API · /openvsx-api

Open VSX API

healthy 4,915 Subscribers

The open VS Code extension registry — Open VSX — as an API. Open VSX is the vendor-neutral marketplace behind VSCodium, Gitpod, Eclipse Theia, Cursor and many other editors. Look up any extension by its namespace.name id for its display name and description, latest version, publisher, total download count, average rating, license, categories and tags, repository and homepage links, and the exact `code --install-extension` command; read an extension's full version history; and search the registry by keyword, ranked by downloads. Covers the editor-extension ecosystem from Python, Java and ESLint to Prettier, GitLens and the major themes and language packs. Live from the official open-vsx.org API. Ideal for editor and IDE tooling, extension catalogs and dashboards, and developer-portal integrations. Open data from Open VSX.

#open-vsx #vscode #extensions #editor #developer-tools #registry

api.oanor.com/openvsx-api

Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/openvsx-api/openapi.json

/api/openvsx-api/llms.txt

Discovery: GET /api/index.json lists every API.

Open VSX API — live data on the oanor API marketplace

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 133 ms; Server probes · 24h
Subscribers: 4,915; active
Total calls: 76; last 7 days

Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

3,590 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
3,590 calls/month
2 req/sec
Extension + versions + search
No credit card

Starter

€4.35 /month

47,700 calls / month
8 requests / second
Hard cap (429 above quota, no overage)
47.7k calls/month
8 req/sec
Downloads + ratings
Email support

Pro

€12.95 /month

235,000 calls / month
20 requests / second
Hard cap (429 above quota, no overage)
235k calls/month
20 req/sec
Editor / IDE tooling
Priority support

Mega

€34.45 /month

1,188,000 calls / month
50 requests / second
Hard cap (429 above quota, no overage)
1.19M calls/month
50 req/sec
Extension-data platform
Dedicated SLA

Built by

PremiumApi

Related APIs

Other APIs with overlapping tags.

Mozilla Add-ons (Firefox Extensions) API

Live Firefox add-on stats from the official Mozilla Add-ons (AMO) API — no key, nothing stored. The adoption-and-reputation view of the Firefox ecosystem: how many users an extension or theme has, how it is rated and reviewed, and which add-ons are most popular, distinct from the other developer-ecosystem and package APIs in the catalogue. The addon endpoint returns a single add-on in full — its average daily users, weekly downloads, the star rating with review count, authors, version, type and categories. The search endpoint searches add-ons sortable by users, rating or relevance, each with its user count and rating. The top endpoint returns the most-used add-ons, optionally filtered to extensions or themes. Build extension-popularity dashboards, "is this add-on still maintained and trusted" widgets, competitor trackers and developer-portfolio tools on top of real Mozilla Add-ons data. Look up an add-on by its slug (ublock-origin, darkreader); average daily users is the headline popularity metric and the rating is the community reputation.

api.oanor.com/mozillaaddons-api

Programming Languages API

The language definitions GitHub uses to recognise code (the open-source Linguist data) as an API — a clean reference for syntax highlighting, file-type detection, repository dashboards and developer tooling. For each of 800+ languages the API returns its type (programming, markup, data or prose), its brand colour (the hex GitHub paints it), the file extensions associated with it, common aliases, the GitHub language id and the editor (ace) mode. Look a language up by name or alias (golang resolves to Go), reverse-look-up which language(s) own a file extension (.py → Python; .h → C, C++, Objective-C), list the languages of a type, search, or list them all. Distinct from languages-api (ISO 639 human languages) — this is the programming-language reference. Served from memory — always fast.

api.oanor.com/proglang-api

MIME Types API

The canonical MIME / media-type database (the jshttp mime-db used by Express and most of the Node ecosystem: IANA + Apache + nginx), served from memory — no key. Resolve a media type to its file extensions, charset and compressibility; reverse-lookup the media type(s) for a file extension (e.g. png → image/png); and search or list types by source. 2,600+ media types, 1,000+ with file extensions. Lean, predictable JSON. Ideal for upload validation, Content-Type resolution, file-type detection, download handlers and developer tooling.

api.oanor.com/mimetypes-api

MusicBrainz API

The open music-metadata database as an API — artists, release-groups (albums), releases, recordings and labels, identified by stable MusicBrainz IDs (MBIDs), returned as clean JSON. Search any entity by name or Lucene query; look up an artist with their external links and tags, an album, a release with its full track list, a recording with its ISRCs, or a label; and browse an artist's complete discography. Live data with MBIDs, disambiguations, types, countries, life spans, ISRCs, barcodes, catalogue numbers and relations — the canonical identifiers that link and de-duplicate music data across services. Ideal for metadata enrichment and matching, music catalogues, tagging and library tools, and research. 11 data endpoints. Authenticated with an x-oanor-key; fair-use rate limits per plan.

api.oanor.com/musicbrainz-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Open VSX API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Open VSX API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Open VSX API?

Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.

How much does Open VSX API cost?

Open VSX API has a free tier with 100 calls / month. Paid plans start at €4.35 / month with higher quotas and faster rate limits.

Can I cancel my subscription anytime?

Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.

Is Open VSX API GDPR-compliant?

All requests to Open VSX API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Open VSX 3

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/extension

Extension metadata

Playground

Parameters

Custom headers

Language: Client:

GET /v1/search

Search the registry

Playground

Parameters

Custom headers

Language: Client:

GET /v1/versions

Version history

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Source & options

Playground

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/openvsx-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/openvsx-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/openvsx-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);

import requests
r = requests.get(
    "https://api.oanor.com/openvsx-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

Ratings

No reviews yet.

Discussion

Ask questions, share usage tips, get answers from the provider and other developers. Public — anyone can read.

New thread

📌 Pinned 🔒 Locked

· ·

🔒 This thread is locked — no new replies.

No threads yet — start the discussion.

Support

Private 1:1 support with the provider — billing questions, integration issues, account problems. Only you and the provider team can see these threads.

Open new ticket

Describe what you need help with. The provider team gets an email and replies on the ticket page.

No tickets yet for this API.

Subscription active — calls can start immediately.

Send your first request —

Subscription active — copy a snippet and fire off your first call.

Pick a key

Plaintext is shown once at creation — use the prefix as a reminder.

Open VSX API

API health

Pricing

Built by

Related APIs

Mozilla Add-ons (Firefox Extensions) API

Programming Languages API

MIME Types API

MusicBrainz API

Frequently asked questions

Parameters

Parameters

Parameters

Code snippets

Ratings

Discussion

New thread

📌 🔒

Support

Open new ticket

Your cookie choices