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Shared Store Service

Exchange data between main process and workers (specs).


The easiest way is to keep @wdio/shared-store-service as a dev dependency in your package.json, via:

npm install @wdio/shared-store-service --save-dev

Instructions on how to install WebdriverIO can be found here.


Get/set a value (a plain object) to/from the store by key (string). The key can be any arbitrary string except * which is reserved as it allows you to fetch the whole store.

Set Values

To set values to the store call:

await browser.sharedStore.set('key', 'foobar123')

Get Values

To get values from the store call:

const value = await browser.sharedStore.get('key')
console.log(value) // returns "foobar123"

You can also fetch all key values by using the * key:

const store = await browser.sharedStore.get('*')
console.log(value) // returns `{ key: "foobar" }`

Access Store in WDIO Hooks

You could also directly access to setValue and getValue async handlers. Make sure you properly call them with the await keyword.

// wdio.conf.js
import { setValue, getValue } from '@wdio/shared-store-service'

export const config = {
// ...
onPrepare: [async function (config, capabilities) {
await setValue('foo', 'bar')
// ...
after: async () => {
const value = await getValue('foo')
// ...

IMPORTANT! Every spec file should be atomic and isolated from others' specs. The idea of the service is to deal with very specific environment setup issues. Please avoid sharing test execution data!

Resource Pools

If the worker threads are competing for resources that must be assigned for each worker, you can use Resource Pool API:

// wdio.conf.js
import { setResourcePool, getValueFromPool, addValueToPool } from '@wdio/shared-store-service'

export const config = {
maxInstances: 2,
// ...
onPrepare: async function (config, capabilities) {
await setResourcePool('availableUrls', ['', ''])
// ...
beforeSession: async (conf) => {
conf.baseUrl = await getValueFromPool('availableUrls');
// ...
afterSession: async (conf) => {
// worker returns the used resource for next workers to use
await addValueToPool('availableUrls', conf.baseUrl);

This example ensures that both workers never use the same baseUrl. A unique url is only assigned to one worker until it's released by it.


Add shared-store to the services list and the sharedStore object will be accessible to you on the browser scope in your test.

// wdio.conf.js
export const config = {
// ...
services: ['shared-store'],
// ...

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