Client libraries overview

Overview of QuestDB client libraries for data ingestion

QuestDB provides official client libraries for multiple programming languages to ingest data using the InfluxDB Line Protocol (ILP). These clients are optimized for high-throughput, low-latency ingestion.

Available clients

Java

io.questdb.client.Sender for JVM applications

Python

questdb.ingress.Sender for Python applications

Node.js

@questdb/nodejs-client for JavaScript/TypeScript

Go

questdb-client-go for Go applications

Rust

questdb-rs for Rust applications

C/C++

line_sender API for C/C++ applications

.NET

QuestDB.Net for .NET applications

Comparison

Language	Package	Protocol	Transport	Authentication
Java	io.questdb.client:questdb-client	ILP	TCP/HTTP	✓
Python	questdb	ILP	TCP/HTTP	✓
Node.js	@questdb/nodejs-client	ILP	TCP/HTTP	✓
Go	github.com/questdb/go-questdb-client	ILP	TCP/HTTP	✓
Rust	questdb-rs	ILP	TCP	✓
C/C++	questdb.h	ILP	TCP/HTTP	✓
.NET	QuestDB.Net	ILP	TCP	✓

Features

All clients support:

• Auto-flush: Automatic batching and flushing
• Error handling: Comprehensive error reporting
• Type safety: Strong typing for fields and timestamps
• Authentication: Elliptic curve authentication
• Connection pooling: Efficient connection management

Default configuration

• Host: localhost
• Port: 9009 (TCP), 9000 (HTTP)
• Auto-flush: Enabled (varies by client)
• Buffer size: 64KB-128KB (varies by client)

Choosing a client

High throughput

Use Java or C/C++ clients for maximum performance (millions of rows/second).

Ease of use

Use Python or Node.js clients for rapid development and integration.

Systems programming

Use Rust or C/C++ clients for embedded systems or low-level control.

Next steps

Installation

Install your preferred client library

ILP Reference

Learn about the InfluxDB Line Protocol