64 lines
2.1 KiB
Markdown
64 lines
2.1 KiB
Markdown
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# VSCode JSON RPC
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[](https://npmjs.org/package/vscode-jsonrpc)
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[](https://npmjs.org/package/vscode-jsonrpc)
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[](https://travis-ci.org/Microsoft/vscode-languageserver-node)
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This npm module implements the base messaging protocol spoken between a VSCode language server and a VSCode language client.
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The npm module can also be used standalone to establish a [JSON-RPC](http://www.jsonrpc.org/) channel between
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a client and a server. Below an example how to setup a JSON-RPC connection. First the client side.
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```ts
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import * as cp from 'child_process';
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import * as rpc from 'vscode-jsonrpc';
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let childProcess = cp.spawn(...);
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// Use stdin and stdout for communication:
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let connection = rpc.createMessageConnection(
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new rpc.StreamMessageReader(childProcess.stdout),
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new rpc.StreamMessageWriter(childProcess.stdin));
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let notification = new NotificationType<string, void>('testNotification');
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connection.listen();
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connection.sendNotification(notification, 'Hello World');
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```
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The server side looks very symmetrical:
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```ts
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import * as rpc from 'vscode-jsonrpc';
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let connection = rpc.createMessageConnection(
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new rpc.StreamMessageReader(process.stdin),
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new rpc.StreamMessageWriter(process.stdout));
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let notification = new NotificationType<string, void>('testNotification');
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connection.onNotification(notification, (param: string) => {
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console.log(param); // This prints Hello World
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});
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connection.listen();
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```
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# History
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### 4.0.0
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- move JS target to ES6.
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### 3.0.0:
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- converted the NPM module to use TypeScript 2.0.3.
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- added strict null support.
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- support for passing more than one parameter to a request or notification.
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- Breaking changes:
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- due to the use of TypeScript 2.0.3 and differences in d.ts generation users of the new version need to move to
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TypeScript 2.0.3 as well.
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## License
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[MIT](https://github.com/Microsoft/vscode-languageserver-node/blob/master/License.txt)
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