title: Configuration Reference
description: Environment variables, app settings, and server configuration options for JustAPI — a high-performance FastAPI alternative built in Rust.
keywords: configuration, environment variables, FastAPI alternative, Rust web framework, server settings
Environment Variables
| Variable |
Default |
Description |
RUST_LOG |
info |
Log level (error, warn, info, debug, trace) |
OTEL_SERVICE_NAME |
justapi |
Service name for OpenTelemetry |
OTEL_EXPORTER_OTLP_ENDPOINT |
— |
OTLP collector endpoint |
DATABASE_URL |
— |
Database connection string |
REDIS_URL |
— |
Redis connection string |
JWT_SECRET |
— |
JWT signing secret |
JustAPIApp() Constructor
app = JustAPIApp(
title="My API", # OpenAPI title
version="1.0.0", # OpenAPI version
description="...", # OpenAPI description
)
app.run() Parameters
app.run(
addr="127.0.0.1:8000", # Bind address
max_body_size=52428800, # Max body size (50 MiB)
)
Server CLI Flags
justapi serve --host 0.0.0.0 --port 8080 --workers 4 --timeout 30
| Flag |
Env Variable |
Default |
Description |
--host |
HOST |
127.0.0.1 |
Bind address |
--port |
PORT |
8000 |
Bind port |
--workers |
— |
CPU count |
Worker processes |
--timeout |
— |
30 |
Request timeout (seconds) |
--reload |
— |
false |
Hot-reload |
--unix |
— |
— |
Unix socket path |
Feature Flags (Cargo)
# Cargo.toml features for justapi-core
[dependencies]
justapi-core = { features = [
"tls", # TLS support via rustls
"ws", # WebSocket support
"compression", # Response compression
"opentelemetry", # OpenTelemetry tracing
"db", # Database support
"simd-json", # SIMD-accelerated JSON
] }
See Also