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API Specification Diff Tool

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library 1.0.6 ·javascript
verified Jun 17, 2026

api-smart-diff is a JavaScript/TypeScript library designed to compute detailed differences between two JSON-based API specifications. It currently supports OpenAPI 3.0, AsyncAPI 2.x, JSON Schema, and GraphQL via GraphApi. Version 1.0.6 is the current stable release, offering a robust set of features for API versioning and changelog generation. Key differentiators include its ability to classify changes into 'breaking', 'non-breaking', 'deprecated', and 'annotation' types, generate human-readable descriptions for each change, and resolve `$ref` pointers (with external bundling). It provides extensive customization options for comparison rules, classification, and output annotation, making it highly adaptable for various CI/CD pipelines and documentation generation tasks. The library works seamlessly in both Node.js and browser environments and ships with full TypeScript support.

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