TypeError: Cannot read property 'createPattern' of null

[gauravsheel]

Apologies if I have overlooked something or this has been discussed before.

The async patterns.createPattern method returns exception. Node version used is 8.9.0 (including other versions on runKit). The code sample on github/memz page doesn't work for me as well.

Example code run :

`// define grok pattern string
var p = '%{IP:client} \[%{TIMESTAMP_ISO8601:timestamp}\] "%{WORD:method} %{URIHOST:site}%{URIPATHPARAM:url}" %{INT:code} %{INT:request} %{INT:response} - %{NUMBER:took} \[%{DATA:cache}\] "%{DATA:mtag}" "%{DATA:agent}"';
// define test input string
var str = '203.35.135.165 [2016-03-15T12:42:04+11:00] "GET memz.co/cloud/" 304 962 0 - 0.003 [MISS] "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36"';

// asynchronously load default grop patterns
require('node-grok').loadDefault(function (patterns) {
// create new anonymous grok pattern
var pattern = patterns.createPattern(p);
// parse test string
pattern.parse(str, function (err, obj) {
// output result object
console.log(obj);
});
});`

## error returned --
var pattern = patterns.createPattern(p);
^

TypeError: Cannot read property 'createPattern' of null
at /Users/gauravsheel/workfiles/web-work/tools/ngrok/tmp.js:9:28
at /Users/gauravsheel/workfiles/web-work/tools/ngrok/node_modules/node-grok/lib/index.js:232:24
at /Users/gauravsheel/workfiles/web-work/tools/ngrok/node_modules/async/lib/async.js:726:13
at /Users/gauravsheel/workfiles/web-work/tools/ngrok/node_modules/async/lib/async.js:52:16
at done (/Users/gauravsheel/workfiles/web-work/tools/ngrok/node_modules/async/lib/async.js:246:17)
at /Users/gauravsheel/workfiles/web-work/tools/ngrok/node_modules/async/lib/async.js:44:16
at /Users/gauravsheel/workfiles/web-work/tools/ngrok/node_modules/async/lib/async.js:723:17
at /Users/gauravsheel/workfiles/web-work/tools/ngrok/node_modules/async/lib/async.js:167:37
at /Users/gauravsheel/workfiles/web-work/tools/ngrok/node_modules/node-grok/lib/index.js:183:20
at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:511:3)

[juansmartenit]

Same issue here

[horacimacias]

the callback specified in the readme is missing the error parameter.
The API description is correct (Callback receives patterns collection filled in with default templates: function(err, patterns)) but the sample code is not right as it's missing the error argument.

I had the same issue, just run the code as follows:

require('node-grok').loadDefault(function (err, patterns) {
console.log('patterns is ', patterns);
var pattern = patterns.createPattern(p);
pattern.parse(str, function (err, obj) {
console.log(obj);
});
});