Fastify · Schema

Fastify Plugin and Server Configuration

JSON Schema for Fastify server instance options and plugin configuration patterns.

FrameworksHigh PerformanceJavaScriptJSON-SchemaNode.jsTypeScript

Properties

Name	Type	Description
logger	object	Logger configuration (Pino).
ajv	object	Ajv (JSON Schema validator) configuration.
http2	boolean	Enable HTTP/2 support.
https	object	HTTPS/TLS configuration.
connectionTimeout	integer	Connection timeout in milliseconds.
keepAliveTimeout	integer	Keep-alive timeout in milliseconds.
maxParamLength	integer	Maximum parameter length for URL params.
bodyLimit	integer	Default maximum body size in bytes.
caseSensitive	boolean	Case-sensitive routing.
ignoreTrailingSlash	boolean	Ignore trailing slashes in routes.
ignoreDuplicateSlashes	boolean	Ignore duplicate slashes in routes.
disableRequestLogging	boolean	Disable automatic request logging.
requestIdHeader	string	Header name to use for request ID.
requestIdLogLabel	string	Label for request ID in logs.
pluginTimeout	integer	Plugin load timeout in milliseconds.
forceCloseConnections	object	Force close connections on server close.
trustProxy	object	Trust proxy configuration.
return503OnClosing	boolean	Return 503 when server is closing.

View JSON Schema on GitHub

JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/api-evangelist/fastify/json-schema/fastify-plugin-config.json",
  "title": "Fastify Plugin and Server Configuration",
  "description": "JSON Schema for Fastify server instance options and plugin configuration patterns.",
  "type": "object",
  "properties": {
    "logger": {
      "description": "Logger configuration (Pino).",
      "oneOf": [
        { "type": "boolean" },
        {
          "type": "object",
          "properties": {
            "level": {
              "type": "string",
              "enum": ["trace", "debug", "info", "warn", "error", "fatal", "silent"],
              "default": "info"
            },
            "prettyPrint": {
              "type": "boolean",
              "description": "Enable pretty printing (dev only).",
              "default": false
            },
            "serializers": {
              "type": "object",
              "description": "Custom serializers for log fields.",
              "additionalProperties": true
            },
            "redact": {
              "type": "array",
              "description": "Paths to redact from logs.",
              "items": {
                "type": "string"
              }
            },
            "file": {
              "type": "string",
              "description": "Log output file path."
            },
            "transport": {
              "type": "object",
              "description": "Pino transport configuration.",
              "properties": {
                "target": {
                  "type": "string"
                },
                "options": {
                  "type": "object",
                  "additionalProperties": true
                }
              },
              "additionalProperties": true
            }
          },
          "additionalProperties": true
        }
      ]
    },
    "ajv": {
      "type": "object",
      "description": "Ajv (JSON Schema validator) configuration.",
      "properties": {
        "customOptions": {
          "type": "object",
          "description": "Custom Ajv options.",
          "properties": {
            "removeAdditional": {
              "type": "boolean",
              "default": false
            },
            "useDefaults": {
              "type": "boolean",
              "default": true
            },
            "coerceTypes": {
              "type": "boolean",
              "default": true
            },
            "allErrors": {
              "type": "boolean",
              "default": false
            }
          },
          "additionalProperties": true
        },
        "plugins": {
          "type": "array",
          "description": "Ajv plugins to load.",
          "items": {
            "type": "string"
          }
        }
      },
      "additionalProperties": true
    },
    "http2": {
      "type": "boolean",
      "description": "Enable HTTP/2 support.",
      "default": false
    },
    "https": {
      "type": "object",
      "description": "HTTPS/TLS configuration.",
      "properties": {
        "key": {
          "type": "string",
          "description": "Path to TLS private key or key contents."
        },
        "cert": {
          "type": "string",
          "description": "Path to TLS certificate or certificate contents."
        },
        "allowHTTP1": {
          "type": "boolean",
          "description": "Allow HTTP/1.1 fallback with HTTP/2.",
          "default": true
        }
      },
      "additionalProperties": true
    },
    "connectionTimeout": {
      "type": "integer",
      "description": "Connection timeout in milliseconds.",
      "default": 0
    },
    "keepAliveTimeout": {
      "type": "integer",
      "description": "Keep-alive timeout in milliseconds.",
      "default": 72000
    },
    "maxParamLength": {
      "type": "integer",
      "description": "Maximum parameter length for URL params.",
      "default": 100
    },
    "bodyLimit": {
      "type": "integer",
      "description": "Default maximum body size in bytes.",
      "default": 1048576
    },
    "caseSensitive": {
      "type": "boolean",
      "description": "Case-sensitive routing.",
      "default": true
    },
    "ignoreTrailingSlash": {
      "type": "boolean",
      "description": "Ignore trailing slashes in routes.",
      "default": false
    },
    "ignoreDuplicateSlashes": {
      "type": "boolean",
      "description": "Ignore duplicate slashes in routes.",
      "default": false
    },
    "disableRequestLogging": {
      "type": "boolean",
      "description": "Disable automatic request logging.",
      "default": false
    },
    "requestIdHeader": {
      "type": "string",
      "description": "Header name to use for request ID.",
      "default": "request-id"
    },
    "requestIdLogLabel": {
      "type": "string",
      "description": "Label for request ID in logs.",
      "default": "reqId"
    },
    "pluginTimeout": {
      "type": "integer",
      "description": "Plugin load timeout in milliseconds.",
      "default": 10000
    },
    "forceCloseConnections": {
      "description": "Force close connections on server close.",
      "oneOf": [
        { "type": "boolean" },
        { "type": "string", "const": "idle" }
      ],
      "default": "idle"
    },
    "trustProxy": {
      "description": "Trust proxy configuration.",
      "oneOf": [
        { "type": "boolean" },
        { "type": "string" },
        { "type": "integer" },
        { "type": "array", "items": { "type": "string" } }
      ],
      "default": false
    },
    "return503OnClosing": {
      "type": "boolean",
      "description": "Return 503 when server is closing.",
      "default": true
    }
  },
  "additionalProperties": true
}

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