Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 10, 2022	Jun. 30, 2021
Document Information Line Items
Entity Registrant Name	JASPER THERAPEUTICS, INC.
Trading Symbol	JSPR
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Public Float			$ 99,400,000
Amendment Flag	false
Entity Central Index Key	0001788028
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Shell Company	false
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-39138
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-2984849
Entity Address, Address Line One	2200 Bridge Pkwy
Entity Address, Address Line Two	Suite #102
Entity Address, City or Town	Redwood City
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94065
City Area Code	(650)
Local Phone Number	549-1400
Title of 12(b) Security	Voting Common Stock, par value $0.0001 per share
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	San Jose, California
Voting Common Stock
Document Information Line Items
Entity Common Stock, Shares Outstanding		36,577,576
Non-Voting Common Stock
Document Information Line Items
Entity Common Stock, Shares Outstanding		1,296,022