I have created a contract using solidity which has a comment field. I want to provide multi language support so that user can insert and retrieve comment in any language.

Please suggest how we can achieve this feature?

  • 1
    Can you please post more details? Oct 25, 2017 at 6:53
  • I want to insert and retrieve Chinese language.
    – vaibhav
    Oct 25, 2017 at 8:11

1 Answer 1


Instead of using just a single string to store the comment, you will have to use an array, struct or mapping to store all the translations. For example, you could create a mapping of two-letter language codes to the versions of the comment in that language:

mapping (bytes2 => string) languageCodeToComment;

Now, you can add a comment in multiple langauges:

languageCodeToComment["EN"] = "This is the English comment!";

languageCodeToComment["NL"] = "Dit is het Nederlandse bericht!";

languageCodeToComment["FY"] = "Dit is yn it Frysk!";

  • Thanks Jesse, How to insert and get comment in Chinese language?
    – vaibhav
    Oct 25, 2017 at 8:09
  • @vaibhav You can use the same technique: languageCodeToComment["ZH"] = "漢字";
    – Jesbus
    Oct 25, 2017 at 8:55
  • I understand it. but when i fetch Chinese value, it returns hexa value. how to convert hexa to chinese ?
    – vaibhav
    Oct 25, 2017 at 10:36
  • @vaibhav Can you paste here what it returns? I hadn't tested non-ASCII characters before, but it seems to work fine. Check out this test contract I just deployed: etherscan.io/address/…
    – Jesbus
    Oct 25, 2017 at 11:15
  • @vaibhav Read this ethereum.stackexchange.com/questions/28344/…, solidity stores strings as sequence of bytes. They suggest converting your string to utf-8 encoding before storing, and decoding from utf-8 to your string type. For example javascript strings are utf-16 so you have to convert to utf-8 before storing them.
    – Ismael
    Oct 26, 2017 at 5:52

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