---
title: "Trigger a new pipeline"
method: POST
path: "/project/{project-slug}/pipeline"
tags: ["Pipeline"]
---

# Trigger a new pipeline

`POST /project/{project-slug}/pipeline`

**[This endpoint is superseded by the [new Trigger Pipeline API](#tag/Pipeline/operation/triggerPipelineRun), which supports all organization and pipeline types except GitLab.]** Triggers a new pipeline on the project. Does not support triggering pipelines integrated with GitLab or GitHub App.

## Path parameters

- `project-slug` string, required

## Request body

- object — The information you can supply when triggering a pipeline.
  - `branch` string — The branch where the pipeline ran. The HEAD commit on this branch was used for the pipeline. Note that `branch` and `tag` are mutually exclusive. To trigger a pipeline for a PR by number use `pull/<number>/head` for the PR ref or `pull/<number>/merge` for the merge ref (GitHub only).
  - `tag` string — The tag used by the pipeline. The commit that this tag points to was used for the pipeline. Note that `branch` and `tag` are mutually exclusive.
  - `parameters` object — An object containing pipeline parameters and their values. Pipeline parameters have the following size limits: 100 max entries, 128 maximum key length, 512 maximum value length.

## Response `201`

The created pipeline.

- object — A pipeline creation response.
  - `id` string, uuid, required — The unique ID of the pipeline.
  - `state` 'created' | 'errored' | 'setup-pending' | 'setup' | 'pending', required — The current state of the pipeline.
  - `number` integer, required — The number of the pipeline.
  - `created_at` string, date-time, required — The date and time the pipeline was created.

## Other responses

- `default` — Error response.

---

[API](https://skmtc.net/circleci/apis/api-v2.md) · [All operations](https://skmtc.net/circleci/apis/api-v2/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/circleci/api-v2/versions/b9c0e0c24058/schema)