CODEWITHSUNDEEP
javascriptexpressexpress-validator
Glenn
Glenn

Reputation: 5081

How to pass req.params as an an argument to a middleware function?

I'm trying to figure out a way to use req.params as an argument in my middleware. Take this (obviously broken) code for example:

router.post('/:myParam', checkSchema(schemas[req.params.myParam]), async (req, res, next) => {
  // do stuff
})

The goal here is that I am using express-validator and I load a dynamic schema based on what param is passed. The above code is obviously broken because I don't yet have the scope to access the req variable, I'm just trying to illustrate what I'm trying to accomplish.

Upvotes: 0

Views: 392

Answers (2)

Hakim Bencella
Hakim Bencella

Reputation: 326

You can directly call schemas(req.params.myParam) inside the checkSchema middleware since the middleware will have access to the request object.

Upvotes: 1

Missoum Said
Missoum Said

Reputation: 36

if you know the possible params ahead, you could do something like the following:

router.post("/:myParam", checkSchema("soccer"), async (req, res, next) => {});

//checkSchema.JS
    const soccerSchema = require("../schemas/soccerSchema");
    const swimmingSchema = require("../schemas/swimmingSchema");

    module.exports = function (schemaName) {
      return (req, res, next) => {
        const schemas = { soccer: soccerSchema, swimming: swimmingSchema };
        //You can access it here schemas[schemaName]
        console.log(schemas[schemaName]);
        next();
      };
    };

Upvotes: 1

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