Codeforces

Get access to Codeforces data

Open documentation ↗

API keyHTTPSNo CORSProgramming

Verified today: 100% uptime

API key

Required

HTTPS

Supported

Browser calls

No, needs a proxy

Status

Live · 100/100

Overview & Architectural Role

Codeforces provides programmatic access to get access to codeforces data. Delivered over secure HTTPS protocols, it exposes structured endpoints designed to integrate cleanly into modern frontend frameworks, backend microservices, and automated data pipelines without requiring local database provisioning.

Who it is built for

Engineers building web dashboards, mobile applications, CLI utilities, or background cron workers in need of reliable programming data feeds.

Architectural Advantage

Consuming Codeforces removes the operational overhead of running custom scrapers, orchestrating headless browser fleets, or manually seeding and maintaining a local database. Instead of reverse-engineering volatile DOM layouts or dealing with anti-bot IP blocks, your application connects directly to a standardized JSON interface designed for backend ingestion with consistent schema schemas. Dedicated authentication ensures rate quotas and credential tracking per project environment.

What our checks found

Health score: 100/100
Reliability: 100%
Average latency: 1124ms

Last checked 2026-10-24. Measured independently, not self-reported by the provider.

Core Use Cases & Architecture Ideas

Practical real-world patterns for integrating Codeforces into software systems.

Automated SaaS Feature Integration

Embed data and functionality from Codeforces directly into application onboarding, profile enrichment, or reporting dashboards.

Architecture: Backend service worker fetches Codeforces during user workflows, caches responses in Redis, and hydrates UI state.

Scheduled Reporting & Monitoring Bot

Periodically extract updates from Codeforces to generate daily digests, analytics reports, or Slack notifications.

Architecture: A scheduled GitHub Action or cron worker executes a lightweight script calling Codeforces, formatting markdown summaries for stakeholders.

Rapid Prototyping & Hackathon Showcase

Provide real-world mock data and operational endpoints for client demos, portfolio apps, or MVP validation.

Architecture: Static client SPA queries Codeforces directly to populate mock dashboards, graphs, and interactive UI states without a custom backend.

Code Implementation Examples

Production-ready starting templates with error handling for Codeforces.

// Requires an API key. Check the docs for whether it goes in a header or a query parameter.
// Modern native fetch with error handling
async function callApi() {
  try {
    const response = await fetch('https://codeforces.com/api/v1/resource', {
      method: 'GET',
    headers: {
      'Authorization': 'Bearer YOUR_API_KEY',
      Accept: 'application/json',
    },
    });

    if (!response.ok) {
      throw new Error(`HTTP ${response.status}: ${response.statusText}`);
    }

    const data = await response.json();
    console.log('Response payload:', data);
    return data;
  } catch (error) {
    console.error('API request failed:', error);
    throw error;
  }
}

// callApi();

This API does not send CORS headers, so a browser will block a direct call from your front end. Call it from your server, or put a small proxy in front of it.

Response Payload & Live Testing

Inspect the expected JSON structure returned by Codeforces.

Expected JSON Response Payload

Authentic sample payload structure to evaluate schema attributes before integration.

{
  "status": 200,
  "api": "Codeforces",
  "endpoint": "/codeforces",
  "data": {
    "id": 101,
    "title": "Codeforces Sample Payload",
    "description": "Get access to Codeforces data",
    "verified": true,
    "category": "Programming",
    "updated_at": "2026-10-24T07:39:09.269Z"
  },
  "meta": {
    "response_time_ms": 1124,
    "cached": false
  }
}

Format: application/json

Integration Considerations & Best Practices

Technical factors to keep in mind when integrating Codeforces into production environments.

Implement In-Memory or Edge Caching

Avoid triggering rate limits on public feeds by caching response payloads in Redis, Vercel KV, or standard HTTP Cache-Control headers with a 5-to-15 minute TTL.

Shield Credentials in Backend Route Handlers

Never expose private API keys in client-side JavaScript or bundle environments. Proxy requests through a Next.js API route or serverless backend to keep secret keys out of public DevTools inspection.

CORS Proxy Required for Browser Frontend Calls

This API does not send Access-Control-Allow-Origin response headers. Direct fetch() calls from browser JavaScript will fail due to Same-Origin Policy. Route your calls through a server backend or lightweight edge proxy.

Validate HTTP Status Before Parsing JSON

Always inspect response.ok before executing response.json(). Upstream services returning 4xx or 502 Bad Gateway often serve HTML error pages, which cause syntax errors when parsed as JSON.

Where this listing comes from

Aggregated from one public source (public-apis), then normalised and checked by us.

Report an issue with this listing ↗

Other Programming APIs

See all 5 →

Judge0 CE

Programming

Online code execution system

API keyCORSHTTPS

Verified today: 100% uptime

View Details

Hackerearth

Programming

For compiling and running code in several languages

API keyHTTPS

Verified today: 100% uptime

View Details

Mintlify

Programming

For programmatically generating documentation for code

API keyHTTPS

Verified today: 100% uptime

View Details

KONTESTS

Programming

For upcoming and ongoing competitive coding contests

No keyHTTPS

Checked today: not responding

View Details

Codeforces — common questions

Answered from what our own scheduled checks found, not from the provider's marketing.

Is Codeforces free to use?

Codeforces is listed in our free catalogue, but it requires an API key, so you will need to register before your first call. Providers frequently reserve higher limits and commercial use for paid plans.

Does Codeforces need an API key?

Yes. Codeforces authenticates with an API key. Keep it server-side rather than in browser code, because anything in your frontend bundle is readable by anyone who opens developer tools.

Can I call Codeforces from browser JavaScript?

Not directly. Codeforces did not return CORS headers when we checked, so the browser will block your page from reading the response even though the request itself succeeds. Call it from a server, or put a small proxy in front of it.

Is Codeforces still working?

Yes, as of 2026-10-24. Our automated check reached Codeforces and recorded a 100% reliability score with a median response time of 1124 ms. We re-check on a schedule, and this page updates with the result.

Is Codeforces available over HTTPS?

Yes. Codeforces serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.