How to Pass Form Data with Axios: Should I Set _boundary Manually?

Passing Data to Axios Service

In this scenario, the objective is to pass form data from the loginService component to the Services/index component to access _boundary in the Axios instance's headers. The key to achieving this lies in understanding how request bodies are handled by HTTP clients.

HTTP Request Body Handling

When making HTTP requests with FormData, the client automatically sets the Content-Type header to multipart/form-data and includes the appropriate boundary tokens. Similarly, for URLSearchParams, it sets Content-Type to application/x-www-form-urlencoded.

Fixing the Axios Issue

In your case, you want to set _boundary in the header manually. However, since we are already using FormData, the runtime will handle this automatically. You can skip this step if using Axios v0.27.1 or earlier.

Node.js Considerations

When using Axios in Node.js, FormData headers will not be inferred automatically. As a workaround, you can use a request interceptor:

<code class="javascript">axios.interceptors.request.use(config => {
  if (config.data instanceof FormData) {
    Object.assign(config.headers, config.data.getHeaders());
  }
  return config;
}, null, { synchronous: true });</code>

Alternatively, merge the headers manually while making the request.

jQuery Considerations

If using jQuery's $.ajax() or convenience methods like $.post(), it's important to set contentType and processData to false to prevent automatic serialization and preserve the FormData format:

<code class="javascript">$.ajax({
  url,
  method: "POST",
  data: body,
  contentType: false,
  processData: false
})</code>

Avoid Axios Versions 0.27.1 and 1.0.0

These specific versions of Axios have known issues handling FormData. We recommend using Fetch, got, or ky instead.

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