Income tax holiday exemption period.

No definition available.

Name:	jfin_IncomeTaxHolidayExemptionPeriod
Namespace Prefix:	jfin_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Extension period for statute of limitations under special circumstances, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	jfin_IncomeTaxStatuteOfLimitationsExtensionPeriodUnderSpecialCircumstances
Namespace Prefix:	jfin_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period for statute of limitations, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	jfin_IncomeTaxStatuteOfLimitationsPeriod
Namespace Prefix:	jfin_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period for statute of limitations under related party transaction, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	jfin_IncomeTaxStatuteOfLimitationsRelatedPartyTransactionPeriod
Namespace Prefix:	jfin_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of underpayment of tax liability specified under special circumstances.

+ References

No definition available.

+ Details

Name:	jfin_IncomeTaxUnderpaymentOfTaxLiabilityListedInSpecialCircumstances
Namespace Prefix:	jfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Income Taxes.

+ References

No definition available.

+ Details

Name:	jfin_IncomeTaxesLineItems
Namespace Prefix:	jfin_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of CIT rate.

+ References

No definition available.

+ Details

Name:	jfin_PercentageOfCITRate
Namespace Prefix:	jfin_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Corporate Income Tax adjust.

+ References

No definition available.

+ Details

Name:	jfin_PercentageOfCorporateIncomeTaxAdjust
Namespace Prefix:	jfin_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Preferential tax rate.

+ References

No definition available.

+ Details

Name:	jfin_PreferentialTaxRate
Namespace Prefix:	jfin_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Tax With holding Rate For Foreign Invested Enterprise To Foreign Investors That Are Non Resident Enterprises.

+ References

No definition available.

+ Details

Name:	jfin_TaxWithHoldingRateForForeignInvestedEnterpriseToForeignInvestorsThatAreNonResidentEnterprises
Namespace Prefix:	jfin_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold Beneficial Owner Percentage Determining Withholding Income Tax Rate.

+ References

No definition available.

+ Details

Name:	jfin_ThresholdBeneficialOwnerPercentageDeterminingWithholdingIncomeTaxRate
Namespace Prefix:	jfin_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Withholding Income Tax Rate On Dividends Paid Out If Investor Qualifies As Beneficial Owner With Holdings Above Threshold Percentage.

+ References

No definition available.

+ Details

Name:	jfin_WithholdingIncomeTaxRateOnDividendsPaidOutIfInvestorQualifiesAsBeneficialOwnerWithHoldingsAboveThresholdPercentage
Namespace Prefix:	jfin_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Withhold income tax rate on dividends paid-out to foreign entities if investors qualifies as beneficial owner with holdings below the threshold percentage.

+ References

No definition available.

+ Details

Name:	jfin_WithholdingIncomeTaxRateOnDividendsPaidOutIfInvestorQualifiesAsBeneficialOwnerWithholdingsBelowThresholdPercentage
Namespace Prefix:	jfin_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

+ Details

Name:	us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because of a tax holiday.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

+ Details

Name:	us-gaap_EffectiveIncomeTaxRateReconciliationTaxHolidays
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because of a tax holiday.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

+ Details

Name:	us-gaap_IncomeTaxReconciliationTaxHolidays
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

+ Details

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_OperatingLossCarryforwardsExpirationDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

A description of the limitations on the use of all operating loss carryforwards available to reduce future taxable income.

+ References

No definition available.

+ Details

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

- Details

Name:	dei_LegalEntityAxis=jfin_ShanghaiChuangzhenSoftwareCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAdministrationOfTaxationChinaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_HK
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_MX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_ID
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

INCOME TAXES - Additional Information (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018
Income Taxes [Line Items]
Income tax rate			25.00%	25.00%	25.00%
Income tax reconciliation percentage of tax holiday exemption			2.12%	18.86%	12.87%
Valuation allowances			¥ 4,102	¥ 1,909
Tax loss carry-forward			¥ 55,222
Tax loss carry-forward, expiration date			Dec. 31, 2025	Dec. 31, 2023
Tax loss carry-forward, limitations on use			The Company operates its business through its subsidiaries and VIEs. The Company does not file consolidated tax returns, therefore, losses from individual subsidiaries or the VIEs may not be used to offset other subsidiaries’ or VIEs’ earnings within the Company.
Foreign investment enterprises, withholding income tax rate			10.00%
Foreign investment enterprises, withholding income tax rate for those who qualifies as a beneficial owner			5.00%
Foreign investment enterprises, threshold of beneficial ownership to qualify for reduction in withholding income tax rate			25.00%
Foreign investment enterprises, withholding income tax rate for those who do not qualify as a beneficial owner			10.00%
Shanghai Chuangzhen Software Co., Ltd.
Income Taxes [Line Items]
Income tax reconciliation tax holiday exemption amount			¥ 0
Income tax holiday exemption period			3 years
Income tax reconciliation percentage of tax holiday exemption			50.00%
Forecast [Member] \| Shanghai Chuangzhen Software Co., Ltd.
Income Taxes [Line Items]
Income tax reconciliation tax holiday exemption amount		¥ 0
Income tax holiday exemption period		3 years
Income tax reconciliation percentage of tax holiday exemption		50.00%
Hong Kong
Income Taxes [Line Items]
Income tax rate			25.00%
Preferential tax rate			15.00%
Statute of limitations period (in years)			3 years
Extension period for statute of limitations under special circumstances (in years)			5 years
Amount of underpayment threshold of tax liability listed as special circumstance			¥ 100
Statute of limitations period for related party transaction (in years)			10 years
Hong Kong
Income Taxes [Line Items]
Income tax rate			16.50%
Mexico
Income Taxes [Line Items]
Income tax rate			30.00%
Indonesia
Income Taxes [Line Items]
Percentage of CIT rate			25
Percentage of Corporate Income Tax adjust			22
Indonesia \| Forecast [Member]
Income Taxes [Line Items]
Percentage of Corporate Income Tax adjust	20	22