What JSON library do you suggest?

• RapidJSON

  15 13,852 6.1 C++

  A fast JSON parser/generator for C++ with both SAX/DOM style API

  

Thank you for your response. In reply to the first issue you raise, note that Tencent gives the following guidance: "Generally speaking, RapidJSON should be exception-safe (enough) to replace RAPIDJSON_ASSERT by an exception." If some of those functions are now noexcept, that would be... unfortunate. Especially if this is the kind of noexcept that gets randomly slapped on functions nowadays "because we can", rather than "because we must".

• json

  93 40,239 7.7 C++

  JSON for Modern C++

https://github.com/nlohmann/json for ease of use; I'd suggest this as your general go to, and switch libraries if extreme performance is needed, and reading large amounts of JSON is part of the bottleneck. In which case https://github.com/simdjson/simdjson

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• simdjson

  65 18,362 9.2 C++

  Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

  

https://github.com/nlohmann/json for ease of use; I'd suggest this as your general go to, and switch libraries if extreme performance is needed, and reading large amounts of JSON is part of the bottleneck. In which case https://github.com/simdjson/simdjson

• daw_json_link

  21 424 8.6 C++

  Fast, convenient JSON serialization and parsing in C++

I am biased, so will suggest DAW JSON Link https://github.com/beached/daw_json_link. Fast and allows for a declarative mapping of JSON to your data structures. This allows it to optimize based on what you will be parsing and get past the intermediary DOM types. A nice benefit there is that the limits on the parser are the limits of your type(you can parse to a bigint or a rational type if needed)

• JsonCpp

  6 7,858 1.9 C++

  A C++ library for interacting with JSON.

  

I like https://github.com/open-source-parsers/jsoncpp

• json_struct

  6 371 8.0 C++

  json_struct is a single header only C++ library for parsing JSON directly to C++ structs and vice versa

json_struct for serializing directly to and from structs. Its one header only and performs on par with RapidJSON.

• univalue

  5 29 0.0 C++

  An easy-to-use and competitively fast JSON parsing library for C++17, forked from Bitcoin Cash Node's own UniValue library.

• WorkOS

  workos.com sponsored

  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

• json_dto

  2 121 8.1 C++

  A small header-only library for converting data between json representation and c++ structs

  

json_dto on top of RapidJSON.

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