Repository: FlowiseAI/Flowise
File: packages/components/nodes/documentloaders/Folder/Folder.ts (TypeScript)

Code before:
            },
            {
                label: 'Additional File Loaders',
                name: 'additionalLoaders',
                type: 'json',
                optional: true,
                additionalParams: true
            }
        ]
    }

    async init(nodeData: INodeData): Promise<any> {
        const textSplitter = nodeData.inputs?.textSplitter as TextSplitter
        const folderPath = nodeData.inputs?.folderPath as string
        const metadata = nodeData.inputs?.metadata
        const additionalLoaders = nodeData.inputs?.additionalLoaders
        const parsedLoaders = additionalLoaders ? ( typeof metadata === 'object' ? additionalLoaders: JSON.parse( additionalLoaders ) ) : []

        const loader = new DirectoryLoader(folderPath, {
            '.json': (path) => new JSONLoader(path),
            '.txt': (path) => new TextLoader(path),
            '.csv': (path) => new CSVLoader(path),
            '.docx': (path) => new DocxLoader(path),
            // @ts-ignore
            '.pdf': (path) => new PDFLoader(path, { pdfjs: () => import('pdf-parse/lib/pdf.js/v1.10.100/build/pdf.js') }),
            ...parsedLoaders
        })
        let docs = []

        if (textSplitter) {
            docs = await loader.loadAndSplit(textSplitter)
        } else {
            docs = await loader.load()
        }

        if (metadata) {
            const parsedMetadata = typeof metadata === 'object' ? metadata : JSON.parse(metadata)
            let finaldocs = []
            for (const doc of docs) {
                const newdoc = {
                    ...doc,
                    metadata: {
                        ...doc.metadata,
                        ...parsedMetadata
                    }
                }
                finaldocs.push(newdoc)
            }
            return finaldocs
        }


Review comment (suggestion):
I don't think it will work. Because you need specific loader for specific file types, otherwise if let's say you have a file with extension `.ppt`, there is no loader to process the file

Code after:
            }
        ]
    }

    async init(nodeData: INodeData): Promise<any> {
        const textSplitter = nodeData.inputs?.textSplitter as TextSplitter
        const folderPath = nodeData.inputs?.folderPath as string
        const metadata = nodeData.inputs?.metadata

        const loader = new DirectoryLoader(folderPath, {
            '.json': (path) => new JSONLoader(path),
            '.txt': (path) => new TextLoader(path),
            '.csv': (path) => new CSVLoader(path),
            '.docx': (path) => new DocxLoader(path),
            // @ts-ignore
            '.pdf': (path) => new PDFLoader(path, { pdfjs: () => import('pdf-parse/lib/pdf.js/v1.10.100/build/pdf.js') }),
            '.aspx': (path) => new TextLoader(path),
            '.asp': (path) => new TextLoader(path),
            '.cpp': (path) => new TextLoader(path), // C++
            '.c': (path) => new TextLoader(path),
            '.cs': (path) => new TextLoader(path),
            '.css': (path) => new TextLoader(path),
            '.go': (path) => new TextLoader(path), // Go
            '.h': (path) => new TextLoader(path), // C++ Header files
            '.java': (path) => new TextLoader(path), // Java
            '.js': (path) => new TextLoader(path), // JavaScript
            '.less': (path) => new TextLoader(path), // Less files
            '.ts': (path) => new TextLoader(path), // TypeScript
            '.php': (path) => new TextLoader(path), // PHP
            '.proto': (path) => new TextLoader(path), // Protocol Buffers
            '.python': (path) => new TextLoader(path), // Python
            '.py': (path) => new TextLoader(path), // Python
            '.rst': (path) => new TextLoader(path), // reStructuredText
            '.ruby': (path) => new TextLoader(path), // Ruby
            '.rb': (path) => new TextLoader(path), // Ruby
            '.rs': (path) => new TextLoader(path), // Rust
            '.scala': (path) => new TextLoader(path), // Scala
            '.sc': (path) => new TextLoader(path), // Scala
            '.scss': (path) => new TextLoader(path), // Sass
            '.sol': (path) => new TextLoader(path), // Solidity
            '.sql': (path) => new TextLoader(path), //SQL
            '.swift': (path) => new TextLoader(path), // Swift
            '.markdown': (path) => new TextLoader(path), // Markdown
            '.md': (path) => new TextLoader(path), // Markdown
            '.tex': (path) => new TextLoader(path), // LaTeX
            '.ltx': (path) => new TextLoader(path), // LaTeX
            '.html': (path) => new TextLoader(path), // HTML
            '.vb': (path) => new TextLoader(path), // Visual Basic
            '.xml': (path) => new TextLoader(path) // XML
        })
        let docs = []