Switch from node-pdflatex to external LaTeX API (latexbase.com)

app/api/data/route.ts

@@ -2,7 +2,6 @@ import { NextRequest, NextResponse } from 'next/server'
 import fs from 'fs'
 import path from 'path'
 import { writeFile, mkdir, unlink, readdir, stat } from 'fs/promises'
-import pdflatex from 'node-pdflatex'
 
 // Use /data for Hugging Face Spaces persistent storage, fallback to public/data for local dev
 const DATA_DIR = process.env.SPACE_ID
@@ -123,28 +122,59 @@ export async function POST(request: NextRequest) {
 
                 // Auto-convert .tex files to PDF
                 if (fileName.endsWith('.tex')) {
-                    console.log('✨ Detected .tex file, auto-converting to PDF using node-pdflatex...')
+                    console.log('✨ Detected .tex file, auto-converting to PDF using external API...')
                     try {
                         console.log(`📄 LaTeX content length: ${content.length} characters`)
                         
-                        // Compile LaTeX to PDF using node-pdflatex
-                        const pdfBuffer = await pdflatex(content)
-                        
-                        const pdfFileName = fileName.replace('.tex', '.pdf')
-                        const pdfFilePath = path.join(targetDir, pdfFileName)
-                        
-                        console.log(`💾 PDF size: ${pdfBuffer.byteLength} bytes`)
-                        console.log(`📁 Saving PDF to: ${pdfFilePath}`)
-                        
-                        await writeFile(pdfFilePath, pdfBuffer)
-                        console.log(`✅ PDF generated successfully: ${pdfFileName}`)
-                        
-                        return NextResponse.json({ 
-                            success: true, 
-                            pdfGenerated: true,
-                            pdfFileName: pdfFileName,
-                            message: `LaTeX file saved and converted to ${pdfFileName}`
+                        // Compile LaTeX to PDF using external API
+                        const compileResponse = await fetch('https://latexbase.com/api/v1/compile', {
+                            method: 'POST',
+                            headers: {
+                                'Content-Type': 'application/json',
+                            },
+                            body: JSON.stringify({
+                                compiler: 'pdflatex',
+                                content: content
+                            }),
+                            signal: AbortSignal.timeout(60000)
                         })
+
+                        if (compileResponse.ok) {
+                            const result = await compileResponse.json()
+                            
+                            if (result.status === 'success' && result.pdf) {
+                                const pdfBuffer = Buffer.from(result.pdf, 'base64')
+                                const pdfFileName = fileName.replace('.tex', '.pdf')
+                                const pdfFilePath = path.join(targetDir, pdfFileName)
+                                
+                                console.log(`💾 PDF size: ${pdfBuffer.byteLength} bytes`)
+                                console.log(`📁 Saving PDF to: ${pdfFilePath}`)
+                                
+                                await writeFile(pdfFilePath, pdfBuffer)
+                                console.log(`✅ PDF generated successfully: ${pdfFileName}`)
+                                
+                                return NextResponse.json({ 
+                                    success: true, 
+                                    pdfGenerated: true,
+                                    pdfFileName: pdfFileName,
+                                    message: `LaTeX file saved and converted to ${pdfFileName}`
+                                })
+                            } else {
+                                console.error('PDF compilation returned error:', result)
+                                return NextResponse.json({ 
+                                    success: true, 
+                                    pdfGenerated: false,
+                                    error: 'LaTeX file saved but PDF generation failed'
+                                })
+                            }
+                        } else {
+                            console.error('PDF compilation failed:', await compileResponse.text())
+                            return NextResponse.json({ 
+                                success: true, 
+                                pdfGenerated: false,
+                                error: 'LaTeX file saved but PDF generation failed'
+                            })
+                        }
                     } catch (pdfError) {
                         console.error('❌ Error generating PDF:', pdfError)
                         console.error('   Error details:', pdfError instanceof Error ? pdfError.message : String(pdfError))

app/api/latex/compile/route.ts

@@ -1,5 +1,4 @@
 import { NextRequest, NextResponse } from 'next/server'
-import pdflatex from 'node-pdflatex'
 
 export async function POST(request: NextRequest) {
   try {
@@ -12,37 +11,69 @@ export async function POST(request: NextRequest) {
       )
     }
 
-    console.log('📄 Compiling LaTeX to PDF using node-pdflatex...')
+    console.log('📄 Compiling LaTeX to PDF using external API...')
     console.log(`   Content length: ${latex.length} characters`)
 
-    // Compile LaTeX to PDF using node-pdflatex
-    const pdfBuffer = await pdflatex(latex)
+    // Try latexbase.com API (free, no auth required)
+    const compileResponse = await fetch('https://latexbase.com/api/v1/compile', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        compiler: 'pdflatex',
+        content: latex
+      }),
+      signal: AbortSignal.timeout(60000) // 60 second timeout for large documents
+    })
+
+    if (!compileResponse.ok) {
+      const errorText = await compileResponse.text()
+      console.error('❌ LaTeX compilation failed:', errorText)
+      return NextResponse.json(
+        { 
+          error: 'LaTeX compilation failed',
+          details: errorText.substring(0, 500),
+          message: 'The LaTeX compiler returned an error. Check your syntax.'
+        },
+        { status: 500 }
+      )
+    }
+
+    const result = await compileResponse.json()
     
-    console.log(`✅ LaTeX compiled successfully! PDF size: ${pdfBuffer.byteLength} bytes`)
+    if (result.status === 'success' && result.pdf) {
+      // The API returns base64-encoded PDF
+      const pdfBuffer = Buffer.from(result.pdf, 'base64')
+      console.log(`✅ LaTeX compiled successfully! PDF size: ${pdfBuffer.byteLength} bytes`)
 
-    // Return the PDF - convert Buffer to proper type for NextResponse
-    const response = new NextResponse(Buffer.from(pdfBuffer))
-    response.headers.set('Content-Type', 'application/pdf')
-    response.headers.set('Content-Disposition', `attachment; filename="${filename || 'document.pdf'}"`)
+      const response = new NextResponse(pdfBuffer)
+      response.headers.set('Content-Type', 'application/pdf')
+      response.headers.set('Content-Disposition', `attachment; filename="${filename || 'document.pdf'}"`)
 
-    return response
+      return response
+    } else {
+      console.error('❌ Compilation failed:', result)
+      return NextResponse.json(
+        { 
+          error: 'Failed to compile LaTeX',
+          details: result.error || result.log || 'Unknown error',
+          message: 'The LaTeX compiler encountered an error.'
+        },
+        { status: 500 }
+      )
+    }
 
   } catch (error) {
     console.error('❌ Error compiling LaTeX:', error)
     console.error('   Error type:', error instanceof Error ? error.constructor.name : typeof error)
     console.error('   Error message:', error instanceof Error ? error.message : String(error))
     
-    // Extract more detailed error info if available
-    let errorDetails = error instanceof Error ? error.message : String(error)
-    if (error && typeof error === 'object' && 'stderr' in error) {
-      errorDetails = (error as any).stderr || errorDetails
-    }
-    
     return NextResponse.json(
       { 
         error: 'Failed to compile LaTeX',
-        details: errorDetails,
-        message: 'There may be a syntax error in your LaTeX code. Check the console for details.'
+        details: error instanceof Error ? error.message : String(error),
+        message: 'Network error or compilation timeout. Please try again.'
       },
       { status: 500 }
     )

package-lock.json

@@ -21,13 +21,11 @@
         "highlight.js": "^11.11.1",
         "html-pdf-node": "^1.0.8",
         "latex": "^0.0.1",
-        "latex.js": "^0.12.6",
         "lucide-react": "^0.553.0",
         "mammoth": "^1.11.0",
         "monaco-editor": "^0.54.0",
         "next": "16.0.1",
         "node-fetch": "^3.3.2",
-        "node-pdflatex": "^0.3.0",
         "officegen": "^0.6.5",
         "pdf-parse": "^2.4.5",
         "pdfkit": "^0.17.2",
@@ -2505,12 +2503,6 @@
         "node": ">= 20"
       }
     },
-    "node_modules/@one-ini/wasm": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/@one-ini/wasm/-/wasm-0.1.1.tgz",
-      "integrity": "sha512-XuySG1E38YScSJoMlqovLru4KTUNSjgVTIjyh7qMX6aNN5HY5Ct5LhRJdxO79JtTzKfzV/bnWpz+zquYrISsvw==",
-      "license": "MIT"
-    },
     "node_modules/@phosphor-icons/react": {
       "version": "2.1.10",
       "resolved": "https://registry.npmjs.org/@phosphor-icons/react/-/react-2.1.10.tgz",
@@ -3933,15 +3925,6 @@
         "node": ">=10.0.0"
       }
     },
-    "node_modules/abbrev": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-2.0.0.tgz",
-      "integrity": "sha512-6/mh1E2u2YgEsCHdY0Yx5oW+61gZU+1vXaoiHHrpKeuRNNgFvS+/jrwHiQhB5apAf5oB7UB7E19ol2R2LKH8hQ==",
-      "license": "ISC",
-      "engines": {
-        "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
-      }
-    },
     "node_modules/accepts": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
@@ -5118,15 +5101,6 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
-    "node_modules/commander": {
-      "version": "8.3.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz",
-      "integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 12"
-      }
-    },
     "node_modules/compress-commons": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/compress-commons/-/compress-commons-4.1.2.tgz",
@@ -5162,16 +5136,6 @@
       "integrity": "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==",
       "license": "MIT"
     },
-    "node_modules/config-chain": {
-      "version": "1.1.13",
-      "resolved": "https://registry.npmjs.org/config-chain/-/config-chain-1.1.13.tgz",
-      "integrity": "sha512-qj+f8APARXHrM0hraqXYb2/bOVSV4PvJQlNZ/DVj0QrmNM2q2euizkeuVckQ57J+W0mRH6Hvi+k50M4Jul2VRQ==",
-      "license": "MIT",
-      "dependencies": {
-        "ini": "^1.3.4",
-        "proto-list": "~1.2.1"
-      }
-    },
     "node_modules/content-disposition": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.0.0.tgz",
@@ -5738,69 +5702,6 @@
         "safe-buffer": "^5.0.1"
       }
     },
-    "node_modules/editorconfig": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/editorconfig/-/editorconfig-1.0.4.tgz",
-      "integrity": "sha512-L9Qe08KWTlqYMVvMcTIvMAdl1cDUubzRNYL+WfA4bLDMHe4nemKkpmYzkznE1FwLKu0EEmy6obgQKzMJrg4x9Q==",
-      "license": "MIT",
-      "dependencies": {
-        "@one-ini/wasm": "0.1.1",
-        "commander": "^10.0.0",
-        "minimatch": "9.0.1",
-        "semver": "^7.5.3"
-      },
-      "bin": {
-        "editorconfig": "bin/editorconfig"
-      },
-      "engines": {
-        "node": ">=14"
-      }
-    },
-    "node_modules/editorconfig/node_modules/brace-expansion": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.2.tgz",
-      "integrity": "sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ==",
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0"
-      }
-    },
-    "node_modules/editorconfig/node_modules/commander": {
-      "version": "10.0.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-10.0.1.tgz",
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-      "license": "ISC",
-      "dependencies": {
-        "brace-expansion": "^2.0.1"
-      },
-      "engines": {
-        "node": ">=16 || 14 >=14.17"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
-    "node_modules/editorconfig/node_modules/semver": {
-      "version": "7.7.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
-      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
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     "node_modules/ee-first": {
       "version": "1.1.1",
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@@ -7956,28 +7857,6 @@
         "node": ">= 6"
       }
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-    "node_modules/hyphenation.de": {
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-      "dependencies": {
-        "hypher": "*"
-      }
-    },
-    "node_modules/hyphenation.en-us": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/hyphenation.en-us/-/hyphenation.en-us-0.2.1.tgz",
-      "integrity": "sha512-ItXYgvIpfN8rfXl/GTBQC7DsSb5PPsKh9gGzViK/iWzCS5mvjDebFJ6xCcIYo8dal+nSp2rUzvTT7BosrKlL8A==",
-      "dependencies": {
-        "hypher": "*"
-      }
-    },
-    "node_modules/hypher": {
-      "version": "0.2.5",
-      "resolved": "https://registry.npmjs.org/hypher/-/hypher-0.2.5.tgz",
-      "integrity": "sha512-kUTpuyzBWWDO2VakmjHC/cxesg4lKQP+Fdc+7lrK4yvjNjkV9vm5UTZMDAwOyyHTOpbkYrAMlNZHG61NnE9vYQ==",
-      "license": "BSD-3-Clause"
-    },
     "node_modules/iconv-lite": {
       "version": "0.6.3",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
@@ -8020,21 +7899,6 @@
         "node": ">= 4"
       }
     },
-    "node_modules/image-size": {
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-      "resolved": "https://registry.npmjs.org/image-size/-/image-size-1.2.1.tgz",
-      "integrity": "sha512-rH+46sQJ2dlwfjfhCyNx5thzrv+dtmBIhPHk0zgRUukHzZ/kRueTJXoYYsclBaKcSMBWuGbOFXtioLpzTb5euw==",
-      "license": "MIT",
-      "dependencies": {
-        "queue": "6.0.2"
-      },
-      "bin": {
-        "image-size": "bin/image-size.js"
-      },
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-      }
-    },
     "node_modules/immediate": {
       "version": "3.0.6",
       "resolved": "https://registry.npmjs.org/immediate/-/immediate-3.0.6.tgz",
@@ -8085,12 +7949,6 @@
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       "license": "ISC"
     },
-    "node_modules/ini": {
-      "version": "1.3.8",
-      "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.8.tgz",
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-      "license": "ISC"
-    },
     "node_modules/inline-css": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/inline-css/-/inline-css-3.0.0.tgz",
@@ -8696,70 +8554,6 @@
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       "license": "MIT"
     },
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-      "version": "1.14.11",
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-      "dependencies": {
-        "config-chain": "^1.1.13",
-        "editorconfig": "^1.0.3",
-        "glob": "^10.3.3",
-        "nopt": "^7.2.0"
-      },
-      "bin": {
-        "css-beautify": "js/bin/css-beautify.js",
-        "html-beautify": "js/bin/html-beautify.js",
-        "js-beautify": "js/bin/js-beautify.js"
-      },
-      "engines": {
-        "node": ">=14"
-      }
-    },
-    "node_modules/js-beautify/node_modules/brace-expansion": {
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-        "path-scurry": "^1.11.1"
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@@ -8930,53 +8724,6 @@
         "through": "~2.1.0"
       }
     },
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-      "dependencies": {
-        "commander": "8.x",
-        "fs-extra": "10.x",
-        "hyphenation.de": "*",
-        "hyphenation.en-us": "*",
-        "js-beautify": "1.14.x",
-        "stdin": "*",
-        "svgdom": "^0.1.8"
-      },
-      "bin": {
-        "latex.js": "bin/latex.js"
-      },
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-        "node": ">= 14.0"
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package.json

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