Append Markdown to Page

//native

/**

 * Append Markdown to Page

 * Insert Notion-flavored Markdown into a page: at the end (default), at the start, or after existing text given as "start text...end text" in `after`. Needs the update content capability.

 */

export async function main(

  auth: RT.Notion,

  page_id: string,

  markdown: string,

  at: "end" | "start" = "end",

  after: string | undefined

) {

  const insert_content: { [key: string]: any } = { content: markdown }

  if (after !== undefined && after !== "") {

    insert_content.after = after

  } else {

    insert_content.position = { type: at }

  }

  const response = await fetch(

    `https://api.notion.com/v1/pages/${page_id}/markdown`,

    {

      method: "PATCH",

      headers: {

        Authorization: `Bearer ${auth.token}`,

        "Content-Type": "application/json",

        Accept: "application/json",

        "Notion-Version": "2026-03-11",

      },

      body: JSON.stringify({ type: "insert_content", insert_content }),

    }

  )

  if (!response.ok) {

    throw new Error(`${response.status} ${await response.text()}`)

  }

  return await response.json()

}