swagger-stats

swagger-stats

http://swaggerstats.io | Documentation | API DOC | API SPEC

Telemetry for your APIs

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

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}

Monitoring with Prometheus and Grafana

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

See dashboards/prometheus for swagger-stats Grafana dashboards

Embedded Monitoring

swagger-stats provides built-in Monitoring UI, so you may enable swagger-stats in your app, and start monitoring immediately, with no infrastructure requirements

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:

• CPU and Memory Usage of Node process
• 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 stats.
• Statistics by Request Method: baseline stats collected for each request method
• Timeline: baseline stats 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)
• Tracing: Request and Response details - method, URLs, parameters, request and response headers, addresses, start/stop times and processing duration, matched API Operation info
• API Statistics: baseline stats and parameter stats per each API Operation. API operation detected based on express routes, and based on Swagger (Open API) specification
• Metrics in Prometheus format, so you may use Prometheus and Grafana to setup API monitoring and alerting

How to Use

Install

npm install swagger-stats --save

Enable swagger-stats middleware in your app

var swStats = require('swagger-stats');
var apiSpec = require('swagger.json');
app.use(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

. . . . . . . . . .  

Embedded Monitoring User Interface

Swagger-stats comes with built-in User Interface. Navigate to /swagger-stats/ui in your app to start monitoring right away

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

Key metrics

Timeline

Request and error rates

API Operations

Stats By Method

Updates

v0.93.0

• [feature] Support providing Prometheus metrics via prom-client library #20

v0.92.0

• [feature] OnResponseFinish hook: pass request/response record to callback so app can post proceses it add it to the log #5

v0.91.0

• [feature] Option to specify alternative URI path for ui,stats and metrics #17

app.use(swStats.getMiddleware({
   uriPath: '/myservice',
   swaggerSpec:swaggerSpec
}));

$ curl http://<your app host:port>/myservice/stats

v0.90.3

• [feature] Added new chart to API Operation Page #16
  • handle time histogram
  • request size histogram
  • response size histogram
  • response codes counts

v0.90.2

• [feature] Added Prometheus metrics and Grafana dashboards #9

v0.90.1

• [feature] Added CPU and Memory Usage Stats and monitoring in UI #8

Enhancements and Bug Reports

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

License

MIT

Changelog

v0.93.0

• [feature] Support providing Prometheus metrics via prom-client library #20