Latest Package Version Lookup

Query the deps.dev API to get the latest stable version of open source packages.

Supported Ecosystems

Ecosystem	System ID	Example Package
npm	npm	express, @types/node
PyPI	pypi	requests, django
Go	go	github.com/gin-gonic/gin
Cargo	cargo	serde, tokio
Maven	maven	org.springframework:spring-core
NuGet	nuget	Newtonsoft.Json

Workflow

Think step-by-step:

1. Identify the ecosystem from context:

   • package.json or node_modules → npm
   • requirements.txt, pyproject.toml, setup.py → pypi
   • go.mod, go.sum → go
   • Cargo.toml → cargo
   • pom.xml, build.gradle → maven
   • *.csproj, packages.config → nuget
   • If unclear, ask the user

2. Run the get-versions script:

SCRIPT=scripts/get-versions.py
python3 $SCRIPT <system> <pkg1> [pkg2] ...

1. Report the results from the JSON output

Script Usage

Single package:

python3 scripts/get-versions.py npm express

Multiple packages:

python3 scripts/get-versions.py npm express lodash @types/node

Different ecosystems:

python3 scripts/get-versions.py pypi requests django flask
python3 scripts/get-versions.py go github.com/gin-gonic/gin
python3 scripts/get-versions.py maven org.springframework:spring-core

Output Format

The script outputs JSON with the following structure:

{
  "system": "npm",
  "packages": [
    {
      "package": "express",
      "version": "5.0.0",
      "publishedAt": "2024-09-10T04:40:34Z",
      "isDeprecated": false
    },
    {
      "package": "lodash",
      "version": "4.17.21",
      "publishedAt": "2021-02-20T15:42:16Z",
      "isDeprecated": false
    }
  ]
}

Error response:

{
  "system": "npm",
  "packages": [
    {
      "package": "nonexistent-pkg",
      "error": "HTTP 404: Not Found"
    }
  ]
}

Error Handling

• HTTP 404: Package not found - check spelling and ecosystem
• Network error: deps.dev API may be temporarily unavailable
• No default version: Script returns the latest available version with a note

Rules

• Always use the script instead of manual curl commands
• The script handles URL encoding automatically
• Multiple packages are fetched in parallel for efficiency
• Use isDeprecated field to warn users about deprecated packages