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CONCENTRATION AND RISKS - Additional Information (Details)	1 Months Ended	12 Months Ended
	Jul. 31, 2015	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) In Foreign Currency Exchange Rate	20.00%	2.30%	6.50%	(1.60%)

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- Definition

Percentage Of Increase (Decrease) In Foreign Currency Exchange Rate, Translation.

+ References

No definition available.

+ Details

Name:	yj_PercentageOfIncreasedecreaseInForeignCurrencyExchangeRateTranslation
Namespace Prefix:	yj_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration