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HubSpot Java API Library

Maven Central javadoc

The HubSpot Java SDK provides convenient access to HubSpot's date-versioned REST API (2026-03 release) from applications written in Java.

It is generated with Stainless.

The REST API documentation can be found on developers.hubspot.com. Javadocs are available on javadoc.io.

Installation

Gradle

implementation("com.hubspot.sdk:hubspot-java:0.1.0-alpha.5")

Maven

<dependency>
  <groupId>com.hubspot.sdk</groupId>
  <artifactId>hubspot-java</artifactId>
  <version>0.1.0-alpha.5</version>
</dependency>

Requirements

This library requires Java 8 or later.

Usage

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;
import com.hubspot.sdk.models.crm.objects.SimplePublicObjectWithAssociations;
import com.hubspot.sdk.models.crm.objects.contacts.ContactGetParams;

HubSpotClient client = HubSpotOkHttpClient.builder()
    // Configures using the `hubspot.baseUrl` system property
    // Or configures using the `HUBSPOT_BASE_URL` environment variable
    .fromEnv()
    .accessToken("My Access Token")
    .build();

SimplePublicObjectWithAssociations result = client.crm().objects().contacts().get("contactId");

Client configuration

Configure the client using system properties or environment variables:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;

HubSpotClient client = HubSpotOkHttpClient.builder()
    // Configures using the `hubspot.baseUrl` system property
    // Or configures using the `HUBSPOT_BASE_URL` environment variable
    .fromEnv()
    .accessToken("My Access Token")
    .build();

Or manually:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;

HubSpotClient client = HubSpotOkHttpClient.builder()
    .accessToken("My Access Token")
    .build();

Or using a combination of the two approaches:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;

HubSpotClient client = HubSpotOkHttpClient.builder()
    // Configures using the `hubspot.baseUrl` system property
    // Or configures using the `HUBSPOT_BASE_URL` environment variable
    .fromEnv()
    .accessToken("My Access Token")
    .build();

See this table for the available options:

Setter System property Environment variable Required Default value
baseUrl hubspot.baseUrl HUBSPOT_BASE_URL true "https://api.hubapi.com"

System properties take precedence over environment variables.

Tip

Don't create more than one client in the same application. Each client has a connection pool and thread pools, which are more efficient to share between requests.

Modifying configuration

To temporarily use a modified client configuration, while reusing the same connection and thread pools, call withOptions() on any client or service:

import com.hubspot.sdk.client.HubSpotClient;

HubSpotClient clientWithOptions = client.withOptions(optionsBuilder -> {
    optionsBuilder.baseUrl("https://example.com");
    optionsBuilder.maxRetries(42);
});

The withOptions() method does not affect the original client or service.

Requests and responses

To send a request to the HubSpot API, build an instance of some Params class and pass it to the corresponding client method. When the response is received, it will be deserialized into an instance of a Java class.

For example, client.crm().objects().contacts().get(...) should be called with an instance of ContactGetParams, and it will return an instance of SimplePublicObjectWithAssociations.

Immutability

Each class in the SDK has an associated builder or factory method for constructing it.

Each class is immutable once constructed. If the class has an associated builder, then it has a toBuilder() method, which can be used to convert it back to a builder for making a modified copy.

Because each class is immutable, builder modification will never affect already built class instances.

Asynchronous execution

The default client is synchronous. To switch to asynchronous execution, call the async() method:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;
import com.hubspot.sdk.models.crm.objects.SimplePublicObjectWithAssociations;
import com.hubspot.sdk.models.crm.objects.contacts.ContactGetParams;
import java.util.concurrent.CompletableFuture;

HubSpotClient client = HubSpotOkHttpClient.builder()
    // Configures using the `hubspot.baseUrl` system property
    // Or configures using the `HUBSPOT_BASE_URL` environment variable
    .fromEnv()
    .accessToken("My Access Token")
    .build();

CompletableFuture<SimplePublicObjectWithAssociations> result = client.async().crm().objects().contacts().get("contactId");

Or create an asynchronous client from the beginning:

import com.hubspot.sdk.client.HubSpotClientAsync;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClientAsync;
import com.hubspot.sdk.models.crm.objects.SimplePublicObjectWithAssociations;
import com.hubspot.sdk.models.crm.objects.contacts.ContactGetParams;
import java.util.concurrent.CompletableFuture;

HubSpotClientAsync client = HubSpotOkHttpClientAsync.builder()
    // Configures using the `hubspot.baseUrl` system property
    // Or configures using the `HUBSPOT_BASE_URL` environment variable
    .fromEnv()
    .accessToken("My Access Token")
    .build();

CompletableFuture<SimplePublicObjectWithAssociations> result = client.crm().objects().contacts().get("contactId");

The asynchronous client supports the same options as the synchronous one, except most methods return CompletableFutures.

File uploads

The SDK defines methods that accept files.

To upload a file, pass a Path:

import com.hubspot.sdk.models.cms.hubdb.ImportResult;
import com.hubspot.sdk.models.cms.hubdb.tables.TableImportDraftParams;
import java.nio.file.Paths;

TableImportDraftParams params = TableImportDraftParams.builder()
    .tableIdOrName("tableIdOrName")
    .file(Paths.get("/path/to/file"))
    .build();
ImportResult importResult = client.cms().hubdb().tables().importDraft(params);

Or an arbitrary InputStream:

import com.hubspot.sdk.models.cms.hubdb.ImportResult;
import com.hubspot.sdk.models.cms.hubdb.tables.TableImportDraftParams;
import java.net.URL;

TableImportDraftParams params = TableImportDraftParams.builder()
    .tableIdOrName("tableIdOrName")
    .file(new URL("https://example.com//path/to/file").openStream())
    .build();
ImportResult importResult = client.cms().hubdb().tables().importDraft(params);

Or a byte[] array:

import com.hubspot.sdk.models.cms.hubdb.ImportResult;
import com.hubspot.sdk.models.cms.hubdb.tables.TableImportDraftParams;

TableImportDraftParams params = TableImportDraftParams.builder()
    .tableIdOrName("tableIdOrName")
    .file("content".getBytes())
    .build();
ImportResult importResult = client.cms().hubdb().tables().importDraft(params);

Note that when passing a non-Path its filename is unknown so it will not be included in the request. To manually set a filename, pass a MultipartField:

import com.hubspot.sdk.core.MultipartField;
import com.hubspot.sdk.models.cms.hubdb.ImportResult;
import com.hubspot.sdk.models.cms.hubdb.tables.TableImportDraftParams;
import java.io.InputStream;
import java.net.URL;

TableImportDraftParams params = TableImportDraftParams.builder()
    .tableIdOrName("tableIdOrName")
    .file(MultipartField.<InputStream>builder()
        .value(new URL("https://example.com//path/to/file").openStream())
        .filename("/path/to/file")
        .build())
    .build();
ImportResult importResult = client.cms().hubdb().tables().importDraft(params);

Binary responses

The SDK defines methods that return binary responses, which are used for API responses that shouldn't necessarily be parsed, like non-JSON data.

These methods return HttpResponse:

import com.hubspot.sdk.core.http.HttpResponse;
import com.hubspot.sdk.models.auth.oauth.OAuthCreateTokenParams;

HttpResponse response = client.auth().oauth().createToken();

To save the response content to a file, use the Files.copy(...) method:

import com.hubspot.sdk.core.http.HttpResponse;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

try (HttpResponse response = client.auth().oauth().createToken(params)) {
    Files.copy(
        response.body(),
        Paths.get(path),
        StandardCopyOption.REPLACE_EXISTING
    );
} catch (Exception e) {
    System.out.println("Something went wrong!");
    throw new RuntimeException(e);
}

Or transfer the response content to any OutputStream:

import com.hubspot.sdk.core.http.HttpResponse;
import java.nio.file.Files;
import java.nio.file.Paths;

try (HttpResponse response = client.auth().oauth().createToken(params)) {
    response.body().transferTo(Files.newOutputStream(Paths.get(path)));
} catch (Exception e) {
    System.out.println("Something went wrong!");
    throw new RuntimeException(e);
}

Raw responses

The SDK defines methods that deserialize responses into instances of Java classes. However, these methods don't provide access to the response headers, status code, or the raw response body.

To access this data, prefix any HTTP method call on a client or service with withRawResponse():

import com.hubspot.sdk.core.JsonValue;
import com.hubspot.sdk.core.http.Headers;
import com.hubspot.sdk.core.http.HttpResponseFor;
import com.hubspot.sdk.models.AssociationSpec;
import com.hubspot.sdk.models.PublicObjectId;
import com.hubspot.sdk.models.crm.SimplePublicObject;
import com.hubspot.sdk.models.crm.objects.PublicAssociationsForObject;
import com.hubspot.sdk.models.crm.objects.SimplePublicObjectInputForCreate;

SimplePublicObjectInputForCreate params = SimplePublicObjectInputForCreate.builder()
    .addAssociation(PublicAssociationsForObject.builder()
        .to(PublicObjectId.builder()
            .id("id")
            .build())
        .addType(AssociationSpec.builder()
            .associationCategory(AssociationSpec.AssociationCategory.HUBSPOT_DEFINED)
            .associationTypeId(0)
            .build())
        .build())
    .properties(SimplePublicObjectInputForCreate.Properties.builder()
        .putAdditionalProperty("foo", JsonValue.from("string"))
        .build())
    .build();
HttpResponseFor<SimplePublicObject> simplePublicObject = client.crm().objects().contacts().withRawResponse().create(params);

int statusCode = simplePublicObject.statusCode();
Headers headers = simplePublicObject.headers();

You can still deserialize the response into an instance of a Java class if needed:

import com.hubspot.sdk.models.crm.SimplePublicObject;

SimplePublicObject parsedSimplePublicObject = simplePublicObject.parse();

Error handling

The SDK throws custom unchecked exception types:

Pagination

The SDK defines methods that return a paginated lists of results. It provides convenient ways to access the results either one page at a time or item-by-item across all pages.

Auto-pagination

To iterate through all results across all pages, use the autoPager() method, which automatically fetches more pages as needed.

When using the synchronous client, the method returns an Iterable

import com.hubspot.sdk.models.crm.objects.SimplePublicObjectWithAssociations;
import com.hubspot.sdk.models.crm.objects.contacts.ContactListPage;

ContactListPage page = client.crm().objects().contacts().list();

// Process as an Iterable
for (SimplePublicObjectWithAssociations contact : page.autoPager()) {
    System.out.println(contact);
}

// Process as a Stream
page.autoPager()
    .stream()
    .limit(50)
    .forEach(contact -> System.out.println(contact));

When using the asynchronous client, the method returns an AsyncStreamResponse:

import com.hubspot.sdk.core.http.AsyncStreamResponse;
import com.hubspot.sdk.models.crm.objects.SimplePublicObjectWithAssociations;
import com.hubspot.sdk.models.crm.objects.contacts.ContactListPageAsync;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;

CompletableFuture<ContactListPageAsync> pageFuture = client.async().crm().objects().contacts().list();

pageFuture.thenRun(page -> page.autoPager().subscribe(contact -> {
    System.out.println(contact);
}));

// If you need to handle errors or completion of the stream
pageFuture.thenRun(page -> page.autoPager().subscribe(new AsyncStreamResponse.Handler<>() {
    @Override
    public void onNext(SimplePublicObjectWithAssociations contact) {
        System.out.println(contact);
    }

    @Override
    public void onComplete(Optional<Throwable> error) {
        if (error.isPresent()) {
            System.out.println("Something went wrong!");
            throw new RuntimeException(error.get());
        } else {
            System.out.println("No more!");
        }
    }
}));

// Or use futures
pageFuture.thenRun(page -> page.autoPager()
    .subscribe(contact -> {
        System.out.println(contact);
    })
    .onCompleteFuture()
    .whenComplete((unused, error) -> {
        if (error != null) {
            System.out.println("Something went wrong!");
            throw new RuntimeException(error);
        } else {
            System.out.println("No more!");
        }
    }));

Manual pagination

To access individual page items and manually request the next page, use the items(), hasNextPage(), and nextPage() methods:

import com.hubspot.sdk.models.crm.objects.SimplePublicObjectWithAssociations;
import com.hubspot.sdk.models.crm.objects.contacts.ContactListPage;

ContactListPage page = client.crm().objects().contacts().list();
while (true) {
    for (SimplePublicObjectWithAssociations contact : page.items()) {
        System.out.println(contact);
    }

    if (!page.hasNextPage()) {
        break;
    }

    page = page.nextPage();
}

Logging

The SDK uses the standard OkHttp logging interceptor.

Enable logging by setting the HUBSPOT_LOG environment variable to info:

export HUBSPOT_LOG=info

Or to debug for more verbose logging:

export HUBSPOT_LOG=debug

ProGuard and R8

Although the SDK uses reflection, it is still usable with ProGuard and R8 because hubspot-java-core is published with a configuration file containing keep rules.

ProGuard and R8 should automatically detect and use the published rules, but you can also manually copy the keep rules if necessary.

Jackson

The SDK depends on Jackson for JSON serialization/deserialization. It is compatible with version 2.13.4 or higher, but depends on version 2.18.2 by default.

The SDK throws an exception if it detects an incompatible Jackson version at runtime (e.g. if the default version was overridden in your Maven or Gradle config).

If the SDK threw an exception, but you're certain the version is compatible, then disable the version check using the checkJacksonVersionCompatibility on HubSpotOkHttpClient or HubSpotOkHttpClientAsync.

Caution

We make no guarantee that the SDK works correctly when the Jackson version check is disabled.

Also note that there are bugs in older Jackson versions that can affect the SDK. We don't work around all Jackson bugs (example) and expect users to upgrade Jackson for those instead.

Network options

Retries

The SDK automatically retries 2 times by default, with a short exponential backoff between requests.

Only the following error types are retried:

  • Connection errors (for example, due to a network connectivity problem)
  • 408 Request Timeout
  • 409 Conflict
  • 429 Rate Limit
  • 5xx Internal

The API may also explicitly instruct the SDK to retry or not retry a request.

To set a custom number of retries, configure the client using the maxRetries method:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;

HubSpotClient client = HubSpotOkHttpClient.builder()
    .fromEnv()
    .maxRetries(4)
    .accessToken("My Access Token")
    .build();

Timeouts

Requests time out after 1 minute by default.

To set a custom timeout, configure the method call using the timeout method:

import com.hubspot.sdk.models.crm.SimplePublicObject;

SimplePublicObject simplePublicObject = client.crm().objects().contacts().create(
  params, RequestOptions.builder().timeout(Duration.ofSeconds(30)).build()
);

Or configure the default for all method calls at the client level:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;
import java.time.Duration;

HubSpotClient client = HubSpotOkHttpClient.builder()
    .fromEnv()
    .timeout(Duration.ofSeconds(30))
    .accessToken("My Access Token")
    .build();

Proxies

To route requests through a proxy, configure the client using the proxy method:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;
import java.net.InetSocketAddress;
import java.net.Proxy;

HubSpotClient client = HubSpotOkHttpClient.builder()
    .fromEnv()
    .proxy(new Proxy(
      Proxy.Type.HTTP, new InetSocketAddress(
        "https://example.com", 8080
      )
    ))
    .accessToken("My Access Token")
    .build();

If the proxy responds with 407 Proxy Authentication Required, supply credentials by also configuring proxyAuthenticator:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;
import com.hubspot.sdk.core.http.ProxyAuthenticator;

HubSpotClient client = HubSpotOkHttpClient.builder()
    .fromEnv()
    .proxy(...)
    // Or a custom implementation of `ProxyAuthenticator`.
    .proxyAuthenticator(ProxyAuthenticator.basic("username", "password"))
    .accessToken("My Access Token")
    .build();

Connection pooling

To customize the underlying OkHttp connection pool, configure the client using the maxIdleConnections and keepAliveDuration methods:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;
import java.time.Duration;

HubSpotClient client = HubSpotOkHttpClient.builder()
    .fromEnv()
    // If `maxIdleConnections` is set, then `keepAliveDuration` must be set, and vice versa.
    .maxIdleConnections(10)
    .keepAliveDuration(Duration.ofMinutes(2))
    .accessToken("My Access Token")
    .build();

If both options are unset, OkHttp's default connection pool settings are used.

HTTPS

Note

Most applications should not call these methods, and instead use the system defaults. The defaults include special optimizations that can be lost if the implementations are modified.

To configure how HTTPS connections are secured, configure the client using the sslSocketFactory, trustManager, and hostnameVerifier methods:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;

HubSpotClient client = HubSpotOkHttpClient.builder()
    .fromEnv()
    // If `sslSocketFactory` is set, then `trustManager` must be set, and vice versa.
    .sslSocketFactory(yourSSLSocketFactory)
    .trustManager(yourTrustManager)
    .hostnameVerifier(yourHostnameVerifier)
    .accessToken("My Access Token")
    .build();

Custom HTTP client

The SDK consists of three artifacts:

This structure allows replacing the SDK's default HTTP client without pulling in unnecessary dependencies.

Customized OkHttpClient

Tip

Try the available network options before replacing the default client.

To use a customized OkHttpClient:

  1. Replace your hubspot-java dependency with hubspot-java-core
  2. Copy hubspot-java-client-okhttp's OkHttpClient class into your code and customize it
  3. Construct HubSpotClientImpl or HubSpotClientAsyncImpl, similarly to HubSpotOkHttpClient or HubSpotOkHttpClientAsync, using your customized client

Completely custom HTTP client

To use a completely custom HTTP client:

  1. Replace your hubspot-java dependency with hubspot-java-core
  2. Write a class that implements the HttpClient interface
  3. Construct HubSpotClientImpl or HubSpotClientAsyncImpl, similarly to HubSpotOkHttpClient or HubSpotOkHttpClientAsync, using your new client class

Undocumented API functionality

The SDK is typed for convenient usage of the documented API. However, it also supports working with undocumented or not yet supported parts of the API.

Parameters

To set undocumented parameters, call the putAdditionalHeader, putAdditionalQueryParam, or putAdditionalBodyProperty methods on any Params class:

import com.hubspot.sdk.core.JsonValue;
import com.hubspot.sdk.models.crm.objects.contacts.ContactGetParams;

ContactGetParams params = ContactGetParams.builder()
    .putAdditionalHeader("Secret-Header", "42")
    .putAdditionalQueryParam("secret_query_param", "42")
    .putAdditionalBodyProperty("secretProperty", JsonValue.from("42"))
    .build();

These can be accessed on the built object later using the _additionalHeaders(), _additionalQueryParams(), and _additionalBodyProperties() methods.

To set a documented parameter or property to an undocumented or not yet supported value, pass a JsonValue object to its setter:

import com.hubspot.sdk.models.crm.objects.contacts.ContactGetParams;

ContactGetParams params = ContactGetParams.builder().build();

The most straightforward way to create a JsonValue is using its from(...) method:

import com.hubspot.sdk.core.JsonValue;
import java.util.List;
import java.util.Map;

// Create primitive JSON values
JsonValue nullValue = JsonValue.from(null);
JsonValue booleanValue = JsonValue.from(true);
JsonValue numberValue = JsonValue.from(42);
JsonValue stringValue = JsonValue.from("Hello World!");

// Create a JSON array value equivalent to `["Hello", "World"]`
JsonValue arrayValue = JsonValue.from(List.of(
  "Hello", "World"
));

// Create a JSON object value equivalent to `{ "a": 1, "b": 2 }`
JsonValue objectValue = JsonValue.from(Map.of(
  "a", 1,
  "b", 2
));

// Create an arbitrarily nested JSON equivalent to:
// {
//   "a": [1, 2],
//   "b": [3, 4]
// }
JsonValue complexValue = JsonValue.from(Map.of(
  "a", List.of(
    1, 2
  ),
  "b", List.of(
    3, 4
  )
));

Normally a Builder class's build method will throw IllegalStateException if any required parameter or property is unset.

To forcibly omit a required parameter or property, pass JsonMissing:

import com.hubspot.sdk.core.JsonMissing;
import com.hubspot.sdk.models.crm.objects.contacts.ContactGetParams;

ContactGetParams params = ContactGetParams.builder()
    .contactId(JsonMissing.of())
    .build();

Response properties

To access undocumented response properties, call the _additionalProperties() method:

import com.hubspot.sdk.core.JsonValue;
import java.util.Map;

Map<String, JsonValue> additionalProperties = client.crm().objects().contacts().get(params)._additionalProperties();
JsonValue secretPropertyValue = additionalProperties.get("secretProperty");

String result = secretPropertyValue.accept(new JsonValue.Visitor<>() {
    @Override
    public String visitNull() {
        return "It's null!";
    }

    @Override
    public String visitBoolean(boolean value) {
        return "It's a boolean!";
    }

    @Override
    public String visitNumber(Number value) {
        return "It's a number!";
    }

    // Other methods include `visitMissing`, `visitString`, `visitArray`, and `visitObject`
    // The default implementation of each unimplemented method delegates to `visitDefault`, which throws by default, but can also be overridden
});

To access a property's raw JSON value, which may be undocumented, call its _ prefixed method:

import com.hubspot.sdk.core.JsonField;
import java.util.Optional;

JsonField<Object> field = client.crm().objects().contacts().get(params)._field();

if (field.isMissing()) {
  // The property is absent from the JSON response
} else if (field.isNull()) {
  // The property was set to literal null
} else {
  // Check if value was provided as a string
  // Other methods include `asNumber()`, `asBoolean()`, etc.
  Optional<String> jsonString = field.asString();

  // Try to deserialize into a custom type
  MyClass myObject = field.asUnknown().orElseThrow().convert(MyClass.class);
}

Response validation

In rare cases, the API may return a response that doesn't match the expected type. For example, the SDK may expect a property to contain a String, but the API could return something else.

By default, the SDK will not throw an exception in this case. It will throw HubSpotInvalidDataException only if you directly access the property.

Validating the response is not forwards compatible with new types from the API for existing fields.

If you would still prefer to check that the response is completely well-typed upfront, then either call validate():

import com.hubspot.sdk.models.crm.objects.SimplePublicObjectWithAssociations;

SimplePublicObjectWithAssociations result = client.crm().objects().contacts().get(params).validate();

Or configure the method call to validate the response using the responseValidation method:

import com.hubspot.sdk.models.crm.objects.SimplePublicObjectWithAssociations;

SimplePublicObjectWithAssociations result = client.crm().objects().contacts().get(RequestOptions.builder().responseValidation(true).build());

Or configure the default for all method calls at the client level:

import com.hubspot.sdk.client.HubSpotClient;
import com.hubspot.sdk.client.okhttp.HubSpotOkHttpClient;

HubSpotClient client = HubSpotOkHttpClient.builder()
    .fromEnv()
    .responseValidation(true)
    .accessToken("My Access Token")
    .build();

FAQ

Why don't you use plain enum classes?

Java enum classes are not trivially forwards compatible. Using them in the SDK could cause runtime exceptions if the API is updated to respond with a new enum value.

Why do you represent fields using JsonField<T> instead of just plain T?

Using JsonField<T> enables a few features:

Why don't you use data classes?

It is not backwards compatible to add new fields to a data class and we don't want to introduce a breaking change every time we add a field to a class.

Why don't you use checked exceptions?

Checked exceptions are widely considered a mistake in the Java programming language. In fact, they were omitted from Kotlin for this reason.

Checked exceptions:

  • Are verbose to handle
  • Encourage error handling at the wrong level of abstraction, where nothing can be done about the error
  • Are tedious to propagate due to the function coloring problem
  • Don't play well with lambdas (also due to the function coloring problem)

Semantic versioning

This package generally follows SemVer conventions, though certain backwards-incompatible changes may be released as minor versions:

  1. Changes to library internals which are technically public but not intended or documented for external use. (Please open a GitHub issue to let us know if you are relying on such internals.)
  2. Changes that we do not expect to impact the vast majority of users in practice.

We take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.

We are keen for your feedback; please open an issue with questions, bugs, or suggestions.

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