C JSON parser

• lightning-fast implementation of a JSON parser
• c89 compatible
• easy to read, learn and implement
• performance improvement rate of x4/x4 for speed/memory compared to json-c
• just a little bit slower (x0.5) than simdjson

badges

Speed comparison

Metric	simdjson	c-json-parser(*)	c-json-parser	json-c
execution time (100K run)	00:00:00.395	00:00:00.881	00:00:01.182	00:00:04.093
execution time (1M runs)	-	00:00:08.808	00:00:11.838	00:00:42.702
allocation calls (100K runs)	-	0	20,000,000	52,900,000
allocation calls (1M runs)	-	0	200,000,000	529,000,000
total heap usage (100K runs)	-	0	806,400,000	4,179,600,000
total heap usage (1M runs)	-	0	8,064,000,000	41,796,000,000

(*) - alloc-free version (fixed buffer size)

docs

• data structures
• documentation

screenshots

tools

Ninja + Clang

prerequisites

Debian/Linux

sudo apt install -y clang lld

json-c

mkdir build
cd build
git clone https://github.com/json-c/json-c.git
cd json-c
cmake -DCMAKE_INSTALL_PREFIX=../../libs/ -DCMAKE_BUILD_TYPE=release
make all install

or just run (linux-based)

./bin/install_json_c.sh

building

./build.sh

./build-json-c.sh

or

ninja -f build.linux.ninja && ./test-main

testing

ninja -f build.linux.ninja -t clean > /dev/null 2>&1 && ninja -f build.linux.ninja && ninja -f build.linux.ninja -t clean > /dev/null 2>&1

profiling / performance tests (json-c)

ninja -f build.linux.ninja -t clean > /dev/null 2>&1 && ninja -f build.linux.ninja perf && ninja -f build.linux.ninja -t clean > /dev/null 2>&1
ninja -f build.linux.ninja -t clean > /dev/null 2>&1 && ninja -f build.linux.ninja perf-json-c && ninja -f build.linux.ninja -t clean > /dev/null 2>&1

python

python3 test/perf_test.py