Paste package.json for instant dependency analysis, version conflicts, and type distribution
Zero Dependencies Β· Works Offlineπ Paste package.json
What Can the npm Dependency Analyzer Do?
The npm Dependency Analyzer is a free online tool that quickly analyzes dependency relationships in your package.json. It supports parsing dependencies, devDependencies, peerDependencies, and more, detecting version ranges, potential conflicts, duplicate dependencies, and visualizing dependency distribution with charts. All analysis runs locally in your browser β your package.json is never uploaded to any server.
Core Features
- Multi-type Dependency Parsing: Supports dependencies, devDependencies, peerDependencies, optionalDependencies, bundledDependencies
- Version Range Analysis: Parses ^, ~, >= and other semver range operators, highlighting exact vs. range versions
- Conflict Detection: Detects version conflicts for the same package across different dependency types and peer dependency mismatches
- Visual Distribution: Charts showing dependency type distribution ratios
- Report Export: Copy or download analysis reports
How to Use
1. Paste your package.json content into the input box, or drag and drop the file.
2. Select analysis options (version range analysis, conflict detection).
3. Click "Analyze Dependencies" to see results.
4. Review the dependency type distribution chart and detailed dependency list.
5. Copy or download the analysis report.
Use Cases
Case 1: Project Dependency Audit
When taking over a new project, quickly understand the full dependency landscape and identify core vs. dev dependencies.
Case 2: Version Upgrade Planning
Analyze current version ranges for major upgrades (e.g., React 17β18) and identify potential compatibility issues.
Case 3: Dependency Slimming
Find unused dependencies and replaceable heavy dependencies (lodashβes-toolkit) to optimize bundle size.
Case 4: Security Audit
Check if dependency version ranges are too broad (e.g., using * or latest) and narrow them to reduce supply chain attack risk.
Technical Background
npm semver version ranges use operators like ^ and ~: ^1.2.3 allows β₯1.2.3 and <2.0.0 (compatible minor updates), while ~1.2.3 allows β₯1.2.3 and <1.3.0 (patch updates only). Using * or latest installs any version, posing security risks. peerDependencies let plugins declare version requirements for host packages β npm v7+ auto-installs peer deps, with warnings on mismatches. Best practice: lock production dependencies to exact versions, use ranges for dev dependencies, and pair with package-lock.json for reproducible builds.
β FAQ
Which dependency types are supported?
dependencies, devDependencies, peerDependencies, optionalDependencies, and bundledDependencies.
Is data uploaded?
No. Pure frontend β all analysis runs in your browser. Your package.json never leaves your device.
How are conflicts detected?
Parses semver ranges and detects incompatible version ranges for the same package across dependency types.
Does it support monorepos?
Currently analyzes a single package.json. For monorepos, analyze each sub-package separately.
What do version range operators mean?
^ allows compatible minor updates, ~ allows only patch updates, * allows any version (security risk).
Is drag-and-drop supported?
Yes. Drag a package.json file onto the input box to auto-read it.