158 lines
4.9 KiB
Markdown
158 lines
4.9 KiB
Markdown
# strong-error-handler
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Error handler for use in development (debug) and production environments.
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## Production mode
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- error responses are purposely left without detail in order to prevent leaking sensitive information.
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- For 5xx errors, the output contains only the status code and the status name from the HTTP specification.
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- For 4xx errors, the output contains the full error message (`error.message`) and the contents of the `details`
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property (`error.details`). The latter is typically used by `ValidationError` to provide machine-readable details
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about the validation problems.
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## Debug Mode
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- Full error stack traces and internal details of any object passed passed as the error will be sent back to the client
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in the HTTP responses when an error occurs.
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## Response Format
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- `strong-error-handler` currently supports HTML and JSON responses.
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- When the object is a standard Error object, the string provided by the stack property will be returned in HTML/text
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responses.
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- When the object is a non-Error object, the result of `util.inspect` will be returned in HTML/text responses.
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- For JSON responses, the result will be an object with all enumerable properties from the object in the response.
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## Install
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```bash
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$ npm install strong-error-handler
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```
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## Usage
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In an express-based application:
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```js
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var express = require('express');
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var errorHandler = require('strong-error-handler');
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var app = express();
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// setup your routes
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// `options` are set to default values. For more info, see `options` below.
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// app.use(errorHandler({ /* options, see below */ }));
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app.use(errorHandler({debug:true, log:true}));
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app.listen(3000);
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```
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In LoopBack applications, add the following entry to your
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`server/middleware.json` file.
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```json
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{
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"final:after": {
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"strong-error-handler": {
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"params": {
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}
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}
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}
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}
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```
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## Content Type
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Depending on the request header's `Accepts`, response will be returned in
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the corresponding content-type, current supported types include:
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- JSON (`json`/`application/json`)
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- HTML (`html`/`text/html`)
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*There are plans to support other formats such as Text and XML.*
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## Options
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#### debug
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`boolean`, defaults to `false`.
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If you need to set the environment to development mode, you will need to change the value to `true`.
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When enabled, HTTP responses include all error properties, including
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sensitive data such as file paths, URLs and stack traces. *See Examples below*
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#### log
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`boolean`, defaults to `true`.
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When enabled, all errors are printed via `console.error`. That includes an array of fields (custom error properties)
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that are safe to include in response messages (both 4xx and 5xx).
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When not enabled, it only sends the error back in the response.
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Customization of the log format is intentionally not allowed. If you would like
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to use a different format/logger, disable this option and add your own custom
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error-handling middleware.
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```js
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app.use(myErrorLogger());
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app.use(errorHandler({ log: false }));
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```
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## Migration to strong-error-handler for existing LoopBack applications
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1. In package.json dependencies, remove ` "errorhandler": "^x.x.x”,`
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1. Run `npm install --save strong-error-handler`
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1. In `./server/config.json`, remove:
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```
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"errorHandler": {
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"disableStackTrace": false
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}
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```
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and replace it with `"handleErrors": false`.
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1. In `server/middleware.json`, remove
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```
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"final:after": {
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"loopback#errorHandler": {}
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}
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```
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and replace it with:
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```
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"final:after": {
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"strong-error-handler": {}
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}
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```
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1. In the `./server`, delete `middleware.production.json`.
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1. In the `./server`, create `middleware.development.json` containing:
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```JSON
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{
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"final:after": {
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"strong-error-handler": {
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"params": {
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"debug": true,
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"log": true
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}
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}
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}
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}
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```
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## Examples:
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Error generated when `debug: false` :
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```
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{ error: { statusCode: 500, message: 'Internal Server Error' } }
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```
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Error generated when `debug: true` :
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```
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{ error:
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{ statusCode: 500,
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name: 'Error',
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message: 'a test error message',
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stack: 'Error: a test error message\n at Context.<anonymous> (User/strong-error-handler/test/handler.test.js:220:21)\n at callFnAsync (User/strong-error-handler/node_modules/mocha/lib/runnable.js:349:8)\n at Test.Runnable.run (User/strong-error-handler/node_modules/mocha/lib/runnable.js:301:7)\n at Runner.runTest (User/strong-error-handler/node_modules/mocha/lib/runner.js:422:10)\n at User/strong-error-handler/node_modules/mocha/lib/runner.js:528:12\n at next (User/strong-error-handler/node_modules/mocha/lib/runner.js:342:14)\n at User/strong-error-handler/node_modules/mocha/lib/runner.js:352:7\n at next (User/strong-error-handler/node_modules/mocha/lib/runner.js:284:14)\n at Immediate._onImmediate (User/strong-error-handler/node_modules/mocha/lib/runner.js:320:5)\n at tryOnImmediate (timers.js:543:15)\n at processImmediate [as _immediateCallback] (timers.js:523:5)' }}
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```
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