chopper 3.0.1+1

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  • Changelog
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Chopper is an http client generator using source_gen and inspired by Retrofit.

Usage #

Generator #

Add the generator to your dev dependencies

  chopper: ^[latest version]

  build_runner: ^[latest version]
  chopper_generator: ^[latest version]

Define and Generate your API #

// my_service.dart

import "dart:async";
import 'package:chopper/chopper.dart';

part "my_service.chopper.dart";

@ChopperApi(baseUrl: "/resources")
abstract class MyService extends ChopperService {
  static MyService create([ChopperClient client]) => _$MyService(client);

  @Get(path: "{id}")
  Future<Response> getResource(@Path() String id);

  @Get(headers: const {"foo": "bar"})
  Future<Response<Map>> getMapResource(@Query() String id);

  @Post(path: 'multi')
  Future<Response> postResources(
    @Part('1') Map a,
    @Part('2') Map b,
    @Part('3') String c,

  @Post(path: 'file')
  Future<Response> postFile(
    @PartFile('file') List<int> bytes,

then run the generator

pub run build_runner build

flutter packages pub run build_runner build

Use it #

final chopper = ChopperClient(
    baseUrl: "http://localhost:8000",
    services: [
      // the generated service
    converter: JsonConverter(),

final myService = MyService.create(chopper);

final response = await myService.getMapResource("1");


Or create a Chopper client and inject your generated api.

import 'package:chopper/chopper.dart';

final chopper = new ChopperClient(
    baseUrl: "http://localhost:8000",
    services: [
      // the generated service
    converter: JsonConverter(),

final myService = chopper.service<MyService>(MyService);

Interceptors #

Request #

implement RequestInterceptor class or define function with following signature FutureOr<Request> RequestInterceptorFunc(Request request)

Request interceptor are called just before sending request

final chopper = new ChopperClient(
   interceptors: [
     (request) async => request.replace(body: {}),

Response #

implement ResponseInterceptor class or define function with following signature FutureOr<Response> ResponseInterceptorFunc(Response response)

Called after successfull or failed request

final chopper = new ChopperClient(
   interceptors: [
     (response) async => response.replace(body: {}),

Converter #

Converter is used to transform body, for example transforming a Dart object to a Map<String, dynamic>

Both converter and errorConverter are called before request and response intercptors.

errorConverter is called only on error response (statusCode < 200 || statusCode >= 300)

final chopper = new ChopperClient(
   converter: MyConverter(),
   errorConverter: MyErrorConverter()

More example #

Issue Tracker #

Changelog #

3.0.1+1 #

  • Documentations update

3.0.1 #

  • ResponseInterceptor function support typed parameter
  • Fix JsonConverter when converting core types

3.0.0 #

Breaking change New way to handle errors if (response.isSuccessful) { final body = response.body; } else { final error = response.error; }

  • Fix error handling by introducing Response.error getter
  • Remove onError since every response are available via onResponse stream

2.5.0 #

  • Unsuccessful response are not throw anymore, use Response.isSuccessful getter or statusCode instead
  • Support HEAD request

2.4.2 #

  • Fix on JsonConverter If content type header overrided using @Post(headers: {'content-type': '...'}) The converter won't add json header and won't apply json.encode if content type is not JSON

  • add bool override on applyHeader(s) functions, true by default

  • support List<MultipartFile>

2.4.1 #

  • Deprecate @FieldField, use @PartFile instead

2.4.0 #

  • Breaking Change Response.base is now a BaseRequest instead of a Request, which means that you can't do base.body now. Please use Response.bodyBytes or Response.bodyString instead for non streaming case.
  • Now supports streams !
    • You can pass Stream<List<int>> as a body to a request
    • You can also use Stream<List<int>> as the BodyType for the response, in this case the returned response will contain a stream in body.
  • Support passing MutlipartFile (from packages:http) directly to @FileField annotation

2.3.2 #

  • Fix trailing slash when path empty

2.3.1 #

  • Default value for a path is now '' instead of '/'
  • Do not send null value for Multipart request

2.3.0 #

2.2.0 #

  • Fix converter issue on List

    • Breaking Change on Converter.convertResponse<ResultType>(response), it take a new generic type => Converter.convertResponse<ResultType, ItemType>(response)
  • deprecated Chopper.service<Type>(Type), use Chopper.getservice<Type>() instead thanks to @MichaelDark

2.1.0 #

  • fix casting issue

2.0.0 #

  • Fix type safety
  • Fix json converter
  • Handle BuiltList

2.0.0 #

  • Request is now containing baseUrl

  • Can call Request.toHttpRequest() direclty to get the http.BaseRequest will receive

  • If a full url is specified in the path (ex: @Get(path: 'https://...')), it won't be concaten with the baseUrl of the ChopperClient and the ChopperAPI

  • Add CurlInterceptor thanks @edwardaux

  • Add HttpLoggingInterceptor

  • Add FactoryConverter annotation @FactoryConverter(request: convertRequest, response: convertResponse)

  • BreakingChange

    • Method.url renamed to path
    • Converter.encode and Converter.decode removed, implement Converter.convertResponse and Converter.convertRequest` instead
    • ChopperClient.jsonApi deprecated, use a JsonConverter instead
    • ChopperClient.formUrlEncodedApi, use FormUrlEncodedConverter instead
    • remove JsonEncoded annotation, use FactoryConverter instead

1.1.0 #

  • BreakingChange Removed name parameter on ChopperApi New way to instanciate a service

      abstract class MyService extends ChopperService {
          static MyService create([ChopperClient client]) => _$MyService(client);

1.0.0 #

  • Multipart request
  • form url encoded
  • add jsonAPI and formUrlEncodedApi boolean to ChopperClient
  • json and formUrlEncoding are now builtin
  • onError, onResponse, onRequest stream
  • error converter
  • add withClient constructor

0.1.1 #

  • Remove trimSlashes

0.1.0 #

  • update dart sdk

0.0.2 #

  • the generated extension is now *.chopper.dart

  • rename ServiceDefinition to ChopperApi

  • rename field to ChopperClient.apis

0.0.1 #

  • Initial version, created by Stagehand


import 'package:chopper/chopper.dart';
import 'package:chopper/src/interceptor.dart';
import 'definition.dart';

Future<void> main() async {
  final chopper = ChopperClient(
    baseUrl: 'http://localhost:8000',
    services: [
      // the generated service
    converter: JsonConverter(),

  final myService = chopper.getService<MyService>();

  final response = await myService.getMapResource('1');

  final list = await myService.getListResources();


Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  chopper: ^3.0.1+1

2. Install it

You can install packages from the command line:

with pub:

$ pub get

with Flutter:

$ flutter pub get

Alternatively, your editor might support pub get or flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:chopper/chopper.dart';
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Learn more about scoring.

We analyzed this package on Jan 27, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.0
  • pana: 0.13.4


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
http >=0.11.0 <1.0.0 0.12.0+4
logging ^0.11.3 0.11.4
meta ^1.1.2 1.1.8
Transitive dependencies
async 2.4.0
charcode 1.1.2
collection 1.14.12
path 1.6.4
source_span 1.6.0
string_scanner 1.0.5
term_glyph 1.1.0
typed_data 1.1.6
Dev dependencies
build_runner ^1.0.0
build_test any
coverage ^0.12.2
http_parser ^3.1.3 3.1.3
pedantic ^1.0.0 1.9.0
test ^1.3.0
test_coverage ^0.3.0