| Cover | Nov. 17, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 17, 2023 |
| Entity File Number | 001-41748 |
| Entity Registrant Name | JANOVER INC. |
| Entity Central Index Key | 0001805526 |
| Entity Tax Identification Number | 83-2676794 |
| Entity Incorporation, State Country Name | DE |
| Entity Address, Address Line One | 6401 Congress Avenue, Suite 250 |
| Entity Address, City or Town | Boca Raton |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33487 |
| City Area Code | 561 |
| Local Phone Number | 559-4111 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.00001 per share |
| Trading Symbol | JNVR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
