How to rely on other middlewares in express?

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What is the best practice for relying on other middlewares in an express middleware? Let's say my middleware relies on having bodyParser before it executes. Is there a better way than telling my users explicitly in the readme to include and run my dependencies first?

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robertklep On BEST ANSWER

If your middleware requires body-parser and it would insert that middleware into the middleware chain itself, it may become problematic when the user is already including body-parser in their app (in other words, body-parser would be included twice).

It may work (never tried), but it may also cause unintended side effects, which is why I would document the requirement for body-parser but have the user install it themselves. Your middleware can explicitly throw an exception when it sees that req.body isn't defined for a request.