Parse application/x-www-form-urlencoded in Azure Function

August 22, 2020

For a Mailchimp webhook, I had to parse the application/x-www-form-urlencoded form data to JSON. Azure Functions does not automatically do this for you, so you have to provide your parser. I knew that I had already done this, so I went on a search journey through my code.

To make it easier next time, I wanted to share the code snippet with the rest of you. As you will notice, there isn’t a lot of code required.

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import { AzureFunction, Context, HttpRequest } from "@azure/functions";
import { parse, ParsedQs } from 'qs';

const httpTrigger: AzureFunction = async function (context: Context, req: HttpRequest): Promise<void> {
  if (req.rawBody) {
    const parsedData: ParsedQs = parse(req.rawBody);

    context.res = {
      body: parsedData
    };
  }

  context.res = {
    body: 'No raw body data'
  };
};

export default httpTrigger;

This code snippet makes use of the qs (querystring) dependency. To install this dependency to your project, all you need to do is: npm i qs -S -E.

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