@schematichq/schematic-react

schematic-react

schematic-react is a client-side React library for Schematic which provides hooks to track events, check flags, and more. schematic-react provides the same capabilities as schematic-js, for React apps.

Install

npm install @schematichq/schematic-react
# or
yarn add @schematichq/schematic-react
# or
pnpm add @schematichq/schematic-react

Usage

SchematicProvider

You can use the SchematicProvider to wrap your application and provide the Schematic instance to all components:

import { SchematicProvider } from "@schematichq/schematic-react";

ReactDOM.render(
    <SchematicProvider publishableKey="your-publishable-key">
        <App />
    </SchematicProvider>,
    document.getElementById("root"),
);

Setting context

To set the user context for events and flag checks, you can use the identify function provided by the useSchematicEvents hook:

import { useSchematicEvents } from "@schematichq/schematic-react";

const MyComponent = () => {
    const { identify } = useSchematicEvents();

    useEffect(() => {
        identify({
            keys: { id: "my-user-id" },
            company: {
                keys: { id: "my-company-id" },
                traits: { location: "Atlanta, GA" },
            },
        });
    }, []);

    return <div>My Component</div>;
};

To learn more about identifying companies with the keys map, see key management in Schematic public docs.

Tracking usage

Once you've set the context with identify, you can track events:

import { useSchematicEvents } from "@schematichq/schematic-react";

const MyComponent = () => {
    const { track } = useSchematicEvents();

    useEffect(() => {
        track({ event: "query" });
    }, []);

    return <div>My Component</div>;
};

If you want to record large numbers of the same event at once, or perhaps measure usage in terms of a unit like tokens or memory, you can optionally specify a quantity for your event:

track({ event: "query", quantity: 10 });

Checking flags

To check a flag, you can use the useSchematicFlag hook:

import { useSchematicFlag } from "@schematichq/schematic-react";
import { Feature, Fallback } from "./components";

const MyComponent = () => {
    const isFeatureEnabled = useSchematicFlag("my-flag-key");

    return isFeatureEnabled ? <Feature /> : <Fallback />;
};

Checking entitlements

You can check entitlements (i.e., company access to a feature) using a flag check as well, and using the useSchematicEntitlement hook you can get additional data to render various feature states:

import {
    useSchematicEntitlement,
    useSchematicIsPending,
} from "@schematichq/schematic-react";
import { Feature, Loader, NoAccess } from "./components";

const MyComponent = () => {
    const schematicIsPending = useSchematicIsPending();
    const {
        featureAllocation,
        featureUsage,
        featureUsageExceeded,
        value: isFeatureEnabled,
    } = useSchematicEntitlement("my-flag-key");

    // loading state
    if (schematicIsPending) {
        return <Loader />;
    }

    // usage exceeded state
    if (featureUsageExceeded) {
        return (
            <div>
                You have used all of your usage ({featureUsage} /{" "}
                {featureAllocation})
            </div>
        );
    }

    // either feature state or "no access" state
    return isFeatureEnabled ? <Feature /> : <NoAccess />;
};

Note: useSchematicIsPending is checking if entitlement data has been loaded, typically via identify. It should, therefore, be used to wrap flag and entitlement checks, but never the initial call to identify.

For features metered by credit burndown, the same entitlement object carries the company's credit position:

Property	Type	Description
creditId	string | undefined	The ID of the credit funding this feature
creditSettled	number | undefined	The spendable balance, including any amount held by an open lease. This is the number to show end users
creditRemaining	number | undefined	The balance available to fund new consumption, excluding any open lease hold
creditReserved	number | undefined	The unspent amount held by an open credit lease, 0 when none is open

All four are undefined when the feature is not credit-based.

import { useSchematicEntitlement } from "@schematichq/schematic-react";
import { Feature, OutOfCredits } from "./components";

const MyComponent = () => {
    const { creditSettled, value: isFeatureEnabled } =
        useSchematicEntitlement("my-flag-key");

    if (!isFeatureEnabled) {
        return <OutOfCredits />;
    }

    return <Feature creditsRemaining={creditSettled} />;
};

These values refresh with each flag check. For a balance that also updates on the credit partials arriving between checks, pass creditId to useSchematicCreditBalance instead.

Usage warnings

If a usage warning is configured on the entitlement, the hook returns it as warningTiers, so you can warn a customer before they hit the limit rather than after:

Property	Type	Description
warningTiers	WarningTier[] | undefined	The usage warning thresholds configured on the entitlement, each a { key, value } pair in the entitlement's usage units. undefined when none are configured
softLimit	number | undefined	For usage-based pricing, the soft limit for overage charges or the next tier boundary

The dashboard writes a single tier under the key default.

import { useSchematicEntitlement } from "@schematichq/schematic-react";
import { Feature, ApproachingLimit } from "./components";

const MyComponent = () => {
    const { featureUsage, warningTiers } =
        useSchematicEntitlement("my-flag-key");

    const warning = warningTiers?.find((tier) => tier.key === "default");
    const approachingLimit =
        typeof featureUsage === "number" &&
        typeof warning?.value === "number" &&
        featureUsage >= warning.value;

    return (
        <>
            {approachingLimit && <ApproachingLimit limit={warning.value} />}
            <Feature />
        </>
    );
};

Company plan information

To access the current company's plan and trial status, you can use the useSchematicPlan hook:

import { useSchematicPlan } from "@schematichq/schematic-react";

const MyComponent = () => {
    const plan = useSchematicPlan();

    if (!plan) {
        return <div>No plan assigned</div>;
    }

    return (
        <div>
            <p>Current plan: {plan.name}</p>

            {plan.trialStatus === "active" && (
                <p>Trial ends: {plan.trialEndDate?.toLocaleDateString()}</p>
            )}

            {plan.trialStatus === "expired" && (
                <p>Your trial has ended. <a href="/upgrade">Upgrade now</a></p>
            )}
        </div>
    );
};

The hook returns an object with the following properties:

Property	Type	Description
id	string	The plan ID
name	string	The plan name
trialEndDate	Date | undefined	The trial end date, if the company has or had a trial
trialStatus	"active" | "expired" | "converted" | undefined	The company's trial status: active if the trial is ongoing, expired if the trial ended without conversion, converted if the company converted to a paid plan, or undefined if the company has never trialed

Credit balances

To display a company's credit balance, use the useSchematicCreditBalance hook. It is keyed by credit ID and updates reactively as the balance changes over the DataStream:

import { useSchematicCreditBalance } from "@schematichq/schematic-react";

const CreditMeter = () => {
    const { balance, isLoading } = useSchematicCreditBalance("credit-id");

    if (isLoading) {
        return <div>Loading…</div>;
    }

    return <div>{balance} credits remaining</div>;
};

The hook returns an object with the following properties:

Property	Type	Description
balance	number	The spendable balance, or 0 while loading or when the company holds no balance in this credit
isLoading	boolean	true while the balance is still loading and no value has arrived yet

The credit ID is available on a feature's entitlement, and the hook accepts string | undefined, so you can feed it straight through without waiting for the check to arrive:

const CreditMeter = () => {
    const { creditId } = useSchematicEntitlement("my-flag-key");
    const { balance, isLoading } = useSchematicCreditBalance(creditId);

    if (isLoading) {
        return <div>Loading…</div>;
    }

    return <div>{balance} credits remaining</div>;
};

While creditId is undefined, the hook reports the client's loading state and a balance of 0.

Fallback Behavior

The SDK includes built-in fallback behavior you can use to ensure your application continues to function even when unable to reach Schematic (e.g., during service disruptions or network issues).

Flag Check Fallbacks

When flag checks cannot reach Schematic, they use fallback values in the following priority order:

• Callsite fallback - fallback values can be provided directly in the hook options
• Initialization defaults - fallback values configured via flagCheckDefaults or flagValueDefaults options when initializing the provider
• Default value - Returns false if no fallback is configured

// Provide a fallback value at the callsite
import { useSchematicFlag } from "@schematichq/schematic-react";

const MyComponent = () => {
    const isFeatureEnabled = useSchematicFlag("feature-flag", {
        fallback: true,  // Used if API request fails
    });

    return isFeatureEnabled ? <Feature /> : <Fallback />;
};

// Or configure defaults at initialization
import { SchematicProvider } from "@schematichq/schematic-react";

ReactDOM.render(
    <SchematicProvider
        publishableKey="your-publishable-key"
        flagValueDefaults={{
            "feature-flag": true,  // Used if API request fails and no callsite fallback
        }}
        flagCheckDefaults={{
            "another-flag": {
                flag: "another-flag",
                value: true,
                reason: "Default value",
            },
        }}
    >
        <App />
    </SchematicProvider>,
    document.getElementById("root"),
);

Event Queueing and Retry

When events (track, identify) cannot be sent due to network issues, they are automatically queued and retried:

• Events are queued in memory (up to 100 events by default, configurable via maxEventQueueSize)
• Failed events are retried with exponential backoff (up to 5 attempts by default, configurable via maxEventRetries)
• Events are automatically flushed when the network connection is restored
• Events queued when the page is hidden are sent when the page becomes visible

WebSocket Fallback

In WebSocket mode, if the WebSocket connection fails, the SDK will provide the last known value or the configured fallback values as outlined above. The WebSocket will also automatically attempt to re-establish its connection with Schematic using an exponential backoff.

React Native

Handling app background/foreground

When a React Native app is backgrounded for an extended period, the WebSocket connection may be closed by the OS. When the app returns to the foreground, the connection will automatically reconnect, but this happens on an exponential backoff timer which may cause a delay before fresh flag values are available.

For cases where you need immediate flag updates when returning to the foreground (e.g., after an in-app purchase), you can use one of these methods to re-establish the connection:

• forceReconnect(): Always closes and re-establishes the WebSocket connection, guaranteeing fresh values
• reconnectIfNeeded(): Only reconnects if the current connection is unhealthy (more efficient for frequent foreground events)

import { useSchematic } from "@schematichq/schematic-react";
import { useEffect } from "react";
import { AppState } from "react-native";

const SchematicAppStateHandler = () => {
    const { client } = useSchematic();

    useEffect(() => {
        const subscription = AppState.addEventListener("change", (state) => {
            if (state === "active") {
                // Use forceReconnect() for guaranteed fresh values
                client.forceReconnect();
                // Or use reconnectIfNeeded() to skip if connection is healthy
                // client.reconnectIfNeeded();
            }
        });
        return () => subscription.remove();
    }, [client]);

    return null;
};

Render this inside your SchematicProvider.

Troubleshooting

For debugging and development, Schematic supports two special modes:

Debug Mode

Enables console logging of all Schematic operations:

// Enable at initialization
import { SchematicProvider } from "@schematichq/schematic-react";

ReactDOM.render(
    <SchematicProvider publishableKey="your-publishable-key" debug={true}>
        <App />
    </SchematicProvider>,
    document.getElementById("root"),
);

// Or via URL parameter
// https://yoursite.com/?schematic_debug=true

Offline Mode

Prevents network requests and returns fallback values for all flag checks:

// Enable at initialization
import { SchematicProvider } from "@schematichq/schematic-react";

ReactDOM.render(
    <SchematicProvider publishableKey="your-publishable-key" offline={true}>
        <App />
    </SchematicProvider>,
    document.getElementById("root"),
);

// Or via URL parameter
// https://yoursite.com/?schematic_offline=true

Offline mode automatically enables debug mode to help with troubleshooting.

License

MIT

Support

Need help? Please open a GitHub issue or reach out to [e-mail] and we'll be happy to assist.