Restore an experiment version

import requests

url = "https://app.langwatch.ai/api/v1/experiments/{slug}/versions/{version}/restore"

headers = {"X-Auth-Token": "<api-key>"}

response = requests.post(url, headers=headers)

print(response.text)

const options = {method: 'POST', headers: {'X-Auth-Token': '<api-key>'}};

fetch('https://app.langwatch.ai/api/v1/experiments/{slug}/versions/{version}/restore', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "version": 123
}

This response has no body data.

This response has no body data.

This response has no body data.

POST

api

experiments

{slug}

versions

{version}

restore

Restore an experiment version

import requests

url = "https://app.langwatch.ai/api/v1/experiments/{slug}/versions/{version}/restore"

headers = {"X-Auth-Token": "<api-key>"}

response = requests.post(url, headers=headers)

print(response.text)

const options = {method: 'POST', headers: {'X-Auth-Token': '<api-key>'}};

fetch('https://app.langwatch.ai/api/v1/experiments/{slug}/versions/{version}/restore', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "version": 123
}

This response has no body data.

This response has no body data.

This response has no body data.

Authorizations

X-Auth-Token

string

header

required

Project API key for sending traces and accessing project-scoped resources. Format: sk-lw-... (no underscore). Obtain one by creating a project via the Admin API or the LangWatch UI.

Path Parameters

slug

string

required

Minimum string length: 1

version

integer

required

The version to restore, as listed by GET /api/experiments/{slug}/versions

Required range: 0 <= x <= 9007199254740991

Response

Success

version

number

required

The new version the restore wrote. History is never rewritten, so the restored version is still in the list.

Last modified on October 12, 2026