ngrok Agent API
If you want to programmatically control the ngrok agent, the Agent SDKs are usually a more flexible and powerful choice.
Overview
The ngrok agent exposes an HTTP API that enables programmatic access of:
- Collect status and metrics information
- Collect and replay captured requests
- Start and stop tunnels dynamically
Base URL and Authentication
| Base URL | http://127.0.0.1:4040/api |
| Authentication | None |
The ngrok agent API is exposed as part of ngrok's local web inspection interface. Because it is served on a local interface, the API has no authentication. The Base URL will change if you override web_addr in your configuration file.
Access the root API resource of a running ngrok agent
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Supported Content Types
Request parameters must be encoded to the API using application/json. Ensure that your client sets the request's Content-Type header appropriately. All responses returned by the API are application/json.
Versioning and API Stability
The ngrok agent API guarantees that breaking changes to the API will never be made unless the caller explicitly opts in to a newer version. The mechanism by which a caller opts into a new version of the API will be determined in the future when it becomes necessary. Examples of non-breaking changes to the API that will not be opt-in include the following.
- The addition of new resources
- The addition of new methods to existing resources
- The addition of new fields on existing resource representations
- Bug fixes which change the API to match documented behavior
The ngrok agent API accessible at http://localhost:4040/api supports only the agent configuration format. If you are using or planning to use configuration version 3, refer to the Agent Config Version 3 documentation for guidance.
List Tunnels
Returns a list of running tunnels with status and metrics information.
Request
GET/api/tunnels
Response
Parameters
tunnels | list of all running tunnels. See the Tunnel detail resource for docs on the parameters of each tunnel object |
Example Response
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Start tunnel
Dynamically starts a new tunnel on the ngrok agent. The request body parameters are the same as those you would use to define the tunnel in the configuration file.
Request
POST/api/tunnels
Parameters
Parameter names and behaviors are identical to those those defined in the configuration file. Use the tunnel definitions section as a reference for configuration parameters and their behaviors.
Example request body
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Response
201 status code with a response body describing the started tunnel. See the Tunnel detail resource for docs on the parameters of the response object
Example Response
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Tunnel detail
Get status and metrics about the named running tunnel
Request
GET/api/tunnels/:name
Response
Example Response
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Stop tunnel
Stop a running tunnel
Request
DELETE/api/tunnels/:name
Response
204 status code with an empty body
List Captured Requests
Returns a list of all HTTP requests captured for inspection. This will only return requests that are still in memory (ngrok evicts captured requests when their memory usage exceeds inspect_db_size)
Request
GET/api/requests/http
Query Parameters
limit | maximum number of requests to return |
tunnel_name | filter requests only for the given tunnel name |
Example Request
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Response
requests | list of captured requests. See the Captured Request Detail resource for docs on the request objects |
Example Response
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Replay Captured Request
Replays a request against the local endpoint of a tunnel
Request
POST/api/requests/http
Parameters
id | id of request to replay |
tunnel_name | name of the tunnel to play the request against. If unspecified, the request is played against the same tunnel it was recorded on |
Example Request
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Response
204 status code with an empty body
Delete Captured Requests
Deletes all captured requests
Request
DELETE/api/requests/http
Response
204 status code with no response body
Captured Request Detail
Returns metadata and raw bytes of a captured request. The raw data is base64-encoded in the JSON response. The response value maybe null if the local server has not yet responded to a request.
Request
GET/api/requests/http/:request_id
Response
Example Response
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Agent Status
Get status and metrics about the running agent
Request
GET /api/status
Example Request
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Response
200 status code with a json response describing the status of the agent
Example Response
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