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Learn how to transform JSON payloads into a specific array of objects format required by react-table, with a simple and reusable mapping function.
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How to Dynamically Create an Array of Objects in React from JSON Payloads

In the world of React development, one common challenge developers face is handling and transforming data from JSON payloads into formats suitable for displaying in components like react-table. If you’re wondering how to take arrays of data and convert them into a structured format, you’ve come to the right place! In this post, we'll explore how to take data from a raw JSON payload and transform it into an array of objects to fit the requirements of a react-table.

The Problem: Arranging JSON Data for React-Table

Suppose you have the following JSON payload after fetching and parsing it:

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The challenge is to convert this structure into a specific format like below:

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To accomplish this, you want to create a function that works dynamically with any number of columns in rawPayload and formats the data correctly.

The Solution: Writing a Dynamic Mapping Function

Here's how you can create a function (tableMap) that will take in the rawPayload and return the desired format. Let’s break down the solution step-by-step.

Step 1: Extract Column Names and Length

Begin by extracting the column names and determining how many rows of data there are. We do this using the Object.keys() and Object.values() methods:

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colNames will hold the keys from the rawPayload, such as ['Names', 'Nums', 'Range'].

length indicates how many rows we need to construct in the resulting array.

Step 2: Initialize the Result Array

Next, initialize an empty array rTableObj, where we will push our results.

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Step 3: Loop Through Each Row

Use a nested loop structure to iterate through the indices of the rows and columns. For each row index, create an entry object to hold the corresponding values for each column name:

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The outer loop iterates through the length of the rows.

The inner loop populates the entry object with data from rawPayload using the current column name.

Step 4: Return the Result

Finally, the function concludes by returning the constructed array of objects:

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Full Function Code

Putting it all together, the complete dynamic mapping function looks like this:

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Conclusion

By following this structured process, you now have a flexible way to convert JSON payloads into an array of objects that can be utilized in a react-table component. Whether your rawPayload structure changes or adjusts, the above function can dynamically adapt to fit your needs. This not only makes your code more manageable but also improves scalability as your data requirements evolve.

Give this a try with your data payloads and watch your tables populate seamlessly!