How to POST Files and JSON in a Single Request with Axios

Learn how to efficiently send both file uploads and JSON data to an API in a single `POST` request using Axios in your React applications.
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How to POST Files and JSON in a Single Request with Axios

In modern web applications, it often becomes necessary to send both files and JSON data to an API in a single request. If you're working with React and Axios, you might find this challenging at first. This guide will help you understand how to merge file uploads with JSON data in a seamless manner using Axios.

Understanding the Problem

You might have encountered a requirement where you need to submit multiple files alongside some JSON data for your application to function correctly. The confusion might stem from how to format and send these items correctly to your API endpoint. In this instance, our goal is to post three files along with some JSON data to a server.

Step-by-Step Solution

Here is how you can achieve this using Axios by sending a POST request that includes both files and JSON data. Below I'll break this down into clear sections for better comprehension.

1. Creating FormData Object

The first step is to create an instance of FormData, which allows us to construct key/value pairs for form submissions, including files and other data.

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2. Encoding JSON Data

Next, you need to encode your JSON data so that it can be included in the URL of the request. You can use encodeURIComponent to ensure that the JSON string is safely transmitted.

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3. Making the Axios POST Request

Now that you have both the FormData and the JSON data prepared, you can send a POST request to your API endpoint. The crucial part here is to append the JSON data as a query parameter.

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4. Handling the Response

Once you make the POST request, you might want to handle the response to confirm that your data is sent successfully. Here’s how you can log the response or handle any errors:

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Complete Code Example

Here is how the complete code for your posting function might look like:

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Conclusion

Integrating file uploads and JSON data in a single Axios POST request can simplify the way your application interacts with back-end services. By following the steps outlined in this post, you should now be able to send multiple files along with JSON in a single request effortlessly.

Feel free to reach out if you need further assistance or have additional queries regarding Axios or API requests!