string-replace-middleware

Express middleware that performs stream-based string replacement in HTTP response bodies on the fly. Current stable version is 1.1.0, released under MIT license, with infrequent updates. Key differentiator: works on the response stream before sending, unlike typical string replacement that buffers entire responses. Supports configurable Content-Type filtering via regex (default: text/*, application/json, application/xml). Ships TypeScript type declarations. Requires Node >=10 and Express. Not recommended for production with large or streaming responses due to potential performance overhead.