curl -X PATCH 'https://api.github.com/orgs/example-org/properties/installations/values' \
  -H "Authorization: Bearer $GITHUB_TOKEN" \
  -H 'Accept: application/vnd.github+json' \
  -H 'X-GitHub-Api-Version: 2026-03-10' \
  -H 'Content-Type: application/json' \
  -d '{
  "repository_names": [
    "example-repository-names"
  ],
  "properties": [
    {
      "property_name": "example-property-name",
      "value": "example-value"
    }
  ]
}'

# PATCH /orgs/{org}/properties/installations/values (GitHub API)
Base URL: https://api.github.com
Auth: Authorization; GitHub token; required.
Request formats: application/json.
Last verified: 2026-09-29

> Create or update external custom property values for organization repositories

## Critical Gotchas
* GitHub recommends an `Accept: application/vnd.github+json` header and an explicit `X-GitHub-Api-Version` header.
* Fine-grained tokens only authorize repositories and permissions selected when the token is created.

## cURL
curl -X PATCH 'https://api.github.com/orgs/example-org/properties/installations/values' \
  -H "Authorization: Bearer $GITHUB_TOKEN" \
  -H 'Accept: application/vnd.github+json' \
  -H 'X-GitHub-Api-Version: 2026-03-10' \
  -H 'Content-Type: application/json' \
  -d '{
  "repository_names": [
    "example-repository-names"
  ],
  "properties": [
    {
      "property_name": "example-property-name",
      "value": "example-value"
    }
  ]
}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| org | path | string | Yes | The organization name. The name is not case sensitive. |
| repository_names | body | string[] | Yes | The names of repositories that the external custom property values will be ap... |
| properties | body | object[] | Yes | List of external custom property names and associated values to apply to the... |

## Response example
null

---
Need an API key? Get one at https://github.com/settings/tokens

PATCH

PATCH /orgs/{org}/properties/installations/values — GitHub API

GitHub token (required); https://api.github.com

GitHub API

Create or update external custom property values for organization repositories

Base URL: https://api.github.com
Auth: Authorization: Bearer <GITHUB_API_KEY>
Last verified: 2026-09-29 · upstream hash matched

Actions Try in browser→

Agents: curl -H "Accept: text/markdown" this URL
→ 262 tokens · Vary: Accept

Critical gotchas

GitHub recommends an Accept: application/vnd.github+json header and an explicit X-GitHub-Api-Version header.

Fine-grained tokens only authorize repositories and permissions selected when the token is created.

cURL

curl -X PATCH 'https://api.github.com/orgs/example-org/properties/installations/values' \  -H "Authorization: Bearer $GITHUB_TOKEN" \  -H 'Accept: application/vnd.github+json' \  -H 'X-GitHub-Api-Version: 2026-03-10' \  -H 'Content-Type: application/json' \  -d '{  "repository_names": [    "example-repository-names"  ],  "properties": [    {      "property_name": "example-property-name",      "value": "example-value"    }  ]}'

Parameters

Name	In	Type	Required	Description
org	path	string	Yes	The organization name. The name is not case sensitive.
repository_names	body	string[]	Yes	The names of repositories that the external custom property values will be applied to.
properties	body	object[]	Yes	List of external custom property names and associated values to apply to the repositories.

Response 200 OK

null

Get a free GitHub API key → sponsored

Affiliate link - we may earn a commission, at no extra cost to you.