Скачать или смотреть Resolving the Power Query Expression Error: Converting Record to Text in Power Query

Struggling with the Power Query Expression error stating that a value of type "Record" cannot be converted into type "Text"? This guide provides a clear solution and alternative approaches for handling JSON requests in Power Query.
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Understanding and Resolving the Power Query Expression Error

Power Query is a powerful tool in Excel and Power BI that allows users to manipulate data from various sources effectively. However, even experienced users can face challenges, such as the frustrating expression error that states:

"A value of type 'Record' cannot be converted into type 'Text'".

This error commonly occurs when attempting to send a JSON request but having a mismatch in data types. Today, we’ll explore why this issue arises and how to resolve it effectively.

The Problem: What Causes the Expression Error?

The error typically emerges during the execution of a Power Query script where JSON data is involved. Specifically, the issue arises when the code attempts to convert a complex structure, like a Record, into a simpler type, like Text.

Example Scenario

In our illustrative example, we have a user attempting to send a JSON-formatted request. The problem stems from using:

[[See Video to Reveal this Text or Code Snippet]]

In this line, BuildQueryString likely results in a Record, which cannot be directly processed as Text, leading to the aforementioned error.

Solution: Simplifying the Power Query Script

The good news is that the solution is straightforward. Here’s how you can adjust the Power Query script to avoid this type mismatch and successfully send your JSON data.

Step-by-Step Adjustment

Replace the BuildQueryString Line
Change the line that converts the constructed body into text. Instead of trying to build a query string, you should directly use the JSON body you have.

From this:

[[See Video to Reveal this Text or Code Snippet]]

To this:

[[See Video to Reveal this Text or Code Snippet]]

Remove Unnecessary Lines
Since you're directly using the JSON body, eliminate the intermediate steps that parse the JSON:

[[See Video to Reveal this Text or Code Snippet]]

These lines are no longer needed when sending the request in the typical JSON format.

Alternative Approach: Constructing the JSON in M

If you'd like to construct your JSON request directly within M, consider using the JSON.FromValue function. Here’s a sample structure:

[[See Video to Reveal this Text or Code Snippet]]

Advantages of This Method

Simplicity: You’re building the JSON object in the native Power Query format, which can be more intuitive.

Less Error-Prone: Reducing the steps between creating the data structure and sending it minimizes the risk of data type issues.

Conclusion

The Power Query error regarding record-to-text conversion can seem daunting, but with a clear understanding and some straightforward adjustments, it’s entirely solvable. By simplifying your script and directly incorporating the JSON body, you can enhance the reliability of your data requests. Remember, leveraging M's native capabilities to build JSON can save time and prevent errors in your queries.

If you have further questions or need additional assistance, feel free to reach out!