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---
layout: api
page_title: Catalog - HTTP API
sidebar_current: api-catalog
description: |-
The /catalog endpoints register and deregister nodes, services, and checks in
Consul.
---
# Catalog HTTP API
The `/catalog` endpoints register and deregister nodes, services, and checks in
Consul. The catalog should not be confused with the agent, since some of the
API methods look similar.
## Register Entity
This endpoint is a low-level mechanism for registering or updating
entries in the catalog. It is usually preferable to instead use the
[agent endpoints](/api/agent.html) for registration as they are simpler and
perform [anti-entropy](/docs/internals/anti-entropy.html).
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `PUT` | `/catalog/register` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries),
[consistency modes](/api/index.html#consistency-modes), and
[required ACLs](/api/index.html#acls).
| Blocking Queries | Consistency Modes | ACL Required |
| ---------------- | ----------------- | -------------------------- |
| `NO` | `none` | `node:write,service:write` |
### Parameters
- `ID` `(string: "")` - An optional UUID to assign to the service. If not
provided, one is generated. This must be a 36-character UUID.
- `Node` `(string: <required>)` - Specifies the node ID to register.
- `Address` `(string: <required>)` - Specifies the address to register.
- `Datacenter` `(string: "")` - Specifies the datacenter, which defaults to the
agent's datacenter if not provided.
- `TaggedAddresses` `(map<string|string>: nil)` - Specifies the tagged
addresses.
- `NodeMeta` `(map<string|string>: nil)` - Specifies arbitrary KV metadata
pairs for filtering purposes.
- `Service` `(Service: nil)` - Specifies to register a service. If `ID` is not
provided, it will be defaulted to the value of the `Service.Service` property.
Only one service with a given `ID` may be present per node. The service
`Tags`, `Address`, and `Port` fields are all optional.
- `Check` `(Check: nil)` - Specifies to register a check. The register API
manipulates the health check entry in the Catalog, but it does not setup the
script, TTL, or HTTP check to monitor the node's health. To truly enable a new
health check, the check must either be provided in agent configuration or set
via the [agent endpoint](agent.html).
The `CheckID` can be omitted and will default to the value of `Name`. As
with `Service.ID`, the `CheckID` must be unique on this node. `Notes` is an
opaque field that is meant to hold human-readable text. If a `ServiceID` is
provided that matches the `ID` of a service on that node, the check is
treated as a service level health check, instead of a node level health
check. The `Status` must be one of `passing`, `warning`, or `critical`.
Multiple checks can be provided by replacing `Check` with `Checks` and
sending an array of `Check` objects.
It is important to note that `Check` does not have to be provided with `Service`
and vice versa. A catalog entry can have either, neither, or both.
### Sample Payload
```json
{
"Datacenter": "dc1",
"ID": "40e4a748-2192-161a-0510-9bf59fe950b5",
"Node": "foobar",
"Address": "192.168.10.10",
"TaggedAddresses": {
"lan": "192.168.10.10",
"wan": "10.0.10.10"
},
"NodeMeta": {
"somekey": "somevalue"
},
"Service": {
"ID": "redis1",
"Service": "redis",
"Tags": [
"primary",
"v1"
],
"Address": "127.0.0.1",
"Port": 8000
},
"Check": {
"Node": "foobar",
"CheckID": "service:redis1",
"Name": "Redis health check",
"Notes": "Script based health check",
"Status": "passing",
"ServiceID": "redis1"
}
}
```
### Sample Request
```text
$ curl \
--request PUT \
--data @payload.json \
https://consul.rocks/v1/catalog/register
```
## Deregister Entity
This endpoint is a low-level mechanism for directly removing
entries from the Catalog. It is usually preferable to instead use the
[agent endpoints](/api/agent.html) for deregistration as they are simpler and
perform [anti-entropy](/docs/internals/anti-entropy.html).
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `PUT` | `/catalog/deregister` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries),
[consistency modes](/api/index.html#consistency-modes), and
[required ACLs](/api/index.html#acls).
| Blocking Queries | Consistency Modes | ACL Required |
| ---------------- | ----------------- | -------------------------- |
| `NO` | `none` | `node:write,service:write` |
### Parameters
The behavior of the endpoint depends on what keys are provided.
- `Node` `(string: <required>)` - Specifies the ID of the node. If no other
values are provided, this node, all its services, and all its checks are
removed.
- `Datacenter` `(string: "")` - Specifies the datacenter, which defaults to the
agent's datacenter if not provided.
- `CheckID` `(string: "")` - Specifies the ID of the check to remove.
- `ServiceID` `(string: "")` - Specifies the ID of the service to remove. The
service and all associated checks will be removed.
### Sample Payloads
```json
{
"Datacenter": "dc1",
"Node": "foobar"
}
```
```json
{
"Datacenter": "dc1",
"Node": "foobar",
"CheckID": "service:redis1"
}
```
```json
{
"Datacenter": "dc1",
"Node": "foobar",
"ServiceID": "redis1"
}
```
### Sample Request
```text
$ curl \
--request PUT \
--data @payload.json \
https://consul.rocks/v1/catalog/deregister
```
## List Datacenters
This endpoint returns the list of all known datacenters. The datacenters will be
sorted in ascending order based on the estimated median round trip time from the
server to the servers in that datacenter.
This endpoint does not require a cluster leader and will succeed even during an
availability outage. Therefore, it can be used as a simple check to see if any
Consul servers are routable.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `GET` | `/catalog/datacenters` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries),
[consistency modes](/api/index.html#consistency-modes), and
[required ACLs](/api/index.html#acls).
| Blocking Queries | Consistency Modes | ACL Required |
| ---------------- | ----------------- | ------------ |
| `NO` | `none` | `none` |
### Sample Request
```text
$ curl \
https://consul.rocks/v1/catalog/datacenters
```
### Sample Response
```json
["dc1", "dc2"]
```
## List Nodes
This endpoint and returns the nodes registered in a given datacenter.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `GET` | `/catalog/nodes` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries),
[consistency modes](/api/index.html#consistency-modes), and
[required ACLs](/api/index.html#acls).
| Blocking Queries | Consistency Modes | ACL Required |
| ---------------- | ----------------- | ------------ |
| `YES` | `all` | `node:read` |
### Parameters
- `dc` `(string: "")` - Specifies the datacenter to query. This will default to
the datacenter of the agent being queried. This is specified as part of the
URL as a query parameter.
- `near` `(string: "")` - Specifies a node name to sort the node list in
ascending order based on the estimated round trip time from that node. Passing
`?near=_agent` will use the agent's node for the sort. This is specified as
part of the URL as a query parameter.
- `node-meta` `(string: "")` - Specifies a desired node metadata key/value pair
of the form `key:value`. This parameter can be specified multiple times, and
will filter the results to nodes with the specified key/value pairs. This is
specified as part of the URL as a query parameter.
### Sample Request
```text
$ curl \
https://consul.rocks/v1/catalog/nodes
```
### Sample Response
```json
[
{
"ID": "40e4a748-2192-161a-0510-9bf59fe950b5",
"Node": "baz",
"Address": "10.1.10.11",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "10.1.10.11",
"wan": "10.1.10.11"
},
"Meta": {
"instance_type": "t2.medium"
}
},
{
"ID": "8f246b77-f3e1-ff88-5b48-8ec93abf3e05",
"Node": "foobar",
"Address": "10.1.10.12",
"Datacenter": "dc2",
"TaggedAddresses": {
"lan": "10.1.10.11",
"wan": "10.1.10.12"
},
"Meta": {
"instance_type": "t2.large"
}
}
]
```
## List Services
This endpoint returns the services registered in a given datacenter.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `GET` | `/catalog/services` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries),
[consistency modes](/api/index.html#consistency-modes), and
[required ACLs](/api/index.html#acls).
| Blocking Queries | Consistency Modes | ACL Required |
| ---------------- | ----------------- | -------------- |
| `YES` | `all` | `service:read` |
### Parameters
- `dc` `(string: "")` - Specifies the datacenter to query. This will default to
the datacenter of the agent being queried. This is specified as part of the
URL as a query parameter.
- `node-meta` `(string: "")` - Specifies a desired node metadata key/value pair
of the form `key:value`. This parameter can be specified multiple times, and
will filter the results to nodes with the specified key/value pairs. This is
specified as part of the URL as a query parameter.
### Sample Request
```text
$ curl \
https://consul.rocks/v1/catalog/services
```
### Sample Response
```json
{
"consul": [],
"redis": [],
"postgresql": [
"primary",
"secondary"
]
}
```
The keys are the service names, and the array values provide all known tags for
a given service.
## List Nodes for Service
This endpoint returns the nodes providing a service in a given datacenter.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `GET` | `/catalog/service/:service` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries),
[consistency modes](/api/index.html#consistency-modes), and
[required ACLs](/api/index.html#acls).
| Blocking Queries | Consistency Modes | ACL Required |
| ---------------- | ----------------- | ------------------------ |
| `YES` | `all` | `node:read,service:read` |
### Parameters
- `service` `(string: <required>)` - Specifies the name of the service for which
to list nodes. This is specified as part of the URL.
- `dc` `(string: "")` - Specifies the datacenter to query. This will default to
the datacenter of the agent being queried. This is specified as part of the
URL as a query parameter.
- `tag` `(string: "")` - Specifies tags to filter on.
- `near` `(string: "")` - Specifies a node name to sort the node list in
ascending order based on the estimated round trip time from that node. Passing
`?near=_agent` will use the agent's node for the sort. This is specified as
part of the URL as a query parameter.
- `node-meta` `(string: "")` - Specifies a desired node metadata key/value pair
of the form `key:value`. This parameter can be specified multiple times, and
will filter the results to nodes with the specified key/value pairs. This is
specified as part of the URL as a query parameter.
### Sample Request
```text
$ curl \
https://consul.rocks/v1/catalog/service/my-service
```
### Sample Response
```json
[
{
"ID": "40e4a748-2192-161a-0510-9bf59fe950b5",
"Node": "foobar",
"Address": "192.168.10.10",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "192.168.10.10",
"wan": "10.0.10.10"
},
"NodeMeta": {
"somekey": "somevalue"
},
"CreateIndex": 51,
"ModifyIndex": 51,
"ServiceAddress": "172.17.0.3",
"ServiceEnableTagOverride": false,
"ServiceID": "32a2a47f7992:nodea:5000",
"ServiceName": "foobar",
"ServicePort": 5000,
"ServiceTags": [
"tacos"
]
}
]
```
- `Address` is the IP address of the Consul node on which the service is
registered.
- `Datacenter` is the data center of the Consul node on which the service is
registered.
- `TaggedAddresses` is the list of explicit LAN and WAN IP addresses for the
agent
- `NodeMeta` is a list of user-defined metadata key/value pairs for the node
- `CreateIndex` is an internal index value representing when the service was
created
- `ModifyIndex` is the last index that modified the service
- `Node` is the name of the Consul node on which the service is registered
- `ServiceAddress` is the IP address of the service host — if empty, node
address should be used
- `ServiceEnableTagOverride` indicates whether service tags can be overridden on
this service
- `ServiceID` is a unique service instance identifier
- `ServiceName` is the name of the service
- `ServicePort` is the port number of the service
- `ServiceTags` is a list of tags for the service
## List Services for Node
This endpoint returns the node's registered services.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `GET` | `/catalog/node/:node` | `application/json` |
The table below shows this endpoint's support for blocking queries and
consistency modes.
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries),
[consistency modes](/api/index.html#consistency-modes), and
[required ACLs](/api/index.html#acls).
| Blocking Queries | Consistency Modes | ACL Required |
| ---------------- | ----------------- | ------------------------ |
| `YES` | `all` | `node:read,service:read` |
### Parameters
- `node` `(string: <required>)` - Specifies the name of the node for which
to list services. This is specified as part of the URL.
- `dc` `(string: "")` - Specifies the datacenter to query. This will default to
the datacenter of the agent being queried. This is specified as part of the
URL as a query parameter.
### Sample Request
```text
$ curl \
https://consul.rocks/v1/catalog/node/my-node
```
### Sample Response
```json
{
"Node": {
"ID": "40e4a748-2192-161a-0510-9bf59fe950b5",
"Node": "foobar",
"Address": "10.1.10.12",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "10.1.10.12",
"wan": "10.1.10.12"
},
"Meta": {
"instance_type": "t2.medium"
}
},
"Services": {
"consul": {
"ID": "consul",
"Service": "consul",
"Tags": null,
"Port": 8300
},
"redis": {
"ID": "redis",
"Service": "redis",
"Tags": [
"v1"
],
"Port": 8000
}
}
}
```
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