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swagger-stats | API Observability

https://swaggerstats.io | Guide

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Trace API calls and Monitor API performance, health and usage statistics in Node.js Microservices

Express, Fastify, Koa, Hapi, Restify

swagger-stats traces REST API requests and responses in Node.js Microservices, and collects statistics per API Operation. swagger-stats detects API operations based on express routes. You may also provide Swagger (Open API) specification, and swagger-stats will match API requests with API Operations defined in swagger specification.

swagger-stats exposes statistics and metrics per API Operation, such as GET /myapi/:parameter, or GET /pet/{petId}

Built-In API Telemetry

swagger-stats provides built-in Telemetry UX, so you may enable swagger-stats in your app, and start monitoring immediately, with no infrastructure requirements. Navigate to http://<your app host:port>/swagger-stats/

swagger-stats Built-In Telemetry

API Analytics with Elasticsearch and Kibana

swagger-stats stores details about each request/response in Elasticsearch, so you may use Kibana to perform detailed analysis of API usage over time, build visualizations and dashboards

swagger-stats Kibana Dashboard

See dashboards/elastic6 for swagger-stats Kibana visualizations and dashboards

Monitoring and Alerting with Prometheus and Grafana

swagger-stats exposes metrics in Prometheus format, so you may use Prometheus and Grafana to setup API monitoring and alerting

swagger-stats Prometheus Dashboard

See dashboards/prometheus for swagger-stats Grafana dashboards

With statistics and metrics exposed by swagger-stats you may spot problematic API endpoints, see where most of errors happens, catch long-running requests, analyze details of last errors, observe trends, setup alerting.

swagger-stats provides:

How to Use

Install

npm install swagger-stats --save

If you haven't added prom-client already, you should do this now. It's a peer dependency of swagger-stats as of version 0.95.19.

npm install prom-client@12 --save

Enable swagger-stats middleware in your app

Express

const swStats = require('swagger-stats');
const apiSpec = require('swagger.json');
app.use(swStats.getMiddleware({swaggerSpec:apiSpec}));

Fastify

const swStats = require('swagger-stats');
const apiSpec = require('swagger.json');

const fastify = require('fastify')({
    logger: true
});

// Enable swagger-stats
fastify.register(require('fastify-express')).then(()=>{
    fastify.register(swStats.getFastifyPlugin, {swaggerSpec:apiSpec});
});

Koa

express-to-koa can be used which is just a simple Promise wrapper.

const swStats = require('swagger-stats');
const apiSpec = require('swagger.json');
const e2k = require('express-to-koa');
app.use(e2k(swStats.getMiddleware({ swaggerSpec:apiSpec })));

Hapi

const swStats = require('swagger-stats');
const swaggerSpec = require('./petstore.json');

const init = async () => {

    server = Hapi.server({
        port: 3040,
        host: 'localhost'
    });

    await server.register({
        plugin: swStats.getHapiPlugin,
        options: {
             swaggerSpec:swaggerSpec
        }
    });

    await server.start();
    console.log('Server running on %s', server.info.uri);
};

Restify

const restify = require('restify');
const swStats = require('swagger-stats');
const apiSpec = require('swagger.json');

const server = restify.createServer();

server.pre(swStats.getMiddleware({
    swaggerSpec:apiSpec,
}));

See /examples for sample apps

Get Statistics with API

$ curl http://<your app host:port>/swagger-stats/stats
{
  "startts": 1501647865959,
  "all": {
    "requests": 7,
    "responses": 7,
    "errors": 3,
    "info": 0,
    "success": 3,
    "redirect": 1,
    "client_error": 2,
    "server_error": 1,
    "total_time": 510,
    "max_time": 502,
    "avg_time": 72.85714285714286,
    "total_req_clength": 0,
    "max_req_clength": 0,
    "avg_req_clength": 0,
    "total_res_clength": 692,
    "max_res_clength": 510,
    "avg_res_clength": 98,
    "req_rate": 1.0734549915657108,
    "err_rate": 0.4600521392424475
  },
  "sys": {
    "rss": 59768832,
    "heapTotal": 36700160,
    "heapUsed": 20081776,
    "external": 5291923,
    "cpu": 0
  },
  "name": "swagger-stats-testapp",
  "version": "0.90.1",
  "hostname": "hostname",
  "ip": "127.0.0.1"
}

Take a look at Documentation for more details on API and returned statistics.

Get Prometheus Metrics

$ curl http://<your app host:port>/swagger-stats/metrics
# HELP api_all_request_total The total number of all API requests received
# TYPE api_all_request_total counter
api_all_request_total 88715
# HELP api_all_success_total The total number of all API requests with success response
# TYPE api_all_success_total counter
api_all_success_total 49051
# HELP api_all_errors_total The total number of all API requests with error response
# TYPE api_all_errors_total counter
api_all_errors_total 32152
# HELP api_all_client_error_total The total number of all API requests with client error response
# TYPE api_all_client_error_total counter
api_all_client_error_total 22986

. . . . . . . . . .

Default Metrics

To collect prom-client default metrics:

const swaggerStats = require('swagger-stats');
const promClient = require('prom-client');

promClient.collectDefaultMetrics();

Some Node.js specific metrics are included, such as event loop lag:

# HELP nodejs_eventloop_lag_seconds Lag of event loop in seconds.
# TYPE nodejs_eventloop_lag_seconds gauge
nodejs_eventloop_lag_seconds 0.000193641 1597303877464

. . . . . . . . . .

Updates

See Changelog

Enhancements and Bug Reports

If you find a bug, or have an enhancement in mind please post issues on GitHub.

License

MIT