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Crates.io

Rust crate metadata from crates.io

🔧 Developer ToolsHEALTHYchecked 9h ago
AUTH NONECORS ✓AGENT ✓HTTPS ✓COMMERCIAL ?

crates.io JSON API for Rust package versions, downloads and dependencies. Read endpoints are keyless — ideal for build tools and dependency dashboards.

90HOW IT'S SCORED ⓘ
▶ Run liveDocs ↗
Status badge · for your READMEshipapis health badge: 90 · healthy
Uptime history
99.02%90 days
100%30 days
458P50 · ms
1317P95 · ms
operationalpartialdownno data
Response time · last 48 checks
Fastest 132 ms, slowest 1027 ms, most recent 760 ms.
Live response samplecaptured by our last successful check
GET https://crates.io/api/v1/crates/serde

{
  "crate": {
    "id": "serde",
    "name": "serde",
    "updated_at": "2025-09-27T16:51:35.265429Z",
    "versions": [
      1748414,
      1746112
    ],
    "keywords": [
      "no_std",
      "serde"
    ],
    "categories": [
      "encoding",
      "no-std"
    ],
    "badges": [],
    "created_at": "2014-12-05T20:20:39.487502Z"
  },
  "versions": [
    {
      "id": 1748414,
      "crate": "serde",
      "num": "1.0.228",
      "dl_path": "/api/v1/crates/serde/1.0.228/download",
      "readme_path": "/api/v1/crates/serde/1.0.228/readme",
      "updated_at": "2025-09-27T16:51:35.265429Z",
      "created_at": "2025-09-27T16:51:35.265429Z",
      "downloads": 324823921
    },
    {
      "id": 1746112,
      "crate": "serde",
      "num": "1.0.227",
      "dl_path": "/api/v1/crates/serde/1.0.227/download",
      "readme_path": "/api/v1/crates/serde/1.0.227/readme",
      "updated_at": "2025-09-25T23:43:08.742811Z",
      "created_at": "2025-09-25T23:43:08.742811Z",
      "downloads": 1665506
    }
  ],
  "keywords": [
    {
      "id": "no_std",
      "keyword": "no_std",
      "created_at": "2015-06-20T04:34:42.753830Z",
      "crates_cnt": 2222
    },
    {
      "id": "serde",
      "keyword": "serde",
      "created_at": "2015-08-10T17:10:09.021436Z",
      "crates_cnt": 1424
    }
  ],
  "categories": [
    {
      "id": "encoding",
      "category": "Encoding",
      "slug": "encoding",
      "description": "Encoding and/or decoding data from one data format to another.",
      "created_at": "2017-01-17T19:13:05.112025Z",
      "crates_cnt": 5871
    },
    {
      "id": "no-std",
      "category": "No standard library",
      "slug": "no-std",
      "description": "Crates that are able to function without the Rust standard library.",
      "created_at": "2017-02-10T01:52:09.447906Z",
      "crates_cnt": 11553
    }
  ]
}
Call itcurl · fetch · python
curl "https://crates.io/api/v1/crates/serde"
const res = await fetch("https://crates.io/api/v1/crates/serde");
const data = await res.json();
console.log(data);
import requests

res = requests.get("https://crates.io/api/v1/crates/serde")
print(res.json())
Endpoints · 5HealthyFULL DOCS ↗
Monitored path responding — GET /crates/serde458 mschecked 9h ago
GET/crates/serdePROBED

Rust crate metadata from crates.io

GET/crates

Crates — documented GET route.

GET/crates/1

Crates details by ID (example: 1).

GET/crates?limit=10

Crates — documented GET route.

GET/crates/search?q=test

Search by query parameters.

Machine-readable spec

We probe a documented GET and expect 2xx JSON — full uptime and health score. Export includes every documented route below.

Response-shape history

Stable. No schema drift observed since monitoring began — the response shape has not changed under our checks.

Crates.io: common questions

Is Crates.io free to use?

Yes — Crates.io is a free developer tools API. Free tier: Free — limits not published. Whether the free tier allows commercial use is unclear — check the provider docs.

Does Crates.io need an API key?

No — Crates.io needs no API key or signup. You can call it straight away; rate limits still apply (Unpublished).

Can I call Crates.io from the browser?

Yes — Crates.io returns CORS headers over HTTPS, so front-end code can fetch it directly with no backend proxy. Use the fetch snippet on this page, or hit "Run live" to try it now.

Is Crates.io up right now?

As of our last scheduled check, Crates.io is healthy with 99.02% uptime over 90 days and a 458 ms median response. We re-probe it every sweep — the status badge and uptime chart above always show the latest.