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
5 Answers
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();
});
}
Comments
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);
}
});
2 Comments
Avinash Dalvi
I tried this in lambda but doesn't work for me. where as same rest api work in postman and python script also.
Sreejith Sree
Using this how we can pass the body data of the POST API? Also how we can parse the response of the service?
AWS Lambda now supports Node.js 18 ,which has support for global fetch , you can now easily call the REST api endpoints like this
// index.mjs
export const handler = async(event) => {
const res = await fetch('https://nodejs.org/api/documentation.json');
if (res.ok) {
const data = await res.json();
console.log(data);
}
const response = {
statusCode: 200,
body: JSON.stringify('Hello from Lambda!'),
};
return response;
};
Comments
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) => {
...
});
})
}
Comments
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.
lambda functionand call rest api using nodejs.