GitHub - nnnkkk7/go-simdcsv: High-performance SIMD-accelerated CSV parser for Go 1.26+ using simd/archsimd. Drop-in replacement for encoding/csv

import csv "github.com/nnnkkk7/go-simdcsv"

reader := csv.NewReader(strings.NewReader("name,age\nAlice,30\nBob,25"))
records, err := reader.ReadAll()
if err != nil {
    log.Fatal(err)
}
// records: [[name age] [Alice 30] [Bob 25]]

go get github.com/nnnkkk7/go-simdcsv

// All at once
records, err := csv.NewReader(r).ReadAll()

// Record by record
reader := csv.NewReader(r)
for {
    record, err := reader.Read()
    if err == io.EOF { break }
    if err != nil { return err }
    // process record
}

// Direct byte parsing (fastest)
records, err := csv.ParseBytes(data, ',')

// Streaming callback
csv.ParseBytesStreaming(data, ',', func(record []string) error {
    return processRecord(record)
})

writer := csv.NewWriter(w)
writer.WriteAll(records)

reader := csv.NewReader(r)
reader.Comma = ';'              // Field delimiter (default: ',')
reader.Comment = '#'            // Comment character
reader.LazyQuotes = true        // Allow bare quotes
reader.TrimLeadingSpace = true  // Trim leading whitespace
reader.ReuseRecord = true       // Reuse slice for performance
reader.FieldsPerRecord = 3      // Expected fields (0 = auto-detect, -1 = variable)

reader := csv.NewReaderWithOptions(r, csv.ReaderOptions{
    SkipBOM: true,  // Skip UTF-8 BOM if present
})

┌─────────────┐     ┌──────────────┐     ┌──────────────┐     ┌──────────────┐
│  Raw Input  │ ──▶ │ scanBuffer() │ ──▶ │ parseBuffer()│ ──▶ │buildRecords()│ ──▶ [][]string
│   []byte    │     │  (bitmasks)  │     │  (positions) │     │  (strings)   │
└─────────────┘     └──────────────┘     └──────────────┘     └──────────────┘

# Build
GOEXPERIMENT=simd go build ./...

# Test
GOEXPERIMENT=simd go test -v ./...

# Benchmark
GOEXPERIMENT=simd go test -bench=. -benchmem