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DEFERRED REVENUE - Schedule of deferred revenue (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Deferred revenue	¥ 105,752	$ 16,595	¥ 50,951
Deferred merchandise revenue [Member]
Deferred revenue	99,213		40,645
Deferred membership program revenue [Member]
Deferred revenue	1,025		0
Deferred marketplace revenue [Member]
Deferred revenue	4,402		9,113
Deferred other revenue [Member]
Deferred revenue	¥ 1,112		¥ 1,193

X

- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DeferredRevenueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_ProductOrServiceAxis=yj_MerchandiseRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=yj_ProgramRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=yj_DeferredMarketPlaceRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=yj_DeferredOtherRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: