Nagios is a family of open-source and commercial IT infrastructure monitoring tools, including Nagios Core (the original open-source monitoring engine), Nagios XI (the commercial enterprise distribution), Nagios Fusion, Nagios Log Server, and Nagios Network Analyzer, used to monitor hosts, services, networks, applications, and metrics with alerting and reporting. Nagios Core itself has no central HTTP API; Nagios XI ships a built-in REST API (typically reached at https://{nagios-xi-host}/nagiosxi/api/v1/) for reading, writing, deleting, and updating monitoring configuration and status. The Nagios XI API is authenticated via a per-user API key passed as a query parameter or header. Passive check results can also be submitted via NRDP (HTTP, JSON/XML) or NSCA (encrypted TCP, port 5667), and the NCPA cross-platform agent exposes a hierarchical REST API on port 5693.
APIs.json: https://raw.githubusercontent.com/api-evangelist/nagios/refs/heads/main/apis.yml
- Type: Index
- Monitoring
- Infrastructure Monitoring
- Network Monitoring
- Open Source
- IT Operations
- Alerting
- Observability
- Nagios XI
- Nagios Core
- NCPA
- NRPE
- NSCA
- NRDP
- Created: 2026-05-11
- Modified: 2026-05-23
Built-in REST API for Nagios XI. Split into three sections: Objects (read-only backend for hosts, services, host groups, contacts, downtime, history), Config (admin-only writes for hosts and services), and System (admin-only commands such as apply configuration, scheduled downtime, status). Responses are returned as JSON. Authentication uses a per-user Nagios XI API key passed via the apikey query parameter (or header). Custom endpoints can be added by creating a Nagios XI Component.
- Human URL: https://support.nagios.com/kb/article/nagios-xi-rest-api-176.html
- Base URL:
https://{nagios-xi-host}/nagiosxi/api/v1
- Monitoring
- REST
- Nagios XI
- IT Operations
- Documentation
- A P I P D F Guide
- Backend A P I
- Automated Host Management
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
- JSON Schema — JSON Schema
- JSON Schema — JSON Schema
- JSON Structure
- Spectral Rules
REST API exposed by the Nagios Cross-Platform Agent (NCPA), a cross-platform monitoring agent that runs on Linux, Windows, and macOS. Uses a hierarchical URL structure /api/{module}/{node1}/{node2} for CPU, memory, disk, interface, process, service, and plugin metrics. Both active polling and passive Nagios-style check results (check=1 + thresholds) are supported. Authenticated via a token query parameter matching the community_string in the agent config. Default TLS port 5693.
- Human URL: https://www.nagios.org/ncpa/help/3.x/api.html
- Base URL:
https://{ncpa-host}:5693/api
- Monitoring
- Agent
- REST
- NCPA
- Documentation
- Git Hub
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
- JSON Schema — JSON Schema
- Spectral Rules
PHP-based HTTP collector that accepts passive check results and external commands. Two commands are supported: submitcheck (host/service check results) and submitcmd (Nagios external command). Payloads can be sent as XML (XMLDATA) or JSON (JSONDATA) in a POST form. Authenticated by a token configured in config.inc.php with optional per-command deny mappings.
- Human URL: https://github.com/NagiosEnterprises/nrdp
- Base URL:
https://{nrdp-host}/nrdp
- Monitoring
- Passive Check
- REST
- NRDP
- Git Hub
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
- JSON Schema — JSON Schema
- JSON Structure
Encrypted binary TCP daemon (default port 5667) that accepts passive service/host check results from remote machines. Not REST — clients send tab-delimited records over a shared-secret-encrypted socket. Use NRDP for an HTTP/JSON equivalent.
- Human URL: https://github.com/NagiosEnterprises/nsca
- Base URL:
tcp://{nsca-host}:5667
- Monitoring
- Passive Check
- Binary Protocol
- NSCA
- Git Hub
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Daemon that runs Nagios plugins on a remote Linux/Unix host on TCP port 5666, returning the plugin's exit code and output to the Nagios server. Binary protocol, not REST.
- Human URL: https://github.com/NagiosEnterprises/nrpe
- Base URL:
tcp://{nrpe-host}:5666
- Monitoring
- Active Check
- Binary Protocol
- NRPE
- Git Hub
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
- Website
- Nagios X I Website
- Documentation
- Nagios Library
- Support Knowledgebase
- Pricing
- Downloads
- Nagios Exchange
- GitHub Organization
- Source Repo
- Source Repo
- Source Repo
- Source Repo
- Source Repo
- Source Repo
- Source Repo
- Python S D K
- SDK
- Prometheus Exporter
- Service Now Integration
- Pager Duty Integration
- V Mware Integration
- License
- Plans
- Vocabulary
- JSON-LD — JSON-LD
FN: Kin Lane Email: kin@apievangelist.com