the Dataset as Dataset and not Inline. I can click "Test connection" and that works. In the Source Tab and on the Data Flow screen I see that the columns (15) are correctly read from the source and even that the properties are mapped correctly, including the complex types.

The actual Json files are nested 6 levels deep in the blob store. Is that an issue?

I've tried all kinds of wildcards:

  • **

  • /**/*.Json

  • //////*.json

  • tenantId*/*.json

  • *.json

None of it works, also when putting the paths around single quotes or when using the toString function.

Does anyone know if this can work at all?

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Hello @RaimondKempees-7909 and welcome to Microsoft Q&A.

I am confused. You said you are able to see 15 columns read correctly, but also you get 'no files found' error. I do not see how both of these can be true at the same time.

Could you please give an example filepath and a screenshot of when it fails and when it works?

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Hi @MartinJaffer-MSFT ,

Thanks. I am probably more confused than you are as I'm pretty new to Data Factory. I see the columns correctly shown:


If I Preview on the DataSource, I see Json:


The Datasource (Azure Blob) as recommended, just put in the container:


However, no matter what I put in as wild card path (some examples in the previous post, I always get:


Some examples of paths:

Entire path: tenantId=XYZ/y=2021/m=09/d=03/h=13/m=00

Recursive Wildcard paths:



Six levels deep:


... Nothing works. I am probably doing something dumb, but I am pulling my hairs out, so thanks for thinking with me.

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Ahh, I just realized mistake.

Entire path: tenantId=XYZ/y=2021/m=09/d=03/h=13/m=00

There is no .json at the end, no filename. If there is no .json at the end of the file, then it shouldn't be in the wildcard.

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1 Answer

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MartinJaffer-MSFT answered MartinJaffer-MSFT edited


Given a filepath

I was able to see data when using inline dataset, and wildcard path



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