High level CSV library for Go 1.18+

This is a library for decoding and encoding CSV at high level as it provides convenient methods and many configuration options to process the data the way you expect.

This library is inspired by the project https://github.com/jszwec/csvutil.

Functionalities

Decoding

• Decode CSV data into Go struct
• Support Go interface encoding.TextUnmarshaler (with function UnmarshalText)
• Support custom interface CSVUnmarshaler (with function UnmarshalCSV)
• Ability to continue decoding when error occurs (collect all errors at once)
• Ability to perform custom preprocessor functions on cell data before decoding
• Ability to perform custom validator functions on cell data after decoding
• Ability to decode dynamic columns into Go struct field (inline columns)
• Support rendering the result errors into human-readable content (row-by-row text and CSV)
• Support localization to render the result errors into a specific language

Encoding

• Encode Go struct into CSV data
• Support Go interface encoding.TextMarshaler (with function MarshalText)
• Support custom interface CSVMarshaler (with function MarshalCSV)
• Ability to perform custom postprocessor functions on cell data after encoding
• Ability to encode dynamic columns defined via inner Go struct (inline columns)
• Ability to localize the header into a specific language

Installation

go get github.com/tiendc/go-csvlib

Usage

• Decoding
• Encoding

Benchmarks

csvlib vs csvutil vs gocsv vs easycsv

Benchmark code

Unmarshal

BenchmarkUnmarshal/csvlib.Unmarshal/100_records
BenchmarkUnmarshal/csvlib.Unmarshal/100_records-10       	   21572	     55520 ns/op
BenchmarkUnmarshal/csvlib.Unmarshal/1000_records
BenchmarkUnmarshal/csvlib.Unmarshal/1000_records-10      	    2641	    455794 ns/op
BenchmarkUnmarshal/csvlib.Unmarshal/10000_records
BenchmarkUnmarshal/csvlib.Unmarshal/10000_records-10     	     253	   4716323 ns/op
BenchmarkUnmarshal/csvlib.Unmarshal/100000_records
BenchmarkUnmarshal/csvlib.Unmarshal/100000_records-10    	      26	  44519502 ns/op

BenchmarkUnmarshal/csvutil.Unmarshal/100_records
BenchmarkUnmarshal/csvutil.Unmarshal/100_records-10      	   27848	     42927 ns/op
BenchmarkUnmarshal/csvutil.Unmarshal/1000_records
BenchmarkUnmarshal/csvutil.Unmarshal/1000_records-10     	    2952	    405309 ns/op
BenchmarkUnmarshal/csvutil.Unmarshal/10000_records
BenchmarkUnmarshal/csvutil.Unmarshal/10000_records-10    	     296	   4059881 ns/op
BenchmarkUnmarshal/csvutil.Unmarshal/100000_records
BenchmarkUnmarshal/csvutil.Unmarshal/100000_records-10   	      28	  40531973 ns/op

BenchmarkUnmarshal/gocsv.Unmarshal/100_records
BenchmarkUnmarshal/gocsv.Unmarshal/100_records-10        	    9830	    118919 ns/op
BenchmarkUnmarshal/gocsv.Unmarshal/1000_records
BenchmarkUnmarshal/gocsv.Unmarshal/1000_records-10       	    1022	   1164278 ns/op
BenchmarkUnmarshal/gocsv.Unmarshal/10000_records
BenchmarkUnmarshal/gocsv.Unmarshal/10000_records-10      	      86	  12609154 ns/op
BenchmarkUnmarshal/gocsv.Unmarshal/100000_records
BenchmarkUnmarshal/gocsv.Unmarshal/100000_records-10     	       9	 119912333 ns/op

BenchmarkUnmarshal/easycsv.ReadAll/100_records
BenchmarkUnmarshal/easycsv.ReadAll/100_records-10        	    3831	    315302 ns/op
BenchmarkUnmarshal/easycsv.ReadAll/1000_records
BenchmarkUnmarshal/easycsv.ReadAll/1000_records-10       	     384	   3083931 ns/op
BenchmarkUnmarshal/easycsv.ReadAll/10000_records
BenchmarkUnmarshal/easycsv.ReadAll/10000_records-10      	      34	  31440493 ns/op
BenchmarkUnmarshal/easycsv.ReadAll/100000_records
BenchmarkUnmarshal/easycsv.ReadAll/100000_records-10     	       4	 324321531 ns/op

Marshal

BenchmarkMarshal/csvlib.Marshal/100_records
BenchmarkMarshal/csvlib.Marshal/100_records-10         	   19753	     58890 ns/op
BenchmarkMarshal/csvlib.Marshal/1000_records
BenchmarkMarshal/csvlib.Marshal/1000_records-10        	    2149	    554537 ns/op
BenchmarkMarshal/csvlib.Marshal/10000_records
BenchmarkMarshal/csvlib.Marshal/10000_records-10       	     214	   5575920 ns/op
BenchmarkMarshal/csvlib.Marshal/100000_records
BenchmarkMarshal/csvlib.Marshal/100000_records-10      	      19	  55735281 ns/op

BenchmarkMarshal/csvutil.Marshal/100_records
BenchmarkMarshal/csvutil.Marshal/100_records-10        	   24388	     48931 ns/op
BenchmarkMarshal/csvutil.Marshal/1000_records
BenchmarkMarshal/csvutil.Marshal/1000_records-10       	    2557	    467704 ns/op
BenchmarkMarshal/csvutil.Marshal/10000_records
BenchmarkMarshal/csvutil.Marshal/10000_records-10      	     256	   4720885 ns/op
BenchmarkMarshal/csvutil.Marshal/100000_records
BenchmarkMarshal/csvutil.Marshal/100000_records-10     	      22	  48627754 ns/op

BenchmarkMarshal/gocsv.Marshal/100_records
BenchmarkMarshal/gocsv.Marshal/100_records-10          	   13254	     90873 ns/op
BenchmarkMarshal/gocsv.Marshal/1000_records
BenchmarkMarshal/gocsv.Marshal/1000_records-10         	    1294	    898938 ns/op
BenchmarkMarshal/gocsv.Marshal/10000_records
BenchmarkMarshal/gocsv.Marshal/10000_records-10        	     132	   9017481 ns/op
BenchmarkMarshal/gocsv.Marshal/100000_records
BenchmarkMarshal/gocsv.Marshal/100000_records-10       	      12	  90260420 ns/op

Contributing

• You are welcome to make pull requests for new functions and bug fixes.

Authors

• Dao Cong Tien (tiendc)

License

• MIT License