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v3.26.1

Schedule of service revenue (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
IfrsStatementLineItems [Line Items] |  |  |
Total Service revenue | $ 960,000 | $ 529,665 | $ 325,370
YMA DG [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Total Service revenue | 960,000 | 529,665 | 280,231
Forwell [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Total Service revenue |  |  | $ 45,139

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- References No definition available. + Details
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Namespace Prefix: | YMAT_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Service revenue. + References No definition available. + Details
Name: | YMAT_ServiceRevenue
Namespace Prefix: | YMAT_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=YMAT_YMADGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=YMAT_ForwellMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |