Convert HTML to PDF in Go

Quick Start

package main

import (
    "bytes"
    "encoding/json"
    "io"
    "log"
    "net/http"
    "os"
)

func main() {
    payload := map[string]interface{}{
        "html":   "<h1>Hello World</h1>",
        "format": "pdf",
    }

    jsonData, err := json.Marshal(payload)
    if err != nil {
        log.Fatal(err)
    }

    req, err := http.NewRequest("POST", "https://html2pdfapi.com/render", bytes.NewBuffer(jsonData))
    if err != nil {
        log.Fatal(err)
    }
    req.Header.Set("Authorization", "Bearer YOUR_API_KEY")
    req.Header.Set("Content-Type", "application/json")

    resp, err := http.DefaultClient.Do(req)
    if err != nil {
        log.Fatal(err)
    }
    defer resp.Body.Close()

    out, err := os.Create("output.pdf")
    if err != nil {
        log.Fatal(err)
    }
    defer out.Close()
    io.Copy(out, resp.Body)
}

Gin Framework Example

package main

import (
    "bytes"
    "encoding/json"
    "io"
    "net/http"
    "os"

    "github.com/gin-gonic/gin"
)

func generatePDF(c *gin.Context) {
    htmlContent := renderTemplate("invoice.html", invoiceData)

    payload := map[string]interface{}{
        "html":   htmlContent,
        "format": "pdf",
        "options": map[string]interface{}{
            "format": "A4",
        },
    }

    jsonData, err := json.Marshal(payload)
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    req, err := http.NewRequest("POST", "https://html2pdfapi.com/render", bytes.NewBuffer(jsonData))
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }
    req.Header.Set("Authorization", "Bearer "+os.Getenv("HTML2PDFAPI_KEY"))
    req.Header.Set("Content-Type", "application/json")

    resp, err := http.DefaultClient.Do(req)
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }
    defer resp.Body.Close()

    pdfData, err := io.ReadAll(resp.Body)
    if err != nil {
        c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }

    c.Header("Content-Disposition", "attachment; filename=invoice.pdf")
    c.Data(http.StatusOK, "application/pdf", pdfData)
}

Available Options