swagger-stats

Monitor REST API performance, health and usage statistics in node express apps

swagger-stats monitors REST API requests and responses in node express apps and collects statistics. swagger-stats detects and monitors statistics for API operations based on express routes or Swagger specification. You may retrieve statistics using swagger-stats API, as well as you may monitor statistics using built-in UI front end. With data collected 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 in requests volumes.

swagger-stats collects:

• Counts of requests and responses(total and by response class), processing time (total/avg/max), content length(total/avg/max) for requests and responses, rates for requests and errors. This is baseline set of metrics.
• Statistics by Request Method: baseline metrics collected for each request method
• Timeline: baseline metrics collected for each 1 minute interval during last 60 minutes. Timeline helps you to analyze trends.
• Errors: count of responses per each error code, top "not found" resources, top "server error" resources
• Last errors: request and response details for the last 100 errors (last 100 error responses)
• Longest requests: request and response details for top 100 requests that took longest time to process (time to send response)
• API Statistics: baseline metrics per each API Operation. API operation is path and method combination from the swagger spec. Swagger specification is optional. swagger-stats will detect and monitor API operations based on express routes.
• API Operation parameters metrics: parameter passed count, mandatory parameter missing count (for API Operation parameters defined in swagger spec)

Install

npm install swagger-stats --save

Enable

var swStats = require('swagger-stats');

var app = module.exports = express();

var swaggerSpec = require('swagger.json');

// Enable swagger-stats middleware
app.use(swStats.getMiddleware({
    name: 'swagger-stats-testapp',
    version: '0.70.1',
    swaggerSpec:swaggerSpec
}));

See /examples

Monitor

$ curl http://<your app host:port>/swagger-stats/stats
{
  "startts": 1495174617959,
  "all": {
    "requests": 247,
    "responses": 246,
    "errors": 89,
    "info": 0,
    "success": 139,
    "redirect": 18,
    "client_error": 68,
    "server_error": 21,
    "total_time": 12601,
    "max_time": 100,
    "avg_time": 51.016194331983804,
    "total_req_clength": 12760,
    "max_req_clength": 209,
    "avg_req_clength": 51,
    "total_res_clength": 25361,
    "max_res_clength": 200,
    "avg_res_clength": 102,
    "req_rate": 1.8788726763941634,
    "err_rate": 0.6715970417749351
  },
  "name": "swagger-stats-testapp",
  "version": "0.70.1",
  "nodehostname": "hostname",
  "nodename": "node-1",
  "nodeaddress": "127.0.0.1"
}

Get more statistics:

$ curl http://<host:port>/swagger-stats/stats?fields=method
$ curl http://<host:port>/swagger-stats/stats?fields=timeline
$ curl http://<host:port>/swagger-stats/stats?fields=lasterrors
$ curl http://<host:port>/swagger-stats/stats?fields=longestreq
$ curl http://<host:port>/swagger-stats/stats?fields=apidefs
$ curl http://<host:port>/swagger-stats/stats?fields=apistats
$ curl http://<host:port>/swagger-stats/stats?fields=errors

Get exactly what you need:

$ curl http://<host:port>/swagger-stats/stats?fields=method,timeline
$ curl http://<host:port>/swagger-stats/stats?fields=lasterrors,longestreq
$ curl http://<host:port>/swagger-stats/stats?fields=apiop&method=GET&path=/v2/pet/{petId}
$ curl http://<host:port>/swagger-stats/stats?fields=all
$ curl http://<host:port>/swagger-stats/stats?fields=*

User Interface

http://<your app host:port>/swagger-stats/ui