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Cover
 12 Months Ended
Dec. 31, 2024
Entity Addresses [Line Items]  
Document Type F-1/A
Amendment Flag true
Amendment Description Amendment No. 1
Entity Registrant Name J-Star Holding Co., Ltd.
Entity Central Index Key 0001875016
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One 7/F-1, No. 633, Sec. 2
Entity Address, Address Line Two Taiwan Blvd.
Entity Address, Address Line Three Xitun District
Entity Address, City or Town Taichung City
Entity Address, Country TW
Entity Address, Postal Zip Code 407
City Area Code 886
Local Phone Number 423229900
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One 850 Library Avenue
Entity Address, Address Line Two Suite 204
Entity Address, City or Town Newark
Entity Address, State or Province DE
Entity Address, Postal Zip Code 19711
City Area Code (302)
Local Phone Number 738-6680
Contact Personnel Name Puglisi & Associates