Fetch data

GET requests

To make a GET request use Amplify.API.get:

Future<void> getTodo() async {
    final restOperation = Amplify.API.get('todo');
    final response = await restOperation.response;
    print('GET call succeeded: ${response.decodeBody()}');
  } on ApiException catch (e) {
    print('GET call failed: $e');

Accessing query parameters & body in Lambda proxy function

To learn more about Lambda Proxy Integration, please visit Amazon API Gateway Developer Guide.

If you are using a REST API which is generated with Amplify CLI, your backend is created with Lambda Proxy Integration, and you can access your query parameters & body within your Lambda function via the event object:

exports.handler = function(event, context, callback) {
    console.log(event.queryStringParameters);
    console.log('body: ', event.body);

In case you do not have it already, alternatively, you can update your backend file which is located at amplify/backend/function/[your-lambda-function]/src/app.js with the middleware:

const awsServerlessExpressMiddleware = require('aws-serverless-express/middleware');
app.use(awsServerlessExpressMiddleware.eventContext());

Accessing Query Parameters with Serverless Express

In your request handler use req.apiGateway.event or req.query:

app.get('/todo', function(req, res) {
  const query = req.query;
  // const query = req.apiGateway.event.queryStringParameters
  res.json({
    event: req.apiGateway.event, // to view all event data
    query: query

Then you can use query parameters in your path as follows:

Future<void> getTodo() async {
    final restOperation = Amplify.API.get(
      'todo',
      queryParameters: {'q': 'test'},
    final response = await restOperation.response;
    print('GET call succeeded: ${response.decodeBody()}');
  } on ApiException catch (e) {
    print('GET call failed: $e');

Set up Amplify REST API

Update data