Open Science Framework API

Base URL

https://api.osf.io/v2

Authentication

No key needed to read public nodes, registrations and preprints. A free personal access token raises the rate limit and is required for private projects or any write operation.

Rate limit

Anonymous requests are throttled per IP and will return HTTP 429 under sustained use. Authenticated requests with a personal access token get a substantially higher allowance.

Pricing

Free. OSF is run by the non-profit Center for Open Science; individual projects set their own licence, exposed as `node_license`.

CORS

Not enabled — call it from your server

Official docs

Read the docs

Every request below was executed against the live API on 21 Aug 2026, and the response shown is the real body it returned — not an illustration.

curl 'https://api.osf.io/v2/nodes/?page%5Bsize%5D=1'

const res = await fetch("https://api.osf.io/v2/nodes/?page%5Bsize%5D=1");
if (!res.ok) throw new Error(`Request failed: ${res.status}`);
const data = await res.json();
console.log(data);

import requests

res = requests.get("https://api.osf.io/v2/nodes/?page%5Bsize%5D=1", timeout=20)
res.raise_for_status()
print(res.json())

{
  "data": [
    {
      "id": "wmx2h",
      "type": "nodes",
      "attributes": {
        "title": "The effect of anonymity on willingness to testify",
        "description": "",
        "category": "project",
        "custom_citation": null,
        "date_created": "2025-02-05T10:40:56.699961",
        "date_modified": "2026-08-21T07:38:31.695545",
        "registration": false,
        "preprint": false,
        "fork": false,
        "collection": false,
        "tags": [],
        "access_requests_enabled": true,
        "node_license": null,
        "analytics_key": "",
        "current_user_can_comment": false,
        "current_user_permissions": [
          "read"
        ],
        "current_user_is_contributor": false,
        "current_user_is_contributor_or_group_member": false,
        "wiki_enabled": true,
        "public": true,
        "subjects": []
      },
      "relationships": {
        "children": {
          "links": {
            "related": {
              "href": "https://api.osf.io/v2/nodes/wmx2h/children/",
              "meta": {}
            }
          }
        },
        "collected_in": {
          "links": {
            "related": {
              "href": "https://api.osf.io/v2/nodes/wmx2h/collections/",
              "meta": {}
            }
          }
        },
        "comments": {
          "links": {
            "related": {
              "href": "https://api.osf.io/v2/nodes/wmx2h/comments/?filter%5Btarget%5D=wmx2h",
              "meta": {}
            }
          }
        },
        "contributors": {
          "links": {

data[].idstring

The five-character OSF GUID, which is also the public URL path for the project.

data[].typestring

JSON:API resource type — `nodes`, `registrations`, `preprints`, `files` and so on.

attributes.title / descriptionstring

Project title and description as entered by the researchers.

attributes.categorystring

Self-declared project type such as `project`, `data`, `analysis` or `methods and measures`.

attributes.registrationboolean

True for frozen preregistrations, which cannot be edited after submission.

attributes.publicboolean

Whether the node is publicly visible. The anonymous API only ever returns true here.

relationshipsobject

Links to related resources. Follow the `related.href` values, or use `embed` to inline them.

• Harvest preregistrations for a meta-research study
• Mirror a lab's public project list onto its own website
• Monitor a project for new files or contributors
• Cross-reference preprints to their underlying data and materials
• Check whether an analysis plan was registered before data collection

If Open Science Framework does not fit, these science & space apis cover similar ground. Every one was called before publishing, and each links to its own reference page with a working curl command and the response it returned.