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About​

LanguageTool’s multilingual grammar, style, and spell checker is used by millions of people around the world

Security​

By default, the app's API is public. To avoid misuse, change the URL to include a secret. To do so:

  • Edit /app/data/env using the File manager

  • Change API_PATH_PREFIX to some secret. You can generate a secret using pwgen -1s 6 .

  • Restart the app.

In the apps, use https://languagetool.domain.com/<secret>/v2 as the URL instead of the default https://languagetool.domain.com/v2.

To test, if hushhush is the secret:

Bash
curl -d "text=Hello world" -d "language=de-DE" https://languagetool.domain.com/hushhush/v2/check
Use alphanumerals for the secret

The secret is part of the URL. For this reason, keep it simple and use only alphanumerals for the secret.

N-grams​

LanguageTool can optionally make use of large n-gram data sets to detect errors with words that are often confused, like their and there.

The n-gram data set is huge and thus not part of the LT download. The install path is the first argument for the download command below. The default is /app/data/ngrams but you can use e.g. a volume path if you don't want ngrams to be part of your backup.

To download the n-gram data set of a language:

  • Open a Web Terminal and run the command below. Replace the argument /app/data/ngrams with your desired path (e.g. a volume) if you don't want ngrams to be part of your backup .
Bash
/app/pkg/install-ngrams.sh /app/data/ngrams en es
Example output
==> Installing en ngram dataset from https://languagetool.org/download/ngram-data/ngrams-en-20150817.zip
/tmp/en.zip 100%[================================================================>]   8.35G   112MB/s    in 77s     
==> Unpacking en ngram dataset
Archive:  /tmp/en.zip
   creating: en/
   creating: en/3grams/
  inflating: en/3grams/_1e4.fdt      
  inflating: en/3grams/_1e4.si       
 extracting: en/3grams/_1e4.nvd      

...

  inflating: en/1grams/_1p.si        
==> en ngram dataset has been installed.
==> Done


Set NGRAM_DATASET_PATH=/app/data/ngrams in /app/data/env and restart the app.

  • Open /app/data/env using the file manager and check that NGRAM_DATASET_PATH is set to the correct path.

  • Restart the app.

Large data set

n-gram data sets are large. For example, the en is around 14GB and de is 3GB.