how to call rest api inside aws lambda function using nodejs

Question

i have created aws lambda function. i want to use rest api calls inside my lambda function. Is there any reference how to connect it to rest api using nodejs

Answer 1

If you want to call rest api inside lambda function, you can use request package:

install request package via npm: https://www.npmjs.com/package/request

Then inside lambda function try this to call rest api:

    var req = require('request');
    const params = {
        url: 'API_REST_URL',
        headers: { 'Content-Type': 'application/json' },
        json: JSON.parse({ id: 1})
    };
    req.post(params, function(err, res, body) {
        if(err){
            console.log('------error------', err);
        } else{
            console.log('------success--------', body);
        }
    });

Answer 2

 const https = require('https') // data for the body you want to send. const data = JSON.stringify({ todo: 'Cook dinner.' }); const options = { hostname: 'yourapihost.com', port: 443, path: '/todos', method: 'POST', headers: { 'Content-Type': 'application/json', 'Content-Length': data.length }, }; const response = await doRequest(options, data); console.log("response", JSON.stringify(response)); /** * Do a request with options provided. * * @param {Object} options * @param {Object} data * @return {Promise} a promise of request */ function doRequest(options, data) { return new Promise((resolve, reject) => { const req = https.request(options, (res) => { res.setEncoding("utf8"); let responseBody = ""; res.on("data", (chunk) => { responseBody += chunk; }); res.on("end", () => { resolve(JSON.parse(responseBody)); }); }); req.on("error", (err) => { reject(err); }); req.write(data); req.end(); }); }

Answer 3

const superagent = require('superagent');

exports.handler =  async(event) => {
    return await startPoint();  // use promise function for api 
}


function startPoint(){
    return new Promise(function(resolve,reject){
    superagent
    .get(apiEndPoint)
    .end((err, res) => {
        ...



       });
    })
}

Answer 4

If you are asking about creating a HTTP rest endpoint in lambda using nodejs. Here is the example. https://github.com/serverless/examples/tree/master/aws-node-simple-http-endpoint

If you are asking about access an external API inside lambda using nodejs. Here is an example.

https://github.com/robm26/SkillsDataAccess/blob/master/src/CallService/index.js

Hope this helps.