Playing out the REST endpoint in ExpressJS simulation

Suppose I have set up the following endpoints in my ExpressJS configuration file server.js:

// Generic    
app.post('/mycontext/:_version/:_controller/:_file', (req, res) => {
      const {_version,_controller,_file} = req.params;
      const mockDataFile = path.normalize(path.join(mockRoot,`${_version}/${_controller}/${_file}.json`));
    });

// Specific    
    app.post('/mycontext/v1/mycontroller/myendpoint', (req, res) => {
    
    });

If an endpoint is called from the UI as /mycontext/v1/mycontroller/myendpoint, which of these configurations will be used? Does the order in which these configurations are defined make a difference?

Answer №1

Priority is given to the first request received.

ExpressJS determines route priority based on path specificity and declaration order. Routes are prioritized from most specific to least specific.

The initial route that matches will be executed:

app.post('/mycontext/:_version/:_controller/:_file', (req, res) => {
      const {_version,_controller,_file} = req.params;
      const mockDataFile = path.normalize(path.join(mockRoot,`${_version}/${_controller}/${_file}.json`));
    });

Keep in mind that ExpressJS does not offer a built-in way to organize routes by priority.

However, it is recommended to place specific routes before generic routes.

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