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[](https://www.npmjs.com/package/grpc)
# Node.js gRPC Library
## Status
Beta
## PREREQUISITES
- `node`: This requires `node` to be installed, version `0.12` or above. If you instead have the `nodejs` executable on Debian, you should install the [`nodejs-legacy`](https://packages.debian.org/sid/nodejs-legacy) package.
- **Note:** If you installed `node` via a package manager and the version is still less than `0.12`, try directly installing it from [nodejs.org](https://nodejs.org).
## INSTALLATION
Install the gRPC NPM package
```sh
npm install grpc
```
## BUILD FROM SOURCE
1. Clone [the grpc Git Repository](https://github.com/grpc/grpc).
2. Run `npm install` from the repository root.
- **Note:** On Windows, this might fail due to [nodejs issue #4932](https://github.com/nodejs/node/issues/4932) in which case, you will see something like the following in `npm install`'s output (towards the very beginning):
```
..
Building the projects in this solution one at a time. To enable parallel build, please add the "/m" switch.
WINDOWS_BUILD_WARNING
"..\IMPORTANT: Due to https:\github.com\nodejs\node\issues\4932, to build this library on Windows, you must first remove C:\Users\jenkins\.node-gyp\4.4.0\include\node\openssl"
...
..
```
To fix this, you will have to delete the folder `C:\Users\<username>\.node-gyp\<node_version>\include\node\openssl` and retry `npm install`
## TESTING
To run the test suite, simply run `npm test` in the install location.
## API
This library internally uses [ProtoBuf.js](https://github.com/dcodeIO/ProtoBuf.js), and some structures it exports match those exported by that library
If you require this module, you will get an object with the following members
```javascript
function load(filename)
```
Takes a filename of a [Protocol Buffer](https://developers.google.com/protocol-buffers/) file, and returns an object representing the structure of the protocol buffer in the following way:
- Namespaces become maps from the names of their direct members to those member objects
- Service definitions become client constructors for clients for that service. They also have a `service` member that can be used for constructing servers.
- Message definitions become Message constructors like those that ProtoBuf.js would create
- Enum definitions become Enum objects like those that ProtoBuf.js would create
- Anything else becomes the relevant reflection object that ProtoBuf.js would create
```javascript
function loadObject(reflectionObject)
```
Returns the same structure that `load` returns, but takes a reflection object from `ProtoBuf.js` instead of a file name.
```javascript
function Server([serverOpions])
```
Constructs a server to which service/implementation pairs can be added.
```javascript
status
```
An object mapping status names to status code numbers.
```javascript
callError
```
An object mapping call error names to codes. This is primarily useful for tracking down certain kinds of internal errors.
```javascript
Credentials
```
An object with factory methods for creating credential objects for clients.
```javascript
ServerCredentials
```
An object with factory methods for creating credential objects for servers.
|
