| 1 | # Pure JavaScript gRPC Client
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| 2 |
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| 3 | ## Installation
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| 4 |
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| 5 | Node 12 is recommended. The exact set of compatible Node versions can be found in the `engines` field of the `package.json` file.
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| 6 |
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| 7 | ```sh
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| 8 | npm install @grpc/grpc-js
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| 9 | ```
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| 10 |
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| 11 | ## Documentation
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| 12 |
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| 13 | Documentation specifically for the `@grpc/grpc-js` package is currently not available. However, [documentation is available for the `grpc` package](https://grpc.github.io/grpc/node/grpc.html), and the two packages contain mostly the same interface. There are a few notable differences, however, and these differences are noted in the "Migrating from grpc" section below.
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| 14 |
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| 15 | ## Features
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| 16 |
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| 17 | - Clients
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| 18 | - Automatic reconnection
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| 19 | - Servers
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| 20 | - Streaming
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| 21 | - Metadata
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| 22 | - Partial compression support: clients can decompress response messages
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| 23 | - Pick first and round robin load balancing policies
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| 24 | - Client Interceptors
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| 25 | - Connection Keepalives
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| 26 | - HTTP Connect support (proxies)
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| 27 |
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| 28 | This library does not directly handle `.proto` files. To use `.proto` files with this library we recommend using the `@grpc/proto-loader` package.
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| 29 |
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| 30 | ## Migrating from [`grpc`](https://www.npmjs.com/package/grpc)
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| 31 |
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| 32 | `@grpc/grpc-js` is almost a drop-in replacement for `grpc`, but you may need to make a few code changes to use it:
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| 33 |
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| 34 | - If you are currently loading `.proto` files using `grpc.load`, that function is not available in this library. You should instead load your `.proto` files using `@grpc/proto-loader` and load the resulting package definition objects into `@grpc/grpc-js` using `grpc.loadPackageDefinition`.
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| 35 | - If you are currently loading packages generated by `grpc-tools`, you should instead generate your files using the `generate_package_definition` option in `grpc-tools`, then load the object exported by the generated file into `@grpc/grpc-js` using `grpc.loadPackageDefinition`.
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| 36 | - If you have a server and you are using `Server#bind` to bind ports, you will need to use `Server#bindAsync` instead.
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| 37 |
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| 38 | ## Some Notes on API Guarantees
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| 39 |
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| 40 | The public API of this library follows semantic versioning, with some caveats:
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| 41 |
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| 42 | - Some methods are prefixed with an underscore. These methods are internal and should not be considered part of the public API.
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| 43 | - The class `Call` is only exposed due to limitations of TypeScript. It should not be considered part of the public API.
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| 44 | - In general, any API that is exposed by this library but is not exposed by the `grpc` library is likely an error and should not be considered part of the public API.
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| 45 | - The `grpc.experimental` namespace contains APIs that have not stabilized. Any API in that namespace may break in any minor version update.
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