Default message error > change language

[matthieuowlie]

Describe the bug
I wanted my API to send default error messages in french on auth login when the user, associated with identifier and password sent, is not found or blocked.

After having strapi configured (https://strapi.io/documentation/3.0.0-alpha.x/configurations/configurations.html#language) is doesn't worked.

Steps to reproduce the behavior

1. Go to ./config/language.json.
2. Change the language.json defaultLocale with 'fr'
3. Call the API with a POST request on URL "localhost:1337/auth/local" with identifier and password in body.
4. Get the error message in english

Expected behavior
The error message should be in the locale language parameter in ./config/language.json

Screenshots

System

• Node.js version: v10.16.3
• NPM version: 6.9.0
• Strapi version: 3.0.0-beta.16.5
• Database: sqlite3 in .tmp/data.db
• Operating system: Windows 10

[lauriejim]

Hello @matthieuowlie !

The API response messages are only in en.
You will not be able to modify them.

I suggest you manage the translation in your front end application.

The configuration you updated is for the backend i18n feature.
That lets you create your translation in ./config/locals folder.
And use it via the koa-i18n middleware.

In the next version of strapi we will remove it.
If you want to use this feature, you will have to manually install it.

[matthieuowlie]

Hello @lauriejim ,

thanks for answering my question.

As Strapi does not translate automatically in different languages, is there any way to know what kind of errors Strapi returns ?

In almost all cases, there is a code statusCode 400 with an error 'Bad Request' and only the message sent makes me available to know why it has failed (user has not confirmed his e-mail, user is blocked ...).

But i think doing translation based on a message is not a good practice since the message will maybe change in the future. It would be more efficient to add a code error like "auth/user-not-confirm" "auth/user-blocked"

This way, even if the default message changes, i can trigger a translation or a function depending of the code error returned.

What do you think about at ?

[lauriejim]

I agree about the translation based on another translation sentence.
About this thing, we will update to base translation on the error code name (like you said).

To know all auth errors, you can check errors on this files Auth Controller
Check each formatError function to see messages.

[matthieuowlie]

Hello @lauriejim ,

thanks for sharing all these messages.
From what i saw, maybe you could send the ID of each messages ?

For example, for a user blocked, you send this:
return ctx.badRequest( null, formatError({ id: 'Auth.form.error.blocked', message: 'Your account has been blocked by an administrator', }) );

Maybe you could send both id and message ? This way i can translate from the id "Auth.form.error.invalid" if necessary or print the default message if not necessary !

[lauriejim]

Thank you for this feedback.

[kuriel-trivu]

Strapi should return translated messages as @matthieuowlie described. Since the goal of Strapi is to build API with no effort.

[rodrigosebastiao]

I did a good effort to extract the error message beyond the "400 Bad Request".
In a
.catch(e){ e.networkError.result.errors[0].extensions.data[0].messages[0].message : e.graphQLErrors; }
I am using react, I also could get from props
this.props.error.result.errors[0].extensions.data[0].messages[0].message : e.graphQLErrors;

A safier way is to traverse the object

`let messageText = findErrorKey(e, "messages");

function findErrorKey(jsonObj, target) {
let level = 0;
let response;

function traverse(jsonObj) {
    if(level > 100){ console.log("traverse stack limit", 100); return; }
    level++;

    if( jsonObj !== null && typeof jsonObj == "object" ) {
        Object.entries(jsonObj).forEach(([key, value]) => {
            // key is either an array index or object key
            if(key === target){
                response = value[0].message;
                return response;
            }
            traverse(value);
        });
    }
    else {
        // jsonObj is a number or string
        // console.log("jsonObj", jsonObj);
    }
}
traverse(jsonObj);
return response;

}`

I'd love to know the correct way to forward and get error message in a non-admin frontend and to switch those erros from english to another language, once the translation is already in strapi, but can't switch.

[ako-v]

adding ids to the error messages seems to be a need for correct translations, translating errors in the front-end is not a good idea.
I can help with adding ids to the error messages.

[strapi-bot]

This issue has been mentioned on Strapi Community Forum. There might be relevant details there:

https://forum.strapi.io/t/is-it-possible-to-translate-standard-error-messages/31731/2

[ldiellyoungl]

Is there any progress?