You can install Replicache JS SDK from npm.

npm install replicache

The binaries are downloaded when you do npm install. If for some reason you need to redownload these you can manually run tool/build.sh. Do this again whenever you update the SDK.

Currently, the JavaScript SDK relies on a native local server that implements the guts of the sync protocol on the client side. This is temporary and will be removed.

For now, you must have this server running whenever you are working with the SDK:

mkdir ~/.repm
npx test-server --storage-dir=$HOME/.repm

See Replicache Server Setup for server-side instructions.

For the rest of these instructions we will assume your data layer is running on localhost:3000.

In production, your app will talk to the production Replicache diff-server at https://serve.replicache.dev/.

During development, that server can't reach your workstation, so we provide a development instance to work against instead. Leave this running in a tab:

# The --client-view flag should point to the Client View endpoint
# on your development data layer.
npx diff-server --client-view="http://localhost:3000/replicache-client-view"

It is recommended to use ES modules (but we also include CommonJS for backwards compat).

import Replicache, {REPMHTTPInvoker} from 'replicache';

To use Replicache you currently have to tell it how to invoke the Replicache Client API Module (REPM). This implementation detail will be hidden/removed in the future.

const diffServerURL = 'https://serve.replicache.dev/pull';
const diffServerAuth = '<your diff-server account ID>';
const batchURL = 'https://youservice.com/replicache-batch';
const dataLayerAuth = '<your data-layer auth token>';
const repmInvoker = new REPMHTTPInvoker('http://localhost:7002');
const repmInvoke = repmInvoker.invoke;
const replicache = new Replicache({
  diffServerURL,
  diffServerAuth,
  batchURL,
  dataLayerAuth,
  repmInvoke,
});
const value = await replicache.query(tx => tx.get('/hello'));
console.log(value);