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import {
BatchCrawlOptions,
AdvancedCrawlConfig,
CrawlEndpointOptions,
CrawlEndpointResponse,
JSExecuteEndpointOptions,
JSExecuteEndpointResponse,
ScreenshotEndpointOptions,
ScreenshotEndpointResponse,
PDFEndpointOptions,
PDFEndpointResponse,
HTMLEndpointOptions,
HTMLEndpointResponse,
MarkdownEndpointOptions,
MarkdownEndpointResponse,
LLMEndpointOptions,
LLMEndpointResponse,
} from './types.js';
// Helper to validate JavaScript code
const validateJavaScriptCode = (code: string): boolean => {
// Check for common HTML entities that shouldn't be in JS
if (/"|&|<|>|&#\d+;|&\w+;/.test(code)) {
return false;
}
// Basic check to ensure it's not HTML
if (/<(!DOCTYPE|html|body|head|script|style)\b/i.test(code)) {
return false;
}
// Check for literal \n, \t, \r outside of strings (common LLM mistake)
// Look for patterns like: ;\n or }\n or )\n which suggest literal newlines
if (/[;})]\s*\\n|\\n\s*[{(/]/.test(code)) {
return false;
}
// Check for obvious cases of literal \n between statements
Iif (/[;})]\s*\\n\s*\w/.test(code)) {
return false;
}
return true;
};
// Helper to validate URL format
const validateURL = (url: string): boolean => {
try {
new URL(url);
return true;
} catch {
return false;
}
};
// Helper to handle axios errors consistently
const handleAxiosError = (error: unknown): never => {
Eif (axios.isAxiosError(error)) {
const axiosError = error as AxiosError;
// Handle timeout errors
if (axiosError.code === 'ECONNABORTED') {
throw new Error('Request timed out');
}
if (axiosError.code === 'ETIMEDOUT') {
throw new Error('Request timeout');
}
// Handle network errors
if (axiosError.code === 'ENOTFOUND') {
throw new Error(`DNS resolution failed: ${axiosError.message}`);
}
if (axiosError.code === 'ECONNREFUSED') {
throw new Error(`Connection refused: ${axiosError.message}`);
}
if (axiosError.code === 'ECONNRESET') {
throw new Error(`Connection reset: ${axiosError.message}`);
}
if (axiosError.code === 'ENETUNREACH') {
throw new Error(`Network unreachable: ${axiosError.message}`);
}
// Handle HTTP errors
if (axiosError.response) {
const status = axiosError.response.status;
const data = axiosError.response.data as any; // eslint-disable-line @typescript-eslint/no-explicit-any
const message = data?.error || data?.detail || data?.message || axiosError.message;
throw new Error(`Request failed with status ${status}: ${message}`);
}
// Handle request errors (e.g., invalid URL)
Eif (axiosError.request) {
throw new Error(`Request failed: ${axiosError.message}`);
}
}
// Re-throw unknown errors
throw error;
};
export class Crawl4AIService {
private axiosClient: AxiosInstance;
constructor(baseURL: string, apiKey: string) {
this.axiosClient = axios.create({
baseURL,
headers: {
'X-API-Key': apiKey,
'Content-Type': 'application/json',
},
timeout: 120000,
});
}
async getMarkdown(options: MarkdownEndpointOptions): Promise<MarkdownEndpointResponse> {
// Validate URL
if (!validateURL(options.url)) {
throw new Error('Invalid URL format');
}
try {
const response = await this.axiosClient.post('/md', {
url: options.url,
f: options.f,
q: options.q,
c: options.c,
});
return response.data;
} catch (error) {
return handleAxiosError(error);
}
}
async captureScreenshot(options: ScreenshotEndpointOptions): Promise<ScreenshotEndpointResponse> {
// Validate URL
if (!validateURL(options.url)) {
throw new Error('Invalid URL format');
}
try {
const response = await this.axiosClient.post('/screenshot', {
url: options.url,
screenshot_wait_for: options.screenshot_wait_for,
// output_path is omitted to get base64 response
});
return response.data;
} catch (error) {
return handleAxiosError(error);
}
}
async generatePDF(options: PDFEndpointOptions): Promise<PDFEndpointResponse> {
// Validate URL
if (!validateURL(options.url)) {
throw new Error('Invalid URL format');
}
try {
const response = await this.axiosClient.post('/pdf', {
url: options.url,
// output_path is omitted to get base64 response
});
return response.data;
} catch (error) {
return handleAxiosError(error);
}
}
async executeJS(options: JSExecuteEndpointOptions): Promise<JSExecuteEndpointResponse> {
// Validate URL
if (!validateURL(options.url)) {
throw new Error('Invalid URL format');
}
// Ensure scripts is always an array
const scripts = Array.isArray(options.scripts) ? options.scripts : [options.scripts];
// Validate each script
for (const script of scripts) {
if (!validateJavaScriptCode(script)) {
throw new Error(
'Invalid JavaScript: Contains HTML entities ("), literal \\n outside strings, or HTML tags. Use proper JS syntax with real quotes and newlines.',
);
}
}
try {
const response = await this.axiosClient.post('/execute_js', {
url: options.url,
scripts: scripts, // Always send as array
// Only url and scripts are supported by the endpoint
});
return response.data;
} catch (error) {
return handleAxiosError(error);
}
}
async batchCrawl(options: BatchCrawlOptions) {
// Validate URLs
if (!options.urls || options.urls.length === 0) {
throw new Error('URLs array cannot be empty');
}
// Build crawler config if needed
const crawler_config: Record<string, unknown> = {};
// Handle remove_images by using exclude_tags
if (options.remove_images) {
crawler_config.exclude_tags = ['img', 'picture', 'svg'];
}
if (options.bypass_cache) {
crawler_config.cache_mode = 'BYPASS';
}
try {
const response = await this.axiosClient.post('/crawl', {
urls: options.urls,
max_concurrent: options.max_concurrent,
crawler_config: Object.keys(crawler_config).length > 0 ? crawler_config : undefined,
});
return response.data;
} catch (error) {
return handleAxiosError(error);
}
}
async getHTML(options: HTMLEndpointOptions): Promise<HTMLEndpointResponse> {
// Validate URL
if (!validateURL(options.url)) {
throw new Error('Invalid URL format');
}
try {
const response = await this.axiosClient.post('/html', {
url: options.url,
// Only url is supported by the endpoint
});
return response.data;
} catch (error) {
return handleAxiosError(error);
}
}
async parseSitemap(url: string) {
try {
// Use axios directly without baseURL for fetching external URLs
const response = await axios.get(url);
return response.data;
} catch (error) {
return handleAxiosError(error);
}
}
async detectContentType(url: string): Promise<string> {
try {
// Use axios directly without baseURL for external URLs
const response = await axios.head(url);
return response.headers['content-type'] || '';
} catch {
return '';
}
}
async crawl(options: AdvancedCrawlConfig): Promise<CrawlEndpointResponse> {
// Validate JS code if present
if (options.crawler_config?.js_code) {
const scripts = Array.isArray(options.crawler_config.js_code)
? options.crawler_config.js_code
: [options.crawler_config.js_code];
for (const script of scripts) {
if (!validateJavaScriptCode(script)) {
throw new Error(
'Invalid JavaScript: Contains HTML entities ("), literal \\n outside strings, or HTML tags. Use proper JS syntax with real quotes and newlines.',
);
}
}
}
// Server only accepts urls array, not url string
const urls = options.url ? [options.url] : options.urls || [];
const requestBody: CrawlEndpointOptions = {
urls,
browser_config: options.browser_config,
crawler_config: options.crawler_config || {}, // Always include crawler_config, even if empty
};
try {
const response = await this.axiosClient.post('/crawl', requestBody);
return response.data;
} catch (error) {
return handleAxiosError(error);
}
}
async extractWithLLM(options: LLMEndpointOptions): Promise<LLMEndpointResponse> {
// Validate URL
Iif (!validateURL(options.url)) {
throw new Error('Invalid URL format');
}
try {
const encodedUrl = encodeURIComponent(options.url);
const encodedQuery = encodeURIComponent(options.query);
const response = await this.axiosClient.get(`/llm/${encodedUrl}?q=${encodedQuery}`);
return response.data;
} catch (error) {
// Special handling for LLM-specific errors
Eif (axios.isAxiosError(error)) {
const axiosError = error as AxiosError;
Iif (axiosError.code === 'ECONNABORTED' || axiosError.response?.status === 504) {
throw new Error('LLM extraction timed out. Try a simpler query or different URL.');
}
if (axiosError.response?.status === 401) {
throw new Error(
'LLM extraction failed: No LLM provider configured on server. Please ensure the server has an API key set.',
);
}
}
return handleAxiosError(error);
}
}
}
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