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jhansi.io detects and installs dependencies automatically at exec time — no manual pip install or npm install needed. Dependencies are installed into the sandbox workspace and persist across runs. First exec is slower. Subsequent execs are fast.

Python

File foundAction
pyproject.tomlpip install from project
requirements.txtpip install -r
Neitherpipreqs scans your file and installs what it finds

Node

File foundAction
package.jsonnpm install
Neitherruns as-is

Go

File foundAction
go.modgo mod download
Neithergo mod init + go mod tidy

Java

File foundAction
pom.xmlMaven — mvn dependency:resolve + mvn compile
build.gradleGradle — gradle dependencies + gradle compileJava
Neitherjavac direct compile