errorface

☺ errorface

Express middleware for showing detailed error information when errors happen in your app.

Inspired by phperror.net.

Example

Visit the example error page to see it in action.

Installation

npm install errorface

Usage

var express = require("express"),
    errorface = require("errorface");

var app = express();

app.get("/", function(req, res, next) {
    res.send("Hello World");
});

app.get("/error", function(req, res, next) {
    app.doesntExist();
});

app.get("/*", function(req, res) {
    throw new Error("Not Found");
});

app.use(errorface.errorHandler());

app.listen(3000);

Advanced Usage

You can extend the middleware with a couple options, here are the defaults:

// Default options
var options = {
    // Output to console.log
    log: console.log,
    // We don't output errors to log unless you want to
    logErrors: false,
    // We return html response page if requested
    disableHtml: false,
    // We return json response if requested
    disableJson: false,
    // Pass a function (or a true/false value) to determine whether the error page should be shown
    showPage: function(err, req) {
        return true;
    },
    // We use Mustache to render templates by default
    templateFunc: Mustache.render,
    // You can pass a string in as a template
    errorPageTemplate: null,
    // Or, you can pass a path to a file to use as the template
    errorPageTemplatePath: __dirname + "/views/errorPage.stache",
    // If you want to twiddle with the data before it gets sent to the template
    preProcessTemplateData: function(data) { return data; }
};

// Just pass them to the errorHandler when you register with your express app
app.use(errorface.errorHandler(options));

Custom Templating

Here is an example of the data that gets sent to the template in case you want to create your own.

{
   "headLine":{
      "type":"description",
      "details":{
         "error":"Error",
         "message":"Not Found"
      }
   },
   "stack":[
      {
         "level":1,
         "trace":{
            "type":"file",
            "details":{
               "method":"init",
               "file":"''/projects/errorface/test/util/testServer.coffee",
               "fileHash":"2c57b3f110c76c5348e3e03296430f6b",
               "fileRelative":"/test/util/testServer.coffee",
               "line":18,
               "column":13
            }
         },
         "focused":"throw new Error(\"Not Found\");",
         "file":[
            {
               "num":14,
               "isFocus":false,
               "line":"    app.get(\"/error\", function(req, res, next) {"
            }
         ]
      }
   ],
   "lines":[
      {
         "type":"description",
         "details":{
            "error":"Error",
            "message":"Not Found"
         }
      },
      {
         "type":"file",
         "details":{
            "method":"init",
            "file":"''/projects/errorface/test/util/testServer.coffee",
            "fileHash":"2c57b3f110c76c5348e3e03296430f6b",
            "fileRelative":"/test/util/testServer.coffee",
            "line":18,
            "column":13
         }
      },
      {
         "type":"file",
         "details":{
            "method":"callbacks",
            "file":"''/projects/errorface/node_modules/express/lib/router/index.js",
            "fileHash":"ba7d97ee1f59f2aa0920257deb060e46",
            "fileRelative":"[module]/express/lib/router/index.js",
            "line":162,
            "column":11
         }
      }
   ],
   "projectDirectory":"''/projects/errorface"
}

License

Copyright 2012 Jacob Gable, MIT License; no attribution required.