C JSON parser

• lightning-fast implementation of a JSON parser
• added JSON validation
• easy to read, learn and implement
• c17 ready / c89 compatible

performance

• significantly faster compared to json-c
• a little bit faster than simdjson
• supports RFC 8259
• supports SSE2

data

• 2.8 nanoseconds (per run)
• 3846 bytes in a test data

badges

Speed comparison

Metric	simdjson	c-json-parser(*)	c-json-parser(**)	c-json-parser	json-c
execution time (100K run)	00:00:00.393	00:00:00.244	00:00:00.281	00:00:01.182	00:00:04.093
execution time (1M runs)	00:00:03.959	00:00:02.446	00:00:02.804	00:00:11.838	00:00:42.702
allocation calls (100K runs)	-	0	0	20,000,000	52,900,000
allocation calls (1M runs)	-	0	0	200,000,000	529,000,000
total heap usage (100K runs)	-	0	0	806,400,000	4,179,600,000
total heap usage (1M runs)	-	0	0	8,064,000,000	41,796,000,000

(*) - 0-alloc version without string escape symbols validation (**) - 0-alloc version with string escape symbols validation

docs

• basics

screenshots

tools

Ninja + Clang

prerequisites

sudo apt install -y git cmake clang clang gcc g++ lld

build

./build-c-json-parser.sh

profiling

./gprof.sh

test

./test.sh

runtime / performance

./perf.sh
./perf.sh perf-c-json-parser
./perf.sh perf-c-json-parser-long
./perf.sh perf-c-json-parser-no-string-validation
./perf.sh perf-c-json-parser-no-string-validation-long

installation simdjson / json-c

./bin/install_json_c.sh
./bin/install_simdjson.sh

build simdjson / json-c

./build-json-c.sh
./build-simdjson.sh