Add comprehensive middleware execution order and error handling examples #6924
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krzysdz
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krzysdz
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This PR introduces a detailed Middleware Guide and corresponding interactive examples
I can only see a single example. There are guides related to middleware on the Express.js website (expressjs/expressjs.com), but I don't see any PRs from you there. Did you forget to add something here or open a PR in the website repo?
- Side-by-side comparisons of correct vs incorrect patterns
I can't see this anywhere either.
| "encodeurl": "^2.0.0", | ||
| "escape-html": "^1.0.3", | ||
| "etag": "^1.8.1", | ||
| "express": "^5.1.0", |
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Why should express have itself as a dependency?
| function userHandler(req, res, next) { | ||
| console.log('3. Route Handler: Executing'); | ||
| res.send(`User ID: ${req.params.id}, Requested at: ${req.requestTime}`); | ||
| console.log('3. Route Handler: Finished (response sent)'); | ||
| // Note: We don't call next() here because we sent a response. | ||
| } |
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If you are not using next() it can be omitted from the function signature. The only case when Express cares about the number of arguments in function signature is error handlers (must have exactly 4).
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PR: Comprehensive Middleware Guide and Deep Dive Examples
#Overview
This PR introduces a detailed Middleware Guide and corresponding interactive examples for Express.js. It provides developers with a deeper understanding of middleware execution order, error handling, async patterns, and best practices, addressing gaps in existing documentation.
New Files Created
1.examples/middleware-deep-dive/index.js`** – Interactive example demonstrating:
This PR enhances Express.js documentation by providing a comprehensive middleware guide with interactive examples, covering execution order, error handling, and async patterns. It directly addresses developer pain points and improves learning resources.
Fixes: #6923