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Connect GraphQL and Clickhouse in our serverless environment

Use this template to Read a JSON array from one GraphQL API using them to insert rows into Clickhouse table.


Read a JSON array from one GraphQL API

Used integrations:
class GraphqlSourceQuery {
async init() {
// TODO: Create your graphql credential
// More info at
this.graphQLClient = yepcode.integration.graphql(

async fetch(publish, done) {
// TODO: Customize your graphql query
await this.graphQLClient
query yourQueryName($someParam: Number!) {
yourQueryName(someParam: $someParam) {
`, {
someParam: 10
.then(async (data) => {
// publish each JSON object in array
for (const item of data) {
await publish(item);

async close() {}

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Insert rows into Clickhouse table

Used integrations:
class ClickhouseTargetInsert {
async init() {
// TODO: Create your clickhouse credential
// More info at
this.clickhouse = yepcode.integration.clickhouse(
// TODO: customize your sql query
// This opens insert stream for your table = new Stream.Readable({
objectMode: true
}); = client.insert({
table: "your_table_name",
values: stream,
format: "JSONCompactEachRow",

async consume(item) {
// TODO: Map your item to row;

async close() {
// wait stream to finish;
await this.clickhouse.close();

Other combinations

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