# Junior Guru Job Scraper Demo (`katerinahronik/junior-guru-job-scraper-demo`) Actor

Demo Actor scraper for junior.guru talk.

- **URL**: https://apify.com/katerinahronik/junior-guru-job-scraper-demo.md
- **Developed by:** [Kateřina Hroníková](https://apify.com/katerinahronik) (community)
- **Categories:** Automation, Jobs
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, NaN bookmarks
- **User rating**: No ratings yet

## Pricing

Pay per usage

This Actor is paid per platform usage. The Actor is free to use, and you only pay for the Apify platform usage, which gets cheaper the higher subscription plan you have.

Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-usage

## What's an Apify Actor?

Actors are a software tools running on the Apify platform, for all kinds of web data extraction and automation use cases.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
The best way to integrate Actors is as follows.

In JavaScript/TypeScript projects, use official [JavaScript/TypeScript client](https://docs.apify.com/api/client/js.md):

```bash
npm install apify-client
```

In Python projects, use official [Python client library](https://docs.apify.com/api/client/python.md):

```bash
pip install apify-client
```

In shell scripts, use [Apify CLI](https://docs.apify.com/cli/docs.md):

````bash
# MacOS / Linux
curl -fsSL https://apify.com/install-cli.sh | bash
# Windows
irm https://apify.com/install-cli.ps1 | iex
```bash

In AI frameworks, you might use the [Apify MCP server](https://docs.apify.com/platform/integrations/mcp.md).

If your project is in a different language, use the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).


# README

## StartupJobs.cz demo scraper

An [Apify Actor](https://apify.com/actors) that collects developers job listings from [StartupJobs.cz](https://www.startupjobs.cz) using their public API.

Built as a live demo for the [junior.guru](https://junior.guru) community talk *"Web scraping: Nechte internet pracovat za vás"*.

---

### What does it do?

You give it a keyword (e.g. `junior`, `python`, `javascript`) and it returns a list of matching developer/engineer job offers including title, company, location, salary, and a direct link. Non-tech roles (sales, marketing, etc.) are filtered out automatically.

Results are stored in an Apify Dataset and can be exported to **CSV**, **JSON**, or other formats in one click.

---

### Prerequisites

- [Apify account](https://console.apify.com) (free tier is enough)
- Node.js 18+
- [Apify CLI](https://docs.apify.com/cli/)

```bash
npm install -g apify-cli
apify login
````

***

### Step 1 — Find the API using DevTools

Before writing any code, open [startupjobs.cz/nabidky](https://www.startupjobs.cz/nabidky) in your browser and explore how it loads data.

1. Press **F12** to open DevTools
2. Go to the **Network** tab
3. Filter by **Fetch/XHR**
4. Reload the page or type a keyword in the search box
5. Look for a request to `/api/offers`

You'll see something like:

```
GET https://www.startupjobs.cz/api/offers?keyword=junior&limit=20&page=1
```

Open it in a new tab — you get clean JSON back. No HTML parsing needed. 🎉

```json
{
  "resultSet": [
    {
      "name": "Junior TypeScript Developer",
      "company": "Acme s.r.o.",
      "url": "/nabidka/12345/junior-typescript-developer",
      "locations": "Praha",
      "isRemote": true,
      "seniorities": ["junior"],
      "areaSlugs": ["back-end-vyvojar", "vyvoj"],
      "salary": { "min": 40000, "max": 60000, "currency": "CZK", "measure": "monthly" }
    }
  ]
}
```

***

### Step 2 — Walk through the code

The entire actor is in [`src/main.ts`](src/main.ts). Here's what it does:

```typescript
await Actor.init();
const { keyword = '', seniority = '', maxResults = 50 } = await Actor.getInput() ?? {};

while (collected < maxResults) {
    // 1. Call the StartupJobs API — plain fetch(), JSON response
    const response = await fetch(`${API_URL}?keyword=${keyword}&page=${page}`);
    const { resultSet: offers } = await response.json();

    for (const offer of offers) {
        // 2. Skip non-developer roles (sales, marketing, etc.) and wrong seniority
        const isDevRole = offer.areaSlugs.some((slug) => DEV_AREA_SLUGS.has(slug));
        const isSeniorityMatch = !seniority || offer.seniorities.includes(seniority);
        if (!isDevRole || !isSeniorityMatch) continue;

        // 3. Pick the fields we care about and save to Apify Dataset
        await Actor.pushData({
            title: offer.name,
            company: offer.company,
            url: `${BASE_URL}${offer.url}`,
            // ...
        });
    }
}
```

Three concepts, that's it: **fetch → filter → save**.

StartupJobs has a clean API, so we get JSON directly. If it didn't, we'd have to fetch the HTML page and extract data from it using CSS selectors — this is called **parsing**:

```typescript
// Without an API you'd do something like this instead:
import * as cheerio from 'cheerio';

const response = await fetch('https://www.startupjobs.cz/nabidky?q=javascript');
const html = await response.text();        // raw HTML string, not JSON
const $ = cheerio.load(html);              // parse the HTML

$('.offer-title').each((_, el) => {        // find all elements matching a CSS selector
    const title = $(el).text().trim();     // extract the text content
    const url = $(el).attr('href');        // or an attribute
    console.log(title, url);
});
```

HTML structure changes whenever the site redesigns — APIs are much more stable.

***

### Step 3 — Run locally

```bash
## Install dependencies
npm install

## Run without building (great for development)
npm run dev

## Or build first, then run
npm run build
npm start
```

To set a custom keyword, create `storage/key_value_stores/default/INPUT.json`:

```json
{
  "keyword": "javascript",
  "seniority": "junior",
  "maxResults": 20
}
```

***

### Step 4 — Deploy to Apify

```bash
apify push
```

Your actor is now live at [console.apify.com](https://console.apify.com/actors) under **My Actors**.

***

### Step 5 — Schedule & export

**Run on a schedule** — e.g. every morning at 8:00:

1. Open your actor in Apify Console
2. Go to **Schedules** → **+ New Schedule**
3. Set cron: `0 8 * * 1-5` (Mon–Fri at 8:00)

**Export results:**

- Dataset → **Export** → CSV / JSON
- Or connect directly to **Gmail** via [Apify integrations](https://docs.apify.com/platform/integrations/gmail)

***

### Build your own scraper

Want to scrape a different site? You can use this repo as a starting point.

1. **Pick your starting point** based on what the target site looks like:

   | Situation | Template |
   |---|---|
   | Site has a JSON API (like this demo) | Clone this repo |
   | No API, static HTML | `ts-crawlee-cheerio` |
   | No API, heavy JavaScript / dynamic content | `ts-crawlee-playwright` |

   ```bash
   apify create my-scraper --template ts-crawlee-cheerio
   ```

2. **Find the data source** — open the target site in your browser, go to DevTools → Network → Fetch/XHR, and look for an API call returning JSON. If there's no API, switch to the Elements tab and find the CSS selectors for the data you need.

3. **Edit `src/main.ts`** — replace the `fetch()` URL and the fields inside `Actor.pushData({...})` with whatever your target API or page returns. The structure stays the same: fetch → filter → save.

4. **Update `.actor/input_schema.json`** to define the inputs your scraper needs (keywords, URLs, limits, etc.).

5. **Run locally** with `npm run dev`, then deploy with `apify push`.

The Apify [documentation](https://docs.apify.com/sdk/js) and [Academy](https://docs.apify.com/academy/web-scraping-for-beginners) are great next steps from here.

***

### Going further

| What | How |
|---|---|
| Compare day-over-day | Store results with a timestamp, diff on next run |
| Scrape a JS-heavy site | Switch to `PlaywrightCrawler` from Crawlee |
| Browse 29 000+ ready-made scrapers | [apify.com/store](https://apify.com/store) |

***

### Glossary

**Web scraping** — Automatically collecting data from websites by sending requests and extracting the relevant parts from the response (HTML or JSON).

**Server** — A computer (or program) that listens for requests over the internet and sends back a response. When you open a website, your browser sends a request to a server, which replies with the page content.

**API (Application Programming Interface)** — A formal agreement between two programs on how to exchange data: what you can ask for, how to ask it, and what format the answer comes back in. This scraper uses StartupJobs' public API, which means we get clean JSON instead of having to dig through HTML.

**Parsing** — Analyzing and processing structured text (HTML or JSON) to pull out specific pieces of data. When a site has no API, you parse the raw HTML to find what you need.

**JS site (JavaScript-rendered site)** — A site that builds its content in the browser using JavaScript. A plain HTTP request returns only an empty shell — the actual data isn't in the source HTML at all. You need a headless browser to load these properly.

**Headless browser** — A web browser that runs without a visible window. It works exactly like a normal browser (loads pages, runs JavaScript, processes CSS), but everything happens in memory in the background. Used to scrape JS-rendered sites.

**LLM (Large Language Model)** — A type of AI trained on massive amounts of text, capable of understanding and generating human-like language. In scraping, LLMs can help extract or structure data from unstructured text that would be hard to parse with code alone.

**Proxy** — An intermediary server between you and the target website. Your requests go through it, so the website sees the proxy's IP address instead of yours. Used to avoid IP bans when scraping at scale.

***

### Resources

- [Apify SDK for JavaScript/TypeScript](https://docs.apify.com/sdk/js)
- [Apify Academy — Web scraping for beginners](https://docs.apify.com/academy/web-scraping-for-beginners)
- [junior.guru](https://junior.guru) — community and handbook for junior developers in CZ/SK
- [Talk slides](https://docs.google.com/presentation/d/1wspqGNs5wx_i-V9UjuokDIbepCueCm0D2KmenmDWBjo/edit?usp=sharing)

# Actor input Schema

## `keyword` (type: `string`):

Technology or role to search for on StartupJobs.cz (e.g. 'python', 'javascript', 'react'). Leave empty to return all developer positions.

## `seniority` (type: `string`):

Filter by seniority level. Leave empty to return all levels.

## `maxResults` (type: `integer`):

Maximum number of job listings to collect

## Actor input object example

```json
{
  "keyword": "",
  "seniority": "",
  "maxResults": 50
}
```

# Actor output Schema

## `results` (type: `string`):

No description

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {};

// Run the Actor and wait for it to finish
const run = await client.actor("katerinahronik/junior-guru-job-scraper-demo").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = {}

# Run the Actor and wait for it to finish
run = client.actor("katerinahronik/junior-guru-job-scraper-demo").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"])
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{}' |
apify call katerinahronik/junior-guru-job-scraper-demo --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://mcp.apify.com/?tools=katerinahronik/junior-guru-job-scraper-demo",
                "--header",
                "Authorization: Bearer <YOUR_API_TOKEN>"
            ]
        }
    }
}

```

## OpenAPI specification

```json
{
    "openapi": "3.0.1",
    "info": {
        "title": "Junior Guru Job Scraper Demo",
        "description": "Demo Actor scraper for junior.guru talk.",
        "version": "0.0",
        "x-build-id": "z3WPTSxZQtxCJjKmh"
    },
    "servers": [
        {
            "url": "https://api.apify.com/v2"
        }
    ],
    "paths": {
        "/acts/katerinahronik~junior-guru-job-scraper-demo/run-sync-get-dataset-items": {
            "post": {
                "operationId": "run-sync-get-dataset-items-katerinahronik-junior-guru-job-scraper-demo",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor, waits for its completion, and returns Actor's dataset items in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK"
                    }
                }
            }
        },
        "/acts/katerinahronik~junior-guru-job-scraper-demo/runs": {
            "post": {
                "operationId": "runs-sync-katerinahronik-junior-guru-job-scraper-demo",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor and returns information about the initiated run in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/runsResponseSchema"
                                }
                            }
                        }
                    }
                }
            }
        },
        "/acts/katerinahronik~junior-guru-job-scraper-demo/run-sync": {
            "post": {
                "operationId": "run-sync-katerinahronik-junior-guru-job-scraper-demo",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor, waits for completion, and returns the OUTPUT from Key-value store in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK"
                    }
                }
            }
        }
    },
    "components": {
        "schemas": {
            "inputSchema": {
                "type": "object",
                "properties": {
                    "keyword": {
                        "title": "Search keyword",
                        "type": "string",
                        "description": "Technology or role to search for on StartupJobs.cz (e.g. 'python', 'javascript', 'react'). Leave empty to return all developer positions.",
                        "default": ""
                    },
                    "seniority": {
                        "title": "Seniority",
                        "enum": [
                            "",
                            "junior",
                            "medior",
                            "senior"
                        ],
                        "type": "string",
                        "description": "Filter by seniority level. Leave empty to return all levels.",
                        "default": ""
                    },
                    "maxResults": {
                        "title": "Max results",
                        "minimum": 1,
                        "maximum": 500,
                        "type": "integer",
                        "description": "Maximum number of job listings to collect",
                        "default": 50
                    }
                }
            },
            "runsResponseSchema": {
                "type": "object",
                "properties": {
                    "data": {
                        "type": "object",
                        "properties": {
                            "id": {
                                "type": "string"
                            },
                            "actId": {
                                "type": "string"
                            },
                            "userId": {
                                "type": "string"
                            },
                            "startedAt": {
                                "type": "string",
                                "format": "date-time",
                                "example": "2025-01-08T00:00:00.000Z"
                            },
                            "finishedAt": {
                                "type": "string",
                                "format": "date-time",
                                "example": "2025-01-08T00:00:00.000Z"
                            },
                            "status": {
                                "type": "string",
                                "example": "READY"
                            },
                            "meta": {
                                "type": "object",
                                "properties": {
                                    "origin": {
                                        "type": "string",
                                        "example": "API"
                                    },
                                    "userAgent": {
                                        "type": "string"
                                    }
                                }
                            },
                            "stats": {
                                "type": "object",
                                "properties": {
                                    "inputBodyLen": {
                                        "type": "integer",
                                        "example": 2000
                                    },
                                    "rebootCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "restartCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "resurrectCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "computeUnits": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            },
                            "options": {
                                "type": "object",
                                "properties": {
                                    "build": {
                                        "type": "string",
                                        "example": "latest"
                                    },
                                    "timeoutSecs": {
                                        "type": "integer",
                                        "example": 300
                                    },
                                    "memoryMbytes": {
                                        "type": "integer",
                                        "example": 1024
                                    },
                                    "diskMbytes": {
                                        "type": "integer",
                                        "example": 2048
                                    }
                                }
                            },
                            "buildId": {
                                "type": "string"
                            },
                            "defaultKeyValueStoreId": {
                                "type": "string"
                            },
                            "defaultDatasetId": {
                                "type": "string"
                            },
                            "defaultRequestQueueId": {
                                "type": "string"
                            },
                            "buildNumber": {
                                "type": "string",
                                "example": "1.0.0"
                            },
                            "containerUrl": {
                                "type": "string"
                            },
                            "usage": {
                                "type": "object",
                                "properties": {
                                    "ACTOR_COMPUTE_UNITS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_WRITES": {
                                        "type": "integer",
                                        "example": 1
                                    },
                                    "KEY_VALUE_STORE_LISTS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_INTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_EXTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_RESIDENTIAL_TRANSFER_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_SERPS": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            },
                            "usageTotalUsd": {
                                "type": "number",
                                "example": 0.00005
                            },
                            "usageUsd": {
                                "type": "object",
                                "properties": {
                                    "ACTOR_COMPUTE_UNITS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_WRITES": {
                                        "type": "number",
                                        "example": 0.00005
                                    },
                                    "KEY_VALUE_STORE_LISTS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_INTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_EXTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_RESIDENTIAL_TRANSFER_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_SERPS": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}
```