v2.9.0

What's Changed

• Fix C implementation of script_safe escaping to not confuse some other 3 wide characters with \u2028 and \u2029.
  e.g. JSON.generate(["倩", "瀨"], script_safe: true) would generate the wrong JSON.
• JSON.dump(object, some_io) now write into the IO in chunks while previously it would buffer the entire JSON before writing.
• JSON::GeneratorError now has a #invalid_object attribute, making it easier to understand why an object tree cannot be serialized.
• Numerous improvements to the JRuby extension.

Full Changelog: v2.8.2...v2.9.0

v2.8.2

What's Changed

• JSON.load_file: explictly load the file as UTF-8

Full Changelog: v2.8.1...v2.8.2

v2.8.1

• Fix the java version of the package to include the extension implementation. Only concerns JRuby.

Full Changelog: v2.8.0...v2.8.1

v2.8.0

What's Changed

• Emit a deprecation warning when JSON.load create custom types without the create_additions option being explictly enabled.
  • Prefer to use JSON.unsafe_load(string) or JSON.load(string, create_additions: true).
• Emit a deprecation warning when serializing valid UTF-8 strings encoded in ASCII_8BIT aka BINARY.
• Bump required Ruby version to 2.7.
• Add support for optionally parsing trailing commas, via allow_trailing_comma: true, which in cunjunction with the
  pre-existing support for comments, make it suitable to parse jsonc documents.
• Many performance improvements to JSON.parse and JSON.load, up to 1.7x faster on real world documents.
• Some minor performance improvements to JSON.dump and JSON.generate.
• JSON.pretty_generate no longer include newline inside empty object and arrays.

Parsing performance

Parsing performance is improved by 50-70% on realistic benchmarks, and even more on micro-benchmarks: https://gist.github.com/casperisfine/cf4b3a0594fae24b7d0eb93daaf3841a

== Parsing activitypub.json (58160 bytes)
ruby 3.4.0dev (2024-11-06T07:59:09Z precompute-hash-wh.. 7943f98a8a) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
          json 2.7.2   638.000 i/100ms
                  oj   798.000 i/100ms
          Oj::Parser   948.000 i/100ms
           rapidjson   631.000 i/100ms
Calculating -------------------------------------
          json 2.7.2      6.423k (± 1.3%) i/s  (155.70 μs/i) -     32.538k in   5.067149s
                  oj      7.989k (± 1.0%) i/s  (125.17 μs/i) -     40.698k in   5.094544s
          Oj::Parser      9.472k (± 1.3%) i/s  (105.58 μs/i) -     47.400k in   5.005119s
           rapidjson      6.354k (± 1.1%) i/s  (157.37 μs/i) -     32.181k in   5.064962s

Comparison:
          json 2.8.0:     9510.0 i/s
          Oj::Parser:     9471.9 i/s - same-ish: difference falls within error
                  oj:     7989.4 i/s - 1.19x  slower
          json 2.7.2:     6422.5 i/s - 1.48x  slower
           rapidjson:     6354.5 i/s - 1.50x  slower


== Parsing twitter.json (567916 bytes)
ruby 3.4.0dev (2024-11-06T07:59:09Z precompute-hash-wh.. 7943f98a8a) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
          json 2.7.2    52.000 i/100ms
                  oj    64.000 i/100ms
          Oj::Parser    76.000 i/100ms
           rapidjson    57.000 i/100ms
Calculating -------------------------------------
          json 2.7.2    526.860 (± 3.8%) i/s    (1.90 ms/i) -      2.652k in   5.042680s
                  oj    631.234 (± 1.7%) i/s    (1.58 ms/i) -      3.200k in   5.070973s
          Oj::Parser    764.354 (± 3.5%) i/s    (1.31 ms/i) -      3.876k in   5.077736s
           rapidjson    579.085 (± 2.8%) i/s    (1.73 ms/i) -      2.907k in   5.024620s

Comparison:
          json 2.8.0:      884.0 i/s
          Oj::Parser:      764.4 i/s - 1.16x  slower
                  oj:      631.2 i/s - 1.40x  slower
           rapidjson:      579.1 i/s - 1.53x  slower
          json 2.7.2:      526.9 i/s - 1.68x  slower


== Parsing citm_catalog.json (1727030 bytes)
ruby 3.4.0dev (2024-11-06T07:59:09Z precompute-hash-wh.. 7943f98a8a) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
          json 2.7.2    30.000 i/100ms
                  oj    35.000 i/100ms
          Oj::Parser    45.000 i/100ms
           rapidjson    40.000 i/100ms
Calculating -------------------------------------
          json 2.7.2    304.584 (± 3.3%) i/s    (3.28 ms/i) -      1.530k in   5.029021s
                  oj    358.572 (± 0.8%) i/s    (2.79 ms/i) -      1.820k in   5.076123s
          Oj::Parser    450.643 (± 3.1%) i/s    (2.22 ms/i) -      2.295k in   5.098150s
           rapidjson    395.304 (± 1.5%) i/s    (2.53 ms/i) -      2.000k in   5.060537s

Comparison:
          json 2.8.0:      449.8 i/s
          Oj::Parser:      450.6 i/s - same-ish: difference falls within error
           rapidjson:      395.3 i/s - 1.14x  slower
                  oj:      358.6 i/s - 1.25x  slower
          json 2.7.2:      304.6 i/s - 1.48x  slower

Full Changelog: v2.7.3...v2.8.0

v2.7.6

• Fix a regression in JSON.generate when dealing with Hash keys that are string subclasses, call to_json on them.

Full Changelog: v2.7.5...v2.7.6

v2.7.5

What's Changed

• Fix a memory leak when #to_json methods raise an exception.
• Gracefully handle formatting configs being set to nil instead of "".
• Workaround another issue caused by conflicting versions of both json_pure and json being loaded.

Full Changelog: v2.7.4...v2.7.5

v2.7.4

What's Changed

• Workaround a bug in 3.4.8 and older rubygems/rubygems#6490.
  This bug would cause some gems with native extension to fail during compilation.
• Workaround different versions of json and json_pure being loaded (not officially supported).
• Make json_pure Ractor compatible.

Full Changelog: v2.7.3...v2.7.4

v2.7.3

What's Changed

• Numerous performance optimizations in JSON.generate and JSON.dump (up to 2 times faster).
• Limit the size of ParserError exception messages, only include up to 32 bytes of the unparseable source.
• Fix json-pure's Object#to_json to accept non state arguments
• Fix multiline comment support in json-pure.
• Fix JSON.parse to no longer mutate the argument encoding when passed an ASCII-8BIT string.
• Fix String#to_json to raise on invalid encoding in json-pure.
• Delete code that was based on CVTUTF.
• Use the pure-Ruby generator on TruffleRuby.
• Fix strict mode in json-pure to not break on Integer.

JSON.dump Performance

JSON.dump is now much faster, and on par or faster than alternative implementations:

== Encoding citm_catalog.json (500298 bytes)
ruby 3.4.0preview2 (2024-10-07 master 32c733f57b) +YJIT +PRISM [arm64-darwin23]
Warming up --------------------------------------
        json (2.7.3)   123.000 i/100ms
                  oj   124.000 i/100ms
Calculating -------------------------------------
        json (2.7.3)      1.312k (± 1.8%) i/s  (761.91 μs/i) -      6.642k in   5.062192s
                  oj      1.278k (± 2.0%) i/s  (782.35 μs/i) -      6.448k in   5.046587s

Comparison:
        json (2.7.2):      884.0 i/s
        json (2.7.3):     1312.5 i/s - 1.48x  faster
                  oj:     1278.2 i/s - 1.45x  faster

== Encoding twitter.json (466906 bytes)
ruby 3.4.0preview2 (2024-10-07 master 32c733f57b) +YJIT +PRISM [arm64-darwin23]
Warming up --------------------------------------
        json (2.7.3)   213.000 i/100ms
                  oj   222.000 i/100ms
Calculating -------------------------------------
        json (2.7.3)      2.140k (± 2.8%) i/s  (467.19 μs/i) -     10.863k in   5.079099s
                  oj      2.303k (± 3.2%) i/s  (434.27 μs/i) -     11.544k in   5.018239s

Comparison:
        json (2.7.2):     1250.5 i/s
                  oj:     2302.7 i/s - 1.84x  faster
        json (2.7.3):     2140.5 i/s - 1.71x  faster

Full Changelog: v2.7.2...v2.7.3

v2.7.3.rc1

• Numerous performance optimizations in JSON.generate and JSON.dump.
• Limit the size of ParserError exception messages, only include up to 32 bytes of the unparseable source.
• Fix json-pure's Object#to_json to accept non state arguments
• Fix multiline comment support in json-pure.
• Fix JSON.parse to no longer mutate the argument encoding when passed an ASCII-8BIT string.
• Fix String#to_json to raise on invalid encoding in json-pure.
• Delete code that was based on CVTUTF.
• Use the pure-Ruby generator on TruffleRuby.
• Fix strict mode in json-pure to not break on Integer.

v2.7.2

What's Changed

• Use rb_sym2str instead of SYM2ID by @jhawthorn in #561
• Fix memory leak when exception is raised during JSON generation by @peterzhu2118 in #574
• Remove references to "19" methods in JRuby by @headius in #576
• Make OpenStruct support as optional by @hsbt in #565
• Autoload JSON::GenericObject to avoid require ostruct warning in Ruby 3.4 by @tompng in #577
• Warn to install ostruct if json couldn't load it by @hsbt in #578

New Contributors

• @mperham made their first contribution in #571
• @peterzhu2118 made their first contribution in #574

Full Changelog: v2.7.1...v2.7.2