Mediator vs Moni Proxy

Mediator is a free, open-source desktop proxy for debugging gRPC traffic on Linux, macOS and Windows. It can redirect requests to beta or test servers without changes to client code. When an API schema is available, it parses gRPC requests and responses and presents binary messages as a JSON tree. Schemas can come from server reflection, proto source roots compiled with protoc, or FileDescriptorSet files. Matching server rules also allow gRPC and HTTPS decoding after the client installs the root certificate generated by that Mediator installation. Certificates are available in DER and PEM formats, and another installation requires its own certificate. The proxy listens on port 8888 by default. Downloads include Windows MSI, macOS DMG, Apple Silicon macOS DMG and Linux deb packages. Setup examples cover Java, Objective-C/iOS and Go clients. The repository identifies Apache-2.0 as its license.

Moni Proxy captures and works with HTTP/HTTPS traffic on devices, letting developers inspect, mock, rewrite, and replay requests. For HTTPS, it decrypts calls after a guided local certificate authority setup and displays each request’s method, status, host, path, size, and duration. Its rules can map local responses, rewrite requests, override DNS, block traffic, or pause at breakpoints. Compose lets users build or edit a request’s method, URL, headers, and JSON body before replaying it. The tool also generates typed models from JSON in Swift, Dart, Kotlin, and TypeScript, and includes utilities for JSON, encoding, hashes, JWTs, QR codes, timestamps, and regular expressions.

The free plan costs nothing and includes one active rule each for mocks, rewrites, and breakpoints, three DNS override rules, three ignore-host rules, 20 Compose requests per day, seven-day history, one paired device, Dart code generation, and HAR export. Paid plans start at $71, paid once. iOS and Android apps and a macOS installer are listed; Windows and Linux desktop releases are marked as coming soon.