v3.22.2.2
Bank loans (Tables)
12 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Bank loans
          
   As of March 31, 
   2022   2021 
         
Unsecured loan from China Construction Bank wholly repayable within 1 year  $257,997   $402,254 
Unsecured loan from Bank of Beijing wholly repayable within 1 year   204,032    —   
  Total unsecured bank loan wholly repayable within 1 year   462,029    402,254 
           
Secured loan from China Construction Bank wholly repayable more than 1 year   366,653    261,251 
Total  $828,682   $663,505