Newsdata.io .NET SDK

Official .NET client (SDK) for the Newsdata.io News API. Async methods for every endpoint (latest, archive, sources, crypto, market, count, crypto/count, market/count) with client-side parameter validation, retries with exponential backoff, IAsyncEnumerable-based pagination, and a typed exception hierarchy.

Built on .NET 8's HttpClient and System.Text.Json — zero runtime dependencies. Thread-safe.

Installation

dotnet add package Newsdata.Api

Or csproj:

<PackageReference Include="Newsdata.Api" Version="0.0.1" />

Quickstart

using Newsdata.Api;
using Newsdata.Api.Exceptions;

using var client = new NewsDataApiClient(
    Environment.GetEnvironmentVariable("NEWSDATA_API_KEY")!);

var resp = await client.LatestAsync(Params.Of()
    .With("q", "bitcoin")
    .With("country", new[] { "us", "gb" })
    .With("language", new[] { "en" }));

foreach (var article in resp.GetArticles())
{
    Console.WriteLine($"{article.Title} — {article.Link}");
}

Endpoints

Method	Endpoint	Notes
client.LatestAsync(params)	/1/latest	Real-time news
client.ArchiveAsync(params)	/1/archive	Historical news
client.SourcesAsync(params)	/1/sources	Available sources (single page)
client.CryptoAsync(params)	/1/crypto	Cryptocurrency news
client.MarketAsync(params)	/1/market	Market / financial news
client.CountAsync(params)	/1/count	Aggregate counts (requires from_date, to_date)
client.CryptoCountAsync(params)	/1/crypto/count	Aggregate crypto counts
client.MarketCountAsync(params)	/1/market/count	Aggregate market counts

params is IDictionary<string, object?> — pass a Params instance for fluent construction. Values may be string, int, double, bool, or IEnumerable<string> (sent comma-joined). Parameter names are case-insensitive — qInTitle and qintitle are equivalent.

Every method accepts an optional CancellationToken as the last argument.

Pagination

// 1) ScrollAllAsync: follow nextPage cursors and return one merged response.
var all = await client.ScrollAllAsync(
    Endpoint.Latest,
    Params.Of().With("q", "news"),
    maxResults: 200);   // 0 = no cap

// 2) Paginate: idiomatic IAsyncEnumerable.
await foreach (var page in client.Paginate(
    Endpoint.Latest, Params.Of().With("q", "news")))
{
    foreach (var article in page.GetArticles())
        Process(article);
}

Use break (or a cancelled CancellationToken) to stop the await foreach early.

Raw query

await client.LatestAsync(Params.Of()
    .With("rawQuery", "q=bitcoin&country=us&language=en"));

rawQuery is mutually exclusive with every other parameter and is parsed and validated against the endpoint's allowed keys before the request leaves.

Client-side validation

A NewsdataValidationException is thrown — before any HTTP request — when:

• a parameter is not accepted by that endpoint;
• mutually-exclusive parameters are set together — q/qInTitle/qInMeta, country/excludecountry, category/excludecategory, language/excludelanguage, domain/domainurl/excludedomain;
• size is outside 1–50;
• sentiment_score is set without sentiment;
• a count endpoint is missing from_date or to_date.

Booleans for full_content, image, video, and removeduplicate are coerced to "1"/"0".

Error handling

using Newsdata.Api.Exceptions;

try
{
    await client.LatestAsync(Params.Of().With("q", "news"));
}
catch (NewsdataValidationException e) { /* bad param — e.Param */ }
catch (NewsdataAuthException e)       { /* 401 / 403 */ }
catch (NewsdataRateLimitException e)  { /* 429 — e.RetryAfter */ }
catch (NewsdataServerException e)     { /* 5xx */ }
catch (NewsdataApiException e)        { /* other API errors — e.StatusCode */ }
catch (NewsdataNetworkException e)    { /* transport — e.InnerException */ }

Hierarchy:

NewsdataException (extends Exception)
├── NewsdataValidationException             (.Param)
├── NewsdataApiException                    (.StatusCode, .ResponseBody)
│   ├── NewsdataAuthException               (401 / 403)
│   ├── NewsdataRateLimitException          (429; .RetryAfter)
│   └── NewsdataServerException             (5xx)
└── NewsdataNetworkException                (.InnerException)

Configuration

using var client = new NewsDataApiClient(new NewsDataApiClientOptions
{
    ApiKey = apiKey,
    Timeout = TimeSpan.FromSeconds(30),
    MaxRetries = 5,
    RetryBackoff = TimeSpan.FromSeconds(2),
    RetryBackoffMax = TimeSpan.FromSeconds(60),
    PaginationDelay = TimeSpan.FromSeconds(1),
    BaseUrl = "https://staging.example/api/1/",
    IncludeHeaders = true,
    HttpClient = myInjectedClient,     // proxies, mTLS, etc.
    Logger = (level, msg) => Console.WriteLine($"{level}: {msg}"),
});

Retries cover network errors, HTTP 429, and 5xx. 429 honours the Retry-After header (integer seconds or HTTP-date); otherwise backoff is exponential. Auth (401/403) and other 4xx errors are never retried. The API key is redacted from any URL passed to the logger.

Concurrency

NewsDataApiClient is thread-safe — share one instance across your application. Dispose it on shutdown (or use using var); the SDK only disposes the underlying HttpClient if it created it.

Development

dotnet build
dotnet test                        # 33 tests, no API key needed
dotnet pack -c Release             # produces .nupkg + .snupkg

Tests use a custom HttpMessageHandler mock — no WireMock, no network, no external test dep.

Releasing

Tag-push driven. Bump <Version> in src/Newsdata.Api/Newsdata.Api.csproj, push a v-prefixed tag, and publish.yml does the rest:

git tag -a v0.0.2 -m "v0.0.2"
git push origin v0.0.2

See .github/workflows/publish.yml for the NuGet.org publishing flow.

License

MIT