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Learn how to easily send an array to a GraphQL mutation with Axios in JavaScript. This guide breaks down the process into simple steps.
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How to Pass an Array to a GraphQL Mutation using Axios

In today's post, we're tackling a common problem when working with GraphQL mutations in JavaScript, particularly when using the Axios library for API calls. Many developers find themselves in a situation where they need to send an array of values as part of their mutation requests but encounter difficulties in handling it properly.

The Problem

You may have a GraphQL mutation that you want to execute multiple times, sending different data each time. In your case, you have a scenario where you're trying to pass an array of strings, but the function you've written gets stuck and fails to complete. Here’s a snippet of the problematic code:

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The array, d.options, contains your data in the format ['arr1', 'arr2', 'arr3'], but sending it directly like this causes issues.

The Solution

The key to solving this problem lies in properly formatting the options property that you're passing into your GraphQL mutation. Specifically, you need to convert your array into a JSON string.

Step-by-Step Solution

Update the createMut Function
You need to adjust how the options are prepared in the mutation. Replace:

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with:

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This change ensures that the array is correctly formatted as a JSON string before being sent in the request.

Modify the Function that Handles the Mutation Calls
Your myFunc should also be slightly updated to accommodate the changes made to createMut. Here's the revised version:

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This modification ensures that each mutation is posted correctly and allows you to handle errors gracefully.

Example

Putting everything together, your final code would look like this:

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Conclusion

By following the steps outlined above, you can successfully pass arrays to your GraphQL mutations using Axios. Remember that the primary change involves converting your array into a JSON string format before sending it. This adjustment not only resolves the issue of the function getting stuck but also enhances the overall reliability of your GraphQL requests.

With this knowledge in hand, you're now better equipped to handle complex data types when interacting with GraphQL. Happy coding!