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This article mainly introduces nodejs how to develop a Wechat chat robot, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The data flow chart for this approach is as follows:

The user sends messages to the official account within the official account.

After receiving the message sent by the user, the Wechat server sends the message to the developer server through the interface provided by the developer.

After the developer server receives the message and carries out the relevant business processing, it returns the processing result to the Wechat server

The Wechat server then displays the content returned by the developer server to the user in the form of a message.

After understanding the principle, we began to work. In this case, we take the test number as an example.

Step 1: build a local service with express, and set up two interfaces to verify the interface configuration information and receive the user information forwarded by the Wechat server. The core code of the API is as follows:

You can see that the interface paths are all "/", but the request methods are different. The request parameters are printed separately without response processing, which will be set later.

In order to facilitate memory, the interface requested by get is named interface 1, and the interface requested by post is named interface 2.

Interface 2 can only use data events and end events to obtain request data because it wants to receive data in xml format.

Step 2: expose the local express service to the public network through ngrok. Refer to this article to share an intranet penetration tool, ngrok.

Step 3: open the test number API configuration information page, as shown in the figure:

The print result is as follows:

You can see that we have obtained the request parameters, as required by the official documentation: configure the API and return echostr to indicate that the API is called. And we are just doing a test here, omitting the process of encryption and decryption, and changing API 1 to the following code:

Relative to the initial setting, the code just adds a response, restarts the local service, and clicks the submit button again. The correct result is as follows:

Step 4: use your mobile phone to send a message to the test official account to view the print data of API 2, as shown in the figure:

You can see that the data received here is in xml format and has been printed three times in a row. Note here that because route 2 in our code does not respond to any information after receiving the data, Wechat will continue to send the same request after five seconds, for a total of three times. Only after the API returns information, the Wechat server will not repeat the message.

To get back to the point, we need to convert the data in xml format into js objects. Here we need to use a npm package called xml2js. It is very simple to check the official documents. The code to integrate xml2js into the project is as follows:

At this time, use the mobile phone to send a message to the test official account, and the printed result is:

After getting the data in the format of js object, we can set the return information according to the specific data information. But the returned data is also converted to xml format, and another method of xml2js is used here. A complete No.2 interface. The code for receiving request-response data is as follows:

At this point, send a message to the Wechat test account to see if there is a response.

Thank you for reading this article carefully. I hope the article "how to develop a Wechat chat Robot by nodejs" shared by the editor will be helpful to everyone. At the same time, I also hope that you will support and follow the industry information channel. More related knowledge is waiting for you to learn!

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