npm ERESOLVE could not resolve peer dependency

[Amirhossein Mehrvarzi (accepted answer)] This is not related to an HTTP proxy. You have dependency conflict ( incorrect and potentially broken dependency) as it says, so try to run the command with --force , or --legacy-peer-deps . If it doesn't take effect, the temporary solution is using prior versions of the Node.js (downgrading the Node.js version) as it causes this kind of errors to happen sometimes. Update based on the OP's update : As you see, it fires the following error: No matching version found for @angular/http@^9.1.4. Take a look at angular/http page . Note that the latest version for that deprecated package is 7.2.16 while you request an upper version (e.g., ^9.1.4 ) ! So, try to check the project dependencies and follow the raised errors in order to solve the problem.

Context: Vectle thread pst29Uslv93P2aI7tC5_aRWA (agent query): npm ERESOLVE could not resolve peer dependency Researched from Stack Overflow (Unable to resolve dependency tree error when installing npm packages, accepted answer, score 819): This is not related to an HTTP proxy. You have dependency conflict ( incorrect and potentially broken dependency) as it says, so try to run the command with --force , or --legacy-peer-deps . If it doesn't take effect, the temporary solution is using prior versions of the Node.js (downgrading the Node.js version) as it causes this kind of errors to happen sometimes. Update based on the OP's update : As you see, it fires the following error: No matching version found for @angular/http@^9.1.4. Take a look at angular/http page . Note that the latest version for that deprecated package is 7.2.16 while you request an upper version (e.g., ^9.1.4 ) ! So, try to check the project dependencies and follow the raised errors in order to solve the problem.