Fastest JSON reader writer for C

Question

I need a C   JSON parser  amp  writer  Speed and reliability are very critical  I don t care if the interface is nice or not  if it s Boost-based or not  even a C parser is fine  if it s considerably faster than C   ones    If somebody has experience with the speed of available JSON parsers  please advise

User · Accepted Answer

http   lloyd github com yajl    http   www digip org jansson   Don t really know how they compare for speed  but the first one looks like the right idea for scaling to really big JSON data  since it parses only a small chunk at a time so they don t need to hold all the data in memory at once  This can be faster or slower depending on the library use case

User · Answer

rapidjson is a C   JSON parser generator designed to be fast and small memory footprint   There is a performance comparison with YAJL and JsonCPP     Update   I created an open source project Native JSON benchmark  which evaluates 29  and increasing  C C   JSON libraries  in terms of conformance and performance  This should be an useful reference

User · Answer

https   github com quartzjer js0n  Ugliest interface possible  but does what you ask  Zero allocations   http   zserge com jsmn html Another zero-allocation approach   The solutions posted above all do dynamic memory allocation  hence will be inevitably end up slower at some point  depending on the data structure - and will be dangerous to include in a heap constrained environment like an embedded system   Benchmarks of vjson  rapidjson and sajson here   http   chadaustin me 2013 01 json-parser-benchmarking  if you are interested in that sort of thing   And to answer your  writer  part of the question i doubt that you could beat an efficient   printf    s  s   name value    implementation with any library - assuming your printf sprintf implementation itself is lightweight of course   EDIT  actually let me take that back  RapidJson allows on-stack allocation only through its MemoryPoolAllocator and actually makes this a default for its GenericReader  I havent done the comparison but i  would expect it to be more robust than anything else listed here  It also doesnt have any dependencies  and it doesnt throw exceptions which probably makes it ultimately suitable for embedded  Fully header based lib so  easy to include anywhere

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