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yyjson

Parse, create, and modify JSON documents in C using the yyjson library.

1.0k|108|Updated Nov 20, 2020
Search Tags:#parsing#serialization#Json#C#allocator#yyjson#json pointer
One-click install
npx skills add https://github.com/LuisaGroup/LuisaCompute --skill yyjson
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: yyjson
Source: https://github.com/LuisaGroup/LuisaCompute/tree/main/.agents/skills/yyjson
Command: npx skills add https://github.com/LuisaGroup/LuisaCompute --skill yyjson

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Working with JSON in C requires careful handling of parsing, memory management, and serialization. This Skill provides a complete reference for using yyjson, the single-header ANSI C JSON library bundled in LuisaCompute, covering both immutable and mutable document models.

Core Features & Use Cases

  • JSON Reading and Access: Parse JSON from strings, files, or streams with configurable read flags, then query values via type checks, getters, and iterators.
  • JSON Creation and Modification: Build and edit documents with the mutable API, including array/object manipulation, JSON Pointer operations, and RFC 6902/7386 patching.
  • Serialization and Memory Control: Write minified or pretty-printed JSON with custom allocators, including LuisaCompute's allocator integration pattern.
  • Use Case: Read a configuration file with yyjson_read_file, convert it to a mutable document, remove null entries with an iterator, and write the result back with pretty formatting.

Quick Start

Show me how to read a JSON file with yyjson, modify a value, and write it back with pretty printing.

Frequently Asked Questions about yyjson

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I parse JSON in C with yyjson?▼

Call yyjson_read with your buffer and length, or yyjson_read_file for file input, to get an immutable yyjson_doc. Access the root with yyjson_doc_get_root, then use type checks and getters like yyjson_get_str or yyjson_obj_get to read values.

How do I modify a JSON document with yyjson?▼

Convert the immutable document with yyjson_doc_mut_copy, then use mutable APIs like yyjson_mut_obj_add, yyjson_mut_arr_append, or yyjson_mut_doc_ptr_set. Note that a mutable value can only belong to one container at a time.

Does yyjson support custom memory allocators?▼

Yes, yyjson accepts a custom yyjson_alc with malloc, realloc, and free signatures passed to read and write functions. LuisaCompute forwards allocations to luisa::detail allocator functions with 16-byte alignment.

Why is yyjson object key lookup slow?▼

yyjson stores arrays and objects as linked lists, so index and key lookups are O(n). For repeated access, prefer iterators like yyjson_arr_iter or yyjson_obj_iter, or the yyjson_arr_foreach and yyjson_obj_foreach macros.

Does yyjson support JSON Pointer and JSON Patch?▼

Yes, yyjson implements RFC 6901 JSON Pointer via yyjson_doc_ptr_get and mutable set/add/remove variants, plus RFC 6902 JSON Patch via yyjson_patch and RFC 7386 Merge Patch via yyjson_merge_patch.

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