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Call the Cloud Natural Language API from Node.js
'use strict';
const fs = require('fs');
const ndjson = require('ndjson');
const request = require('request');
fs.createReadStream('reddit-comments.json') // Newline delimited JSON file
.on('data', function(obj) {
let text = obj.body;
let nlRequestUri = "";
let nlReq = {
"document": {
"content": text,
"type": "PLAIN_TEXT"
"features": {
"extractSyntax": true,
"extractEntities": true,
"extractDocumentSentiment": true
let reqOptions = {
url: nlRequestUri,
method: "POST",
body: nlReq,
json: true
request(reqOptions, function(err, resp, respBody) {
if (!err && resp.statusCode == 200) {
if (respBody.language === 'en') {
let row = {
sentiment_score: respBody.documentSentiment.score,
magnitude: respBody.documentSentiment.magnitude,
entities: respBody.entities,
tokens: respBody.tokens,
text: text,
comment_score: parseInt(obj.score),
created: obj.date_posted
// Newline delimited JSON because that's the format we need to upload to BigQuery
fs.appendFileSync('output.json', JSON.stringify(row) + '\n');
} else {
console.log('nl api error err', resp);

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commented Nov 17, 2018

Sara, I can't make it work when it comes to access the API from node js. It seems that I am taking a wrong "YOUR_API_KEY". Can you help me understand how to get it?

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