JavaScript Client

Whilst you can use any of the multitude of Ajax libraries to consume ServiceStack's pure JSON REST APIs, leveraging the integrated TypeScript support still offers the best development UX for calling ServiceStack's JSON APIs in JavaScript where you can use the TypeScript JsonServiceClient with TypeScript Add ServiceStack Reference DTO's to get the same productive end-to-end Typed APIs available in ServiceStack's Typed .NET Clients, e.g:

let client = new JsonServiceClient(baseUrl);

client.get(new Hello({ Name: 'World' }))
  .then(r => console.log(r.Result));

Using JavaScript Typed DTOs in Web Apps

To get started quickly you can use the init mix gist to create an empty .NET project:

$ mkdir ProjectName && cd ProjectName
$ x mix init

That uses the built-in @servicestack/client library's JsonServiceClient in a dependency-free Web Page:

With a single command you can update your App's TypeScript DTOs, compile them to JavaScript & move them to /wwwroot:

$ npm run dtos

To use them in your Web Page create a basic UMD loader and include the UMD @servicestack/client library & dtos.js:

  var exports = { __esModule:true }, module = { exports:exports }
  function require(name) { return exports[name] || window[name] }
<script src="/js/servicestack-client.js"></script>
<script src="/dtos.js"></script>

We can then import the library and DTO types in the global namespace to use them directly:

Object.assign(window, exports) //import

var client = new JsonServiceClient()
client.get(new Hello({ name: name }))
    .then(function(r) {

Rich intelli-sense support

Even pure HTML/JS Apps that don't use TypeScript or any external dependencies will still benefit from the Server generated dtos.ts and servicestack-client.d.ts definitions as Smart IDEs like Rider can make use of them to provide a rich productive development UX on both the built-in /js/servicestack-client.js library:

As well as your App's server generated DTOs:

Including their typed partial constructors:

So even simple Apps without complex bundling solutions or external dependencies can still benefit from a rich typed authoring experience without any additional build time or tooling complexity.

CDN Resources

An CDN alternative to using the @servicestack/client built into ServiceStack.dll is to reference it from

If needed for IDE intelli-sense, the TypeScript definition for the @servicestack/client is available from:

The npm-free Vue and React lite Templates are some examples that makes use of the stand-alone @servicestack/client libraries.

Using TypeScript JsonServiceClient in npm projects

The /@servicestack/client follows the recommended guidance for TypeScript modules which doesn't bundle any TypeScript .ts source files, just the generated index.js and index.d.ts Type definitions which can be imported the same way in both JavaScript and TypeScript npm projects as any other module, e.g:

import { JsonServiceClient } from "@servicestack/client";

Which can then be used with the generated DTOs from your API at /types/typescript that can either be downloaded and saved to a local file e.g. dtos.ts or preferably downloaded using the x dotnet tool to download the DTOs of a remote ServiceStack API with:

$ dotnet tool install --global x 
$ x typescript

For JavaScript projects that haven't configured transpilation of TypeScript, you'll need to use TypeScript to generate the dtos.js JavaScript version which can be used instead:

$ tsc dtos.ts 

Use the --module compiler flag if needing to generate a specific module version, e.g:

$ tsc -m ES6 dtos.ts

The generated dtos.js can then be used with the JsonServiceClient to provide a succinct Typed API:

import { GetConfig } from './dtos';

let client = new JsonServiceClient('/');

let response = await client.get(new GetConfig());

Updating DTOs

To update your generated DTOs when your server API changes, run x typescript or its shorter x ts alias without any arguments:

$ x ts

Which will update to the latest version of dtos.ts. This can be easily automated with an [npm script][5], e.g:

  "scripts": {
    "dtos": "cd path/to/dtos && x ts && tsc -m ES6 dtos.ts",

Which will let you update and compile the dtos with:

$ npm run dtos

The [TechStacks][6] (Vue/Nuxt) and [React Native Mobile App][7] (React) are examples of JavaScript-only projects using the TypeScript JsonServiceClient in this way.

jQuery JsonServiceClient

We also provide our older jQuery JsonServiceClient which mimics the .NET Clients in functionality that we make use of in our Redis Admin UI and suitable for use when needing to support older browsers without W3C's fetch or a polyfill:

Although most dynamic languages like JavaScript already include support for HTTP and JSON where in most cases it's easier to just use the libraries already provided. Here are a couple of examples from Backbones Todos and Redis StackOverflow that uses jQuery to talk to back-end ServiceStack JSON services:

Using jQuery Ajax APIs:

$.getJSON("http://localhost/Backbone.Todo/todos", function(todos) {
    alert(todos.length == 1);

$.post("questions", { 
  UserId: authUser.Id, Title: title, Content: body, Tags: dtoTags 
}, refresh);

JSV Service Client

In our pursuit to provide the fastest end-to-end communication we've also developed a JsvServiceClient in JavaScript that uses the fast JSV Format:

JSV is marginally faster than safe JSON in modern browsers (marginally slower than Eval) but because of the poor JS and String Performance in IE7/8 it performs over 20x slower than IE's native eval().