https://github.com/default-writer/c-json-parser
Simple json parser
https://github.com/default-writer/c-json-parser
Last synced: 6 months ago
JSON representation
Simple json parser
- Host: GitHub
- URL: https://github.com/default-writer/c-json-parser
- Owner: default-writer
- License: bsd-3-clause
- Created: 2025-10-22T22:43:22.000Z (9 months ago)
- Default Branch: main
- Last Pushed: 2025-12-26T00:09:58.000Z (7 months ago)
- Last Synced: 2025-12-26T16:57:29.517Z (7 months ago)
- Language: C
- Size: 3.75 MB
- Stars: 23
- Watchers: 1
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Security: SECURITY.md
Awesome Lists containing this project
README
# [C JSON parser](https://github.com/default-writer/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](https://github.com/json-c/json-c)
- a little bit faster than [simdjson](https://github.com/simdjson/simdjson)
- supports [RFC 8259](https://datatracker.ietf.org/doc/html/rfc8259)
- supports SSE2
## [data](data/test.json)
- 2.8 nanoseconds (per run)
- 3846 bytes in a test data
## badges
[](https://github.com/default-writer/c-json-parser/actions/workflows/codeql.yml)
## 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 | 00:00:00.275 | 00:00:01.182 | 00:00:04.093 |
| execution time (1M runs) | 00:00:03.959 | 00:00:02.446 | 00:00:02.751 | 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](docs/data-structures.md)
## screenshots
## tools
Ninja + Clang
## prerequisites
```bash
sudo apt install -y git cmake clang clang gcc g++ lld
```
## build
```bash
./build-c-json-parser.sh
```
## profiling
```bash
./gprof.sh
```
## test
```bash
./test.sh
```
## runtime / performance
```bash
./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](https://github.com/simdjson/simdjson) / [json-c](https://github.com/json-c/json-c)
```bash
./bin/install_json_c.sh
./bin/install_simdjson.sh
```
## build [simdjson](https://github.com/simdjson/simdjson) / [json-c](https://github.com/json-c/json-c)
```bash
./build-json-c.sh
./build-simdjson.sh
```