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PRINCIPAL ACCOUNTING POLICIES - Schedule of estimated useful lives (Details)	12 Months Ended
	Dec. 31, 2021
Leasehold improvement
Property, Plant and Equipment, Estimated Useful Lives	Shorter of the term of the lease or the estimated useful lives of the assets
Electronic equipment
Property, Plant and Equipment, Estimated Useful Lives	3 years
Furniture
Property, Plant and Equipment, Estimated Useful Lives	3 years
Software
Property, Plant and Equipment, Estimated Useful Lives	3 years
Vehicles
Property, Plant and Equipment, Estimated Useful Lives	3 years

X

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123364984&loc=d3e1205-110223

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=yj_ElectronicEquipmentMember
Namespace Prefix:
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Period Type:

X

- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareDevelopmentMember
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: