Extract endpoints from OpenAPI YAML file

extract-endpoints.js

const fs = require('fs');
const yaml = require('js-yaml');

function listEndpoints(openapiFile) {
  try {
    const openapiData = yaml.safeLoad(fs.readFileSync(openapiFile, 'utf8'));
    const paths = openapiData.paths || {};
    const endpoints = [];
    
    for (const path in paths) {
      const methods = paths[path];
      for (const method in methods) {
        const endpoint = `${method.toUpperCase()} ${path}`;
        endpoints.push(endpoint);
      }
    }
    
    return endpoints;
  } catch (error) {
    console.error(`Error loading OpenAPI file: ${error}`);
    return [];
  }
}

// Usage example
const openapiFile = 'your-openapi.yaml';
const endpoints = listEndpoints(openapiFile);
for (const endpoint of endpoints) {
  console.log(endpoint);
}

You can use the yq CLI tool as another way which can be simpler in this case (you only need to change the yaml filename):

# Take the array items of paths then output each path key (an endpoint) with an array of it's keys (methods):
yq '.paths[] | {key: keys}' your-openapi.yaml

For example on the Docker Engine API:

# ...
/containers/{id}:
  - delete
/containers/{id}/archive:
  - head
  - get
  - put
/containers/prune:
  - post
/images/json:
  - get
/build:
  - post
# ...

If you need another output format like JSON you can use -o json 👍

---

The above may not be as friendly if you need an object with standard keys to query.

A more complex example that outputs an array of objects with an additional id field that better identifies the endpoint:

# Entire yq expression wrapped with `[` + `]` for a top-level array
# Each paths element creates an object with `endpoint` + `methods` keys
# Each `methods` key has an array of objects for the method kind and associated id
# Added example of uppercase conversion.
# NOTE: `|` is the pipe operator, similar to `map()` in JS. I used it more extensively here and with nested contexts.
# `.` refers to the data piped in, `.[]` is for selecting all direct array elements, `key` refers to the current key (within the scope of the pipe).
yq '[.paths[] | {"endpoint": key, "methods": [.[] | {"kind": key | upcase, "id": .operationId}] }]' api.yaml

Output example:

# ...
- endpoint: /secrets
  methods:
    - kind: GET
      id: "SecretList"
- endpoint: /secrets/create
  methods:
    - kind: POST
      id: "SecretCreate"
- endpoint: /secrets/{id}
  methods:
    - kind: GET
      id: "SecretInspect"
    - kind: DELETE
      id: "SecretDelete"
- endpoint: /secrets/{id}/update
  methods:
    - kind: POST
      id: "SecretUpdate"
# ...

With `yq -o=json` for JSON output

[
// ...
  {
    "endpoint": "/secrets",
    "methods": [
      {
        "kind": "GET",
        "id": "SecretList"
      }
    ]
  },
  {
    "endpoint": "/secrets/create",
    "methods": [
      {
        "kind": "POST",
        "id": "SecretCreate"
      }
    ]
  },
  {
    "endpoint": "/secrets/{id}",
    "methods": [
      {
        "kind": "GET",
        "id": "SecretInspect"
      },
      {
        "kind": "DELETE",
        "id": "SecretDelete"
      }
    ]
  },
  {
    "endpoint": "/secrets/{id}/update",
    "methods": [
      {
        "kind": "POST",
        "id": "SecretUpdate"
      }
    ]
  },
// ...
]

yq starts to be less pleasant the more complex the expression gets, especially if you need more flexibility there the approach with JS is easier to grok :)

This might be of interest for anyone landing here too.

yq + qsv + csview - Extract to CSV + markdown table output

Using the same Docker OpenAPI document (direct YAML link) as before, here is a way to extract the desired data with yq and do some extra processing with qsv to format it:

# yq will filter and format the data into an array of values we want from the input
# The comments within the string value are safe to copy/paste as a shell command.
# yq outputs CSV for qsv to then adds the column headers and sort by column order.
# csview then renders this out in the preferred style such as formatted markdown.
yq -o=csv '.paths[] | .[] | [
  .tags | join(" "), # An array, can be used to assign the endpoint to a group
  (parent | key),    # The URL path for this endpoint
  key | upcase,      # The HTTP method uppercased `get => GET`
  .operationId       # Unique identifier for the endpoint
]' api.yaml \
| qsv rename --no-headers GROUP,PATH,METHOD,ID \
| qsv sort \
| csview --style markdown

This will output a table like this:

Markdown output (rendered)

GROUP	PATH	METHOD	ID
Config	/configs	GET	ConfigList
Config	/configs/create	POST	ConfigCreate
Config	/configs/{id}	DELETE	ConfigDelete
Config	/configs/{id}	GET	ConfigInspect
Config	/configs/{id}/update	POST	ConfigUpdate
Container	/containers/create	POST	ContainerCreate
Container	/containers/json	GET	ContainerList
Container	/containers/prune	POST	ContainerPrune
Container	/containers/{id}	DELETE	ContainerDelete
Container	/containers/{id}/archive	GET	ContainerArchive
Container	/containers/{id}/archive	HEAD	ContainerArchiveInfo
Container	/containers/{id}/archive	PUT	PutContainerArchive
Container	/containers/{id}/attach	POST	ContainerAttach
Container	/containers/{id}/attach/ws	GET	ContainerAttachWebsocket
Container	/containers/{id}/changes	GET	ContainerChanges
Container	/containers/{id}/export	GET	ContainerExport
Container	/containers/{id}/json	GET	ContainerInspect
Container	/containers/{id}/kill	POST	ContainerKill
Container	/containers/{id}/logs	GET	ContainerLogs
Container	/containers/{id}/pause	POST	ContainerPause
Container	/containers/{id}/rename	POST	ContainerRename
Container	/containers/{id}/resize	POST	ContainerResize
Container	/containers/{id}/restart	POST	ContainerRestart
Container	/containers/{id}/start	POST	ContainerStart
Container	/containers/{id}/stats	GET	ContainerStats
Container	/containers/{id}/stop	POST	ContainerStop
Container	/containers/{id}/top	GET	ContainerTop
Container	/containers/{id}/unpause	POST	ContainerUnpause
Container	/containers/{id}/update	POST	ContainerUpdate
Container	/containers/{id}/wait	POST	ContainerWait
Distribution	/distribution/{name}/json	GET	DistributionInspect
Exec	/containers/{id}/exec	POST	ContainerExec
Exec	/exec/{id}/json	GET	ExecInspect
Exec	/exec/{id}/resize	POST	ExecResize
Exec	/exec/{id}/start	POST	ExecStart
Image	/build	POST	ImageBuild
Image	/build/prune	POST	BuildPrune
Image	/commit	POST	ImageCommit
Image	/images/create	POST	ImageCreate
Image	/images/get	GET	ImageGetAll
Image	/images/json	GET	ImageList
Image	/images/load	POST	ImageLoad
Image	/images/prune	POST	ImagePrune
Image	/images/search	GET	ImageSearch
Image	/images/{name}	DELETE	ImageDelete
Image	/images/{name}/get	GET	ImageGet
Image	/images/{name}/history	GET	ImageHistory
Image	/images/{name}/json	GET	ImageInspect
Image	/images/{name}/push	POST	ImagePush
Image	/images/{name}/tag	POST	ImageTag
Network	/networks	GET	NetworkList
Network	/networks/create	POST	NetworkCreate
Network	/networks/prune	POST	NetworkPrune
Network	/networks/{id}	DELETE	NetworkDelete
Network	/networks/{id}	GET	NetworkInspect
Network	/networks/{id}/connect	POST	NetworkConnect
Network	/networks/{id}/disconnect	POST	NetworkDisconnect
Node	/nodes	GET	NodeList
Node	/nodes/{id}	DELETE	NodeDelete
Node	/nodes/{id}	GET	NodeInspect
Node	/nodes/{id}/update	POST	NodeUpdate
Plugin	/plugins	GET	PluginList
Plugin	/plugins/create	POST	PluginCreate
Plugin	/plugins/privileges	GET	GetPluginPrivileges
Plugin	/plugins/pull	POST	PluginPull
Plugin	/plugins/{name}	DELETE	PluginDelete
Plugin	/plugins/{name}/disable	POST	PluginDisable
Plugin	/plugins/{name}/enable	POST	PluginEnable
Plugin	/plugins/{name}/json	GET	PluginInspect
Plugin	/plugins/{name}/push	POST	PluginPush
Plugin	/plugins/{name}/set	POST	PluginSet
Plugin	/plugins/{name}/upgrade	POST	PluginUpgrade
Secret	/secrets	GET	SecretList
Secret	/secrets/create	POST	SecretCreate
Secret	/secrets/{id}	DELETE	SecretDelete
Secret	/secrets/{id}	GET	SecretInspect
Secret	/secrets/{id}/update	POST	SecretUpdate
Service	/services	GET	ServiceList
Service	/services/create	POST	ServiceCreate
Service	/services/{id}	DELETE	ServiceDelete
Service	/services/{id}	GET	ServiceInspect
Service	/services/{id}/logs	GET	ServiceLogs
Service	/services/{id}/update	POST	ServiceUpdate
Session	/session	POST	Session
Swarm	/swarm	GET	SwarmInspect
Swarm	/swarm/init	POST	SwarmInit
Swarm	/swarm/join	POST	SwarmJoin
Swarm	/swarm/leave	POST	SwarmLeave
Swarm	/swarm/unlock	POST	SwarmUnlock
Swarm	/swarm/unlockkey	GET	SwarmUnlockkey
Swarm	/swarm/update	POST	SwarmUpdate
System	/_ping	GET	SystemPing
System	/_ping	HEAD	SystemPingHead
System	/auth	POST	SystemAuth
System	/events	GET	SystemEvents
System	/info	GET	SystemInfo
System	/system/df	GET	SystemDataUsage
System	/version	GET	SystemVersion
Task	/tasks	GET	TaskList
Task	/tasks/{id}	GET	TaskInspect
Task	/tasks/{id}/logs	GET	TaskLogs
Volume	/volumes	GET	VolumeList
Volume	/volumes/create	POST	VolumeCreate
Volume	/volumes/prune	POST	VolumePrune
Volume	/volumes/{name}	DELETE	VolumeDelete
Volume	/volumes/{name}	GET	VolumeInspect
Volume	/volumes/{name}	PUT	VolumeUpdate

Markdown output (raw)

|    GROUP     |            PATH            | METHOD |            ID            |
|--------------|----------------------------|--------|--------------------------|
| Config       | /configs                   | GET    | ConfigList               |
| Config       | /configs/create            | POST    | ConfigCreate             |
| Config       | /configs/{id}              | DELETE  | ConfigDelete             |
| Config       | /configs/{id}              | GET     | ConfigInspect            |
| Config       | /configs/{id}/update       | POST    | ConfigUpdate             |
| Container    | /containers/create         | POST    | ContainerCreate          |
| Container    | /containers/json           | GET     | ContainerList            |
| Container    | /containers/prune          | POST    | ContainerPrune           |
| Container    | /containers/{id}           | DELETE  | ContainerDelete          |
| Container    | /containers/{id}/archive   | GET     | ContainerArchive         |
| Container    | /containers/{id}/archive   | HEAD    | ContainerArchiveInfo     |
| Container    | /containers/{id}/archive   | PUT     | PutContainerArchive      |
| Container    | /containers/{id}/attach    | POST    | ContainerAttach          |
| Container    | /containers/{id}/attach/ws | GET     | ContainerAttachWebsocket |
| Container    | /containers/{id}/changes   | GET     | ContainerChanges         |
| Container    | /containers/{id}/export    | GET     | ContainerExport          |
| Container    | /containers/{id}/json      | GET     | ContainerInspect         |
| Container    | /containers/{id}/kill      | POST    | ContainerKill            |
| Container    | /containers/{id}/logs      | GET     | ContainerLogs            |
| Container    | /containers/{id}/pause     | POST    | ContainerPause           |
| Container    | /containers/{id}/rename    | POST    | ContainerRename          |
| Container    | /containers/{id}/resize    | POST    | ContainerResize          |
| Container    | /containers/{id}/restart   | POST    | ContainerRestart         |
| Container    | /containers/{id}/start     | POST    | ContainerStart           |
| Container    | /containers/{id}/stats     | GET     | ContainerStats           |
| Container    | /containers/{id}/stop      | POST    | ContainerStop            |
| Container    | /containers/{id}/top       | GET     | ContainerTop             |
| Container    | /containers/{id}/unpause   | POST    | ContainerUnpause         |
| Container    | /containers/{id}/update    | POST    | ContainerUpdate          |
| Container    | /containers/{id}/wait      | POST    | ContainerWait            |
| Distribution | /distribution/{name}/json  | GET     | DistributionInspect      |
| Exec         | /containers/{id}/exec      | POST    | ContainerExec            |
| Exec         | /exec/{id}/json            | GET     | ExecInspect              |
| Exec         | /exec/{id}/resize          | POST    | ExecResize               |
| Exec         | /exec/{id}/start           | POST    | ExecStart                |
| Image        | /build                     | POST    | ImageBuild               |
| Image        | /build/prune               | POST    | BuildPrune               |
| Image        | /commit                    | POST    | ImageCommit              |
| Image        | /images/create             | POST    | ImageCreate              |
| Image        | /images/get                | GET     | ImageGetAll              |
| Image        | /images/json               | GET     | ImageList                |
| Image        | /images/load               | POST    | ImageLoad                |
| Image        | /images/prune              | POST    | ImagePrune               |
| Image        | /images/search             | GET     | ImageSearch              |
| Image        | /images/{name}             | DELETE  | ImageDelete              |
| Image        | /images/{name}/get         | GET     | ImageGet                 |
| Image        | /images/{name}/history     | GET     | ImageHistory             |
| Image        | /images/{name}/json        | GET     | ImageInspect             |
| Image        | /images/{name}/push        | POST    | ImagePush                |
| Image        | /images/{name}/tag         | POST    | ImageTag                 |
| Network      | /networks                  | GET     | NetworkList              |
| Network      | /networks/create           | POST    | NetworkCreate            |
| Network      | /networks/prune            | POST    | NetworkPrune             |
| Network      | /networks/{id}             | DELETE  | NetworkDelete            |
| Network      | /networks/{id}             | GET     | NetworkInspect           |
| Network      | /networks/{id}/connect     | POST    | NetworkConnect           |
| Network      | /networks/{id}/disconnect  | POST    | NetworkDisconnect        |
| Node         | /nodes                     | GET     | NodeList                 |
| Node         | /nodes/{id}                | DELETE  | NodeDelete               |
| Node         | /nodes/{id}                | GET     | NodeInspect              |
| Node         | /nodes/{id}/update         | POST    | NodeUpdate               |
| Plugin       | /plugins                   | GET     | PluginList               |
| Plugin       | /plugins/create            | POST    | PluginCreate             |
| Plugin       | /plugins/privileges        | GET     | GetPluginPrivileges      |
| Plugin       | /plugins/pull              | POST    | PluginPull               |
| Plugin       | /plugins/{name}            | DELETE  | PluginDelete             |
| Plugin       | /plugins/{name}/disable    | POST    | PluginDisable            |
| Plugin       | /plugins/{name}/enable     | POST    | PluginEnable             |
| Plugin       | /plugins/{name}/json       | GET     | PluginInspect            |
| Plugin       | /plugins/{name}/push       | POST    | PluginPush               |
| Plugin       | /plugins/{name}/set        | POST    | PluginSet                |
| Plugin       | /plugins/{name}/upgrade    | POST    | PluginUpgrade            |
| Secret       | /secrets                   | GET     | SecretList               |
| Secret       | /secrets/create            | POST    | SecretCreate             |
| Secret       | /secrets/{id}              | DELETE  | SecretDelete             |
| Secret       | /secrets/{id}              | GET     | SecretInspect            |
| Secret       | /secrets/{id}/update       | POST    | SecretUpdate             |
| Service      | /services                  | GET     | ServiceList              |
| Service      | /services/create           | POST    | ServiceCreate            |
| Service      | /services/{id}             | DELETE  | ServiceDelete            |
| Service      | /services/{id}             | GET     | ServiceInspect           |
| Service      | /services/{id}/logs        | GET     | ServiceLogs              |
| Service      | /services/{id}/update      | POST    | ServiceUpdate            |
| Session      | /session                   | POST    | Session                  |
| Swarm        | /swarm                     | GET     | SwarmInspect             |
| Swarm        | /swarm/init                | POST    | SwarmInit                |
| Swarm        | /swarm/join                | POST    | SwarmJoin                |
| Swarm        | /swarm/leave               | POST    | SwarmLeave               |
| Swarm        | /swarm/unlock              | POST    | SwarmUnlock              |
| Swarm        | /swarm/unlockkey           | GET     | SwarmUnlockkey           |
| Swarm        | /swarm/update              | POST    | SwarmUpdate              |
| System       | /_ping                     | GET     | SystemPing               |
| System       | /_ping                     | HEAD    | SystemPingHead           |
| System       | /auth                      | POST    | SystemAuth               |
| System       | /events                    | GET     | SystemEvents             |
| System       | /info                      | GET     | SystemInfo               |
| System       | /system/df                 | GET     | SystemDataUsage          |
| System       | /version                   | GET     | SystemVersion            |
| Task         | /tasks                     | GET     | TaskList                 |
| Task         | /tasks/{id}                | GET     | TaskInspect              |
| Task         | /tasks/{id}/logs           | GET     | TaskLogs                 |
| Volume       | /volumes                   | GET     | VolumeList               |
| Volume       | /volumes/create            | POST    | VolumeCreate             |
| Volume       | /volumes/prune             | POST    | VolumePrune              |
| Volume       | /volumes/{name}            | DELETE  | VolumeDelete             |
| Volume       | /volumes/{name}            | GET     | VolumeInspect            |
| Volume       | /volumes/{name}            | PUT     | VolumeUpdate             |

With qsv you can rearrange the columns, omit columns, etc quite easily.

---

Advanced processing with QSV

This example that transforms that same CSV output from yq to a filtered subset rearranged and sorted to different requirements:

# Same yq operation as before, but now qsv will filter rows of the GROUP column
# Then for any PATH values that have a URL parameter substring, replace it with `*`
# The METHOD and PATH columns are extracted via `select` with new column positions
# Instead of sorting by the 1st colum (METHOD), sort by 2nd colum (PATH)
# Finally `table` will output an unstyled table of the data, tail to remove headers
yq -o=csv '.paths[] | .[] | [
  .tags | join(" "), # An array, can be used to assign the endpoint to a group
  (parent | key),    # The URL path for this endpoint
  key | upcase,      # The HTTP method uppercased `get => GET`
  .operationId       # Unique identifier for the endpoint
]' api.yaml \
| qsv rename --no-headers GROUP,PATH,METHOD,ID \
| qsv search --ignore-case --literal --select GROUP secret \
| qsv replace --quiet --select PATH '\{.+\}' '*' \
| qsv select METHOD,PATH \
| qsv sort --select PATH \
| qsv table | tail -n +2

# Result:
GET     /secrets
GET     /secrets/*
DELETE  /secrets/*
POST    /secrets/*/update
POST    /secrets/create

That output is more aligned with the original JS example (extra processing aside).

Swapping qsv table | tail -n +2 for csview --style markdown we get the same data formatted for rendering:

METHOD	PATH
GET	/secrets
GET	/secrets/*
DELETE	/secrets/*
POST	/secrets/*/update
POST	/secrets/create

---

JS to yq port

The actual minimal equivalent for the JS example output would be:

# Output as space delimited strings:
yq '.paths[][] | (key|upcase) + " " + (parent|key)' api.yaml

# Result:
GET /secrets
POST /secrets/create
GET /secrets/{id}
DELETE /secrets/{id}
POST /secrets/{id}/update

# With QSV for better column aligned output, uses arrays with CSV output:
yq -o=csv '.paths[] | [.[] | [
  (key|upcase), # The HTTP method uppercased `get => GET`
  (parent|key)  # The URL path for this endpoint
]]' api.yaml | qsv table

# Result:
GET     /secrets
POST    /secrets/create
GET     /secrets/{id}
DELETE  /secrets/{id}
POST    /secrets/{id}/update

NOTE: Result outputs were filtered with grep secrets for brevity, unlike the prior advanced example which actually filtered results by specific column via qsv search.