Schedule of changes in liabilities from financing activities (Details) - USD ($)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
IfrsStatementLineItems [Line Items]
Net cash flow from financing activities	$ 1,410,473	$ (780,437)
Effect of foreign exchange rate changes	(5,357)	423,994
Short-term borrowings [member]
IfrsStatementLineItems [Line Items]
January 1	6,964,927	6,328,892
Net cash flow from financing activities	2,034,824
Proceeds from long-term loans		636,035
Payments on long-term loans
Effect of foreign exchange rate changes
Changes from other activities
December 31	8,999,751	6,964,927
Exchange adjustment
Long-term borrowings [member]
IfrsStatementLineItems [Line Items]
January 1	980,200	1,223,636
Net cash flow from financing activities		(176,487)
Proceeds from long-term loans	482,284
Payments on long-term loans	(421,063)	642,467
Effect of foreign exchange rate changes	(3,653)
Changes from other activities		(709,416)
December 31	1,037,768	980,200
Exchange adjustment
Lease liabilities [member]
IfrsStatementLineItems [Line Items]
January 1	105,745	4,491,496
Net cash flow from financing activities	(205,321)	(4,261,578)
Proceeds from long-term loans		(206,147)
Payments on long-term loans
Effect of foreign exchange rate changes	(26,426)
Changes from other activities	289,777
December 31	163,775	105,745
Exchange adjustment		81,974
Total Liabilities From Financing Activities [member]
IfrsStatementLineItems [Line Items]
January 1	8,050,872	12,044,024
Net cash flow from financing activities	1,829,503	(4,438,065)
Proceeds from long-term loans	482,284	429,888
Payments on long-term loans	(421,063)	642,467
Effect of foreign exchange rate changes	(31,229)
Changes from other activities	290,927	(709,416)
December 31	$ 10,201,294	8,050,872
Exchange adjustment		$ 81,974

Effect of foreign exchange rate changes.

No definition available.

Name:	YMAT_EffectOfForeignExchangeRateChanges
Namespace Prefix:	YMAT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Exchange adjustment.

+ References

No definition available.

+ Details

Name:	YMAT_ExchangeAdjustment
Namespace Prefix:	YMAT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	YMAT_IfrsStatementLineItems
Namespace Prefix:	YMAT_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Payments on long-term loans.

+ References

No definition available.

+ Details

Name:	YMAT_PaymentsOnLongtermLoans
Namespace Prefix:	YMAT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Proceeds from long-term loans.

+ References

No definition available.

+ Details

Name:	YMAT_ProceedsFromLongtermLoans
Namespace Prefix:	YMAT_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity, from continuing and discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 10
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_10&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 50
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_50_d&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_CashFlowsFromUsedInFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 44B
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_44B_e&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 44D
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_44D&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_LiabilitiesArisingFromFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis=ifrs-full_ShorttermBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis=ifrs-full_LongtermBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis=ifrs-full_LeaseLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis=YMAT_TotalLiabilitiesFromFinancingActivitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: