Parser Comparisons

JSON Test Suite

JSON Checker

JSON Test Suite

jsoncons-0.179.0
nlohmann-3.11.2
rapidjson-2020-02-08
jsoncpp-1.9.5
taojson-2020-09-14
Expected result283 188 188 246 188
Expected success, parsing failed0 95 95 0 95
Expected failure, parsing succeeded0 0 0 37 0
Result undefined, parsing succeeded17 0 0 25 0
Result undefined, parsing failed18 35 35 10 35
Process stopped0 0 0 0 0
jsoncons
nlohmann
rapidjson
jsoncpp
taojson
y_array_arraysWithSpaces.json [[] ]
y_array_empty-string.json [""]
y_array_empty.json []
y_array_ending_with_newline.json ["a"]
y_array_false.json [false]
y_array_heterogeneous.json [null, 1, "1", {}]
y_array_null.json [null]
y_array_with_1_and_newline.json [1 ]
y_array_with_leading_space.json [1]
y_array_with_several_null.json [1,null,null,null,2]
y_array_with_trailing_space.json [2]
y_number.json [123e65]
y_number_0e+1.json [0e+1]
y_number_0e1.json [0e1]
y_number_after_space.json [ 4]
y_number_double_close_to_zero.json [-0.00000000000000000000000000 ...
y_number_int_with_exp.json [20e1]
y_number_minus_zero.json [-0]
y_number_negative_int.json [-123]
y_number_negative_one.json [-1]
y_number_negative_zero.json [-0]
y_number_real_capital_e.json [1E22]
y_number_real_capital_e_neg_exp.json [1E-2]
y_number_real_capital_e_pos_exp.json [1E+2]
y_number_real_exponent.json [123e45]
y_number_real_fraction_exponent.json [123.456e78]
y_number_real_neg_exp.json [1e-2]
y_number_real_pos_exponent.json [1e+2]
y_number_simple_int.json [123]
y_number_simple_real.json [123.456789]
y_object.json {"asd":"sdf", "dfg":"fgh"}
y_object_basic.json {"asd":"sdf"}
y_object_duplicated_key.json {"a":"b","a":"c"}
y_object_duplicated_key_and_value.json {"a":"b","a":"b"}
y_object_empty.json {}
y_object_empty_key.json {"":0}
y_object_escaped_null_in_key.json {"foo\u0000bar": 42}
y_object_extreme_numbers.json { "min": -1.0e+28, "max": 1.0e ...
y_object_long_strings.json {"x":[{"id": "xxxxxxxxxxxxxxxx ...
y_object_simple.json {"a":[]}
y_object_string_unicode.json {"title":"\u041f\u043e\u043b\u ...
y_object_with_newlines.json { "a": "b" }
y_string_1_2_3_bytes_UTF-8_sequences.json ["\u0060\u012a\u12AB"]
y_string_accepted_surrogate_pair.json ["\uD801\udc37"]
y_string_accepted_surrogate_pairs.json ["\ud83d\ude39\ud83d\udc8d"]
y_string_allowed_escapes.json ["\"\\\/\b\f\n\r\t"]
y_string_backslash_and_u_escaped_zero.json ["\\u0000"]
y_string_backslash_doublequotes.json ["\""]
y_string_comments.json ["a/*b*/c/*d//e"]
y_string_double_escape_a.json ["\\a"]
y_string_double_escape_n.json ["\\n"]
y_string_escaped_control_character.json ["\u0012"]
y_string_escaped_noncharacter.json ["\uFFFF"]
y_string_in_array.json ["asd"]
y_string_in_array_with_leading_space.json [ "asd"]
y_string_last_surrogates_1_and_2.json ["\uDBFF\uDFFF"]
y_string_nbsp_uescaped.json ["new\u00A0line"]
y_string_nonCharacterInUTF-8_U+10FFFF.json ["􏿿"]
y_string_nonCharacterInUTF-8_U+FFFF.json ["￿"]
y_string_null_escape.json ["\u0000"]
y_string_one-byte-utf-8.json ["\u002c"]
y_string_pi.json ["π"]
y_string_reservedCharacterInUTF-8_U+1BFFF.json ["𛿿"]
y_string_simple_ascii.json ["asd "]
y_string_space.json " "
y_string_surrogates_U+1D11E_MUSICAL_SYMBOL_G_CLEF.json ["\uD834\uDd1e"]
y_string_three-byte-utf-8.json ["\u0821"]
y_string_two-byte-utf-8.json ["\u0123"]
y_string_u+2028_line_sep.json ["
"]
y_string_u+2029_par_sep.json ["
"]
y_string_uEscape.json ["\u0061\u30af\u30EA\u30b9"]
y_string_uescaped_newline.json ["new\u000Aline"]
y_string_unescaped_char_delete.json [""]
y_string_unicode.json ["\uA66D"]
y_string_unicodeEscapedBackslash.json ["\u005C"]
y_string_unicode_2.json ["⍂㈴⍂"]
y_string_unicode_escaped_double_quote.json ["\u0022"]
y_string_unicode_U+10FFFE_nonchar.json ["\uDBFF\uDFFE"]
y_string_unicode_U+1FFFE_nonchar.json ["\uD83F\uDFFE"]
y_string_unicode_U+200B_ZERO_WIDTH_SPACE.json ["\u200B"]
y_string_unicode_U+2064_invisible_plus.json ["\u2064"]
y_string_unicode_U+FDD0_nonchar.json ["\uFDD0"]
y_string_unicode_U+FFFE_nonchar.json ["\uFFFE"]
y_string_utf8.json ["€𝄞"]
y_string_with_del_character.json ["aa"]
y_structure_lonely_false.json false
y_structure_lonely_int.json 42
y_structure_lonely_negative_real.json -0.1
y_structure_lonely_null.json null
y_structure_lonely_string.json "asd"
y_structure_lonely_true.json true
y_structure_string_empty.json ""
y_structure_trailing_newline.json ["a"]
y_structure_true_in_array.json [true]
y_structure_whitespace_array.json []
n_array_1_true_without_comma.json [1 true]
n_array_a_invalid_utf8.json [a]
n_array_colon_instead_of_comma.json ["": 1]
n_array_comma_after_close.json [""],
n_array_comma_and_number.json [,1]
n_array_double_comma.json [1,,2]
n_array_double_extra_comma.json ["x",,]
n_array_extra_close.json ["x"]]
n_array_extra_comma.json ["",]
n_array_incomplete.json ["x"
n_array_incomplete_invalid_value.json [x
n_array_inner_array_no_comma.json [3[4]]
n_array_invalid_utf8.json []
n_array_items_separated_by_semicolon.json [1:2]
n_array_just_comma.json [,]
n_array_just_minus.json [-]
n_array_missing_value.json [ , ""]
n_array_newlines_unclosed.json ["a", 4 ,1,
n_array_number_and_comma.json [1,]
n_array_number_and_several_commas.json [1,,]
n_array_spaces_vertical_tab_formfeed.json [" a"\f]
n_array_star_inside.json [*]
n_array_unclosed.json [""
n_array_unclosed_trailing_comma.json [1,
n_array_unclosed_with_new_lines.json [1, 1 ,1
n_array_unclosed_with_object_inside.json [{}
n_incomplete_false.json [fals]
n_incomplete_null.json [nul]
n_incomplete_true.json [tru]
n_multidigit_number_then_00.json 123
n_number_++.json [++1234]
n_number_+1.json [+1]
n_number_+Inf.json [+Inf]
n_number_-01.json [-01]
n_number_-1.0..json [-1.0.]
n_number_-2..json [-2.]
n_number_-NaN.json [-NaN]
n_number_.-1.json [.-1]
n_number_.2e-3.json [.2e-3]
n_number_0.1.2.json [0.1.2]
n_number_0.3e+.json [0.3e+]
n_number_0.3e.json [0.3e]
n_number_0.e1.json [0.e1]
n_number_0e+.json [0e+]
n_number_0e.json [0e]
n_number_0_capital_E+.json [0E+]
n_number_0_capital_E.json [0E]
n_number_1.0e+.json [1.0e+]
n_number_1.0e-.json [1.0e-]
n_number_1.0e.json [1.0e]
n_number_1eE2.json [1eE2]
n_number_1_000.json [1 000.0]
n_number_2.e+3.json [2.e+3]
n_number_2.e-3.json [2.e-3]
n_number_2.e3.json [2.e3]
n_number_9.e+.json [9.e+]
n_number_expression.json [1+2]
n_number_hex_1_digit.json [0x1]
n_number_hex_2_digits.json [0x42]
n_number_Inf.json [Inf]
n_number_infinity.json [Infinity]
n_number_invalid+-.json [0e+-1]
n_number_invalid-negative-real.json [-123.123foo]
n_number_invalid-utf-8-in-bigger-int.json [123]
n_number_invalid-utf-8-in-exponent.json [1e1]
n_number_invalid-utf-8-in-int.json [0]
n_number_minus_infinity.json [-Infinity]
n_number_minus_sign_with_trailing_garbage.json [-foo]
n_number_minus_space_1.json [- 1]
n_number_NaN.json [NaN]
n_number_neg_int_starting_with_zero.json [-012]
n_number_neg_real_without_int_part.json [-.123]
n_number_neg_with_garbage_at_end.json [-1x]
n_number_real_garbage_after_e.json [1ea]
n_number_real_without_fractional_part.json [1.]
n_number_real_with_invalid_utf8_after_e.json [1e]
n_number_starting_with_dot.json [.123]
n_number_U+FF11_fullwidth_digit_one.json [１]
n_number_with_alpha.json [1.2a-3]
n_number_with_alpha_char.json [1.8011670033376514H-308]
n_number_with_leading_zero.json [012]
n_object_bad_value.json ["x", truth]
n_object_bracket_key.json {[: "x"}
n_object_comma_instead_of_colon.json {"x", null}
n_object_double_colon.json {"x"::"b"}
n_object_emoji.json {🇨🇭}
n_object_garbage_at_end.json {"a":"a" 123}
n_object_key_with_single_quotes.json {key: 'value'}
n_object_lone_continuation_byte_in_key_and_trailing_comma.json {"":"0",}
n_object_missing_colon.json {"a" b}
n_object_missing_key.json {:"b"}
n_object_missing_semicolon.json {"a" "b"}
n_object_missing_value.json {"a":
n_object_no-colon.json {"a"
n_object_non_string_key.json {1:1}
n_object_non_string_key_but_huge_number_instead.json {9999E9999:1}
n_object_repeated_null_null.json {null:null,null:null}
n_object_several_trailing_commas.json {"id":0,,,,,}
n_object_single_quote.json {'a':0}
n_object_trailing_comma.json {"id":0,}
n_object_trailing_comment.json {"a":"b"}/**/
n_object_trailing_comment_open.json {"a":"b"}/**//
n_object_trailing_comment_slash_open.json {"a":"b"}//
n_object_trailing_comment_slash_open_incomplete.json {"a":"b"}/
n_object_two_commas_in_a_row.json {"a":"b",,"c":"d"}
n_object_unquoted_key.json {a: "b"}
n_object_unterminated-value.json {"a":"a
n_object_with_single_string.json { "foo" : "bar", "a" }
n_object_with_trailing_garbage.json {"a":"b"}#
n_single_space.json
n_string_1_surrogate_then_escape.json ["\uD800\"]
n_string_1_surrogate_then_escape_u.json ["\uD800\u"]
n_string_1_surrogate_then_escape_u1.json ["\uD800\u1"]
n_string_1_surrogate_then_escape_u1x.json ["\uD800\u1x"]
n_string_accentuated_char_no_quotes.json [é]
n_string_backslash_00.json ["\"]
n_string_escaped_backslash_bad.json ["\\\"]
n_string_escaped_ctrl_char_tab.json ["\ "]
n_string_escaped_emoji.json ["\🌀"]
n_string_escape_x.json ["\x00"]
n_string_incomplete_escape.json ["\"]
n_string_incomplete_escaped_character.json ["\u00A"]
n_string_incomplete_surrogate.json ["\uD834\uDd"]
n_string_incomplete_surrogate_escape_invalid.json ["\uD800\uD800\x"]
n_string_invalid-utf-8-in-escape.json ["\u"]
n_string_invalid_backslash_esc.json ["\a"]
n_string_invalid_unicode_escape.json ["\uqqqq"]
n_string_invalid_utf8_after_escape.json ["\"]
n_string_leading_uescaped_thinspace.json [\u0020"asd"]
n_string_no_quotes_with_bad_escape.json [\n]
n_string_single_doublequote.json "
n_string_single_quote.json ['single quote']
n_string_single_string_no_double_quotes.json abc
n_string_start_escape_unclosed.json ["\
n_string_unescaped_crtl_char.json ["aa"]
n_string_unescaped_newline.json ["new line"]
n_string_unescaped_tab.json [" "]
n_string_unicode_CapitalU.json "\UA66D"
n_string_with_trailing_garbage.json ""x
n_structure_100000_opening_arrays.json [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ ...
n_structure_angle_bracket_..json <.>
n_structure_angle_bracket_null.json []
n_structure_array_trailing_garbage.json [1]x
n_structure_array_with_extra_array_close.json [1]]
n_structure_array_with_unclosed_string.json ["asd]
n_structure_ascii-unicode-identifier.json aå
n_structure_capitalized_True.json [True]
n_structure_close_unopened_array.json 1]
n_structure_comma_instead_of_closing_brace.json {"x": true,
n_structure_double_array.json [][]
n_structure_end_array.json ]
n_structure_incomplete_UTF8_BOM.json {}
n_structure_lone-invalid-utf-8.json
n_structure_lone-open-bracket.json [
n_structure_no_data.json
n_structure_null-byte-outside-string.json []
n_structure_number_with_trailing_garbage.json 2@
n_structure_object_followed_by_closing_object.json {}}
n_structure_object_unclosed_no_value.json {"":
n_structure_object_with_comment.json {"a":/*comment*/"b"}
n_structure_object_with_trailing_garbage.json {"a": true} "x"
n_structure_open_array_apostrophe.json ['
n_structure_open_array_comma.json [,
n_structure_open_array_object.json [{"":[{"":[{"":[{"":[{"":[{"": ...
n_structure_open_array_open_object.json [{
n_structure_open_array_open_string.json ["a
n_structure_open_array_string.json ["a"
n_structure_open_object.json {
n_structure_open_object_close_array.json {]
n_structure_open_object_comma.json {,
n_structure_open_object_open_array.json {[
n_structure_open_object_open_string.json {"a
n_structure_open_object_string_with_apostrophes.json {'a'
n_structure_open_open.json ["\{["\{["\{["\{
n_structure_single_eacute.json
n_structure_single_star.json *
n_structure_trailing_#.json {"a":"b"}#{}
n_structure_U+2060_word_joined.json [⁠]
n_structure_uescaped_LF_before_string.json [\u000A""]
n_structure_unclosed_array.json [1
n_structure_unclosed_array_partial_null.json [ false, nul
n_structure_unclosed_array_unfinished_false.json [ true, fals
n_structure_unclosed_array_unfinished_true.json [ false, tru
n_structure_unclosed_object.json {"asd":"asd"
n_structure_unicode-identifier.json å
n_structure_UTF8_BOM_no_data.json 
n_structure_whitespace_formfeed.json [ ]
n_structure_whitespace_U+2060_word_joiner.json [⁠]
i_number_double_huge_neg_exp.json [123.456e-789]
i_number_huge_exp.json [0.4e0066999999999999999999999 ...
i_number_neg_int_huge_exp.json [-1e+9999]
i_number_pos_double_huge_exp.json [1.5e+9999]
i_number_real_neg_overflow.json [-123123e100000]
i_number_real_pos_overflow.json [123123e100000]
i_number_real_underflow.json [123e-10000000]
i_number_too_big_neg_int.json [-1231231231231231231231231231 ...
i_number_too_big_pos_int.json [100000000000000000000]
i_number_very_big_negative_int.json [-2374623746732768942798327498 ...
i_object_key_lone_2nd_surrogate.json {"\uDFAA":0}
i_string_1st_surrogate_but_2nd_missing.json ["\uDADA"]
i_string_1st_valid_surrogate_2nd_invalid.json ["\uD888\u1234"]
i_string_incomplete_surrogates_escape_valid.json ["\uD800\uD800\n"]
i_string_incomplete_surrogate_and_escape_valid.json ["\uD800\n"]
i_string_incomplete_surrogate_pair.json ["\uDd1ea"]
i_string_invalid_lonely_surrogate.json ["\ud800"]
i_string_invalid_surrogate.json ["\ud800abc"]
i_string_invalid_utf-8.json [""]
i_string_inverted_surrogates_U+1D11E.json ["\uDd1e\uD834"]
i_string_iso_latin_1.json [""]
i_string_lone_second_surrogate.json ["\uDFAA"]
i_string_lone_utf8_continuation_byte.json [""]
i_string_not_in_unicode_range.json [""]
i_string_overlong_sequence_2_bytes.json [""]
i_string_overlong_sequence_6_bytes.json [""]
i_string_overlong_sequence_6_bytes_null.json [""]
i_string_truncated-utf-8.json [""]
i_string_UTF-16LE_with_BOM.json [""]
i_string_UTF-8_invalid_sequence.json ["日ш"]
i_string_utf16BE_no_BOM.json [""]
i_string_utf16LE_no_BOM.json [""]
i_string_UTF8_surrogate_U+D800.json [""]
i_structure_500_nested_arrays.json [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ ...
i_structure_UTF-8_BOM_empty_object.json {}

JSON Checker

jsoncons-0.179.0
nlohmann-3.11.2
rapidjson-2020-02-08
jsoncpp-1.9.5
taojson-2020-09-14
Expected result34 31 31 27 31
Expected success, parsing failed0 4 4 0 4
Expected failure, parsing succeeded1 0 0 8 0
Result undefined, parsing succeeded0 0 0 0 0
Result undefined, parsing failed0 0 0 0 0
Process stopped0 0 0 0 0
jsoncons
nlohmann
rapidjson
jsoncpp
taojson
pass1.json [ "JSON Test Pattern pass1 ...
pass2.json [[[[[[[[[[[[[[[[[[["Not too de ...
pass3.json { "JSON Test Pattern pass3 ...
pass4.json "A JSON payload can be string. ...
fail10.json {"Extra value after close": tr ...
fail11.json {"Illegal expression": 1 + 2}
fail12.json {"Illegal invocation": alert() ...
fail13.json {"Numbers cannot have leading ...
fail14.json {"Numbers cannot be hex": 0x14 ...
fail15.json ["Illegal backslash escape: \x ...
fail16.json [\naked]
fail17.json ["Illegal backslash escape: \0 ...
fail18.json [[[[[[[[[[[[[[[[[[[["Too deep" ...
fail19.json {"Missing colon" null}
fail2.json ["Unclosed array"
fail20.json {"Double colon":: null}
fail21.json {"Comma instead of colon", nul ...
fail22.json ["Colon instead of comma": fal ...
fail23.json ["Bad value", truth]
fail24.json ['single quote']
fail25.json [" tab character in string "]
fail26.json ["tab\ character\ in\ str ...
fail27.json ["line break"]
fail28.json ["line\ break"]
fail29.json [0e]
fail3.json {unquoted_key: "keys must be q ...
fail30.json [0e+]
fail31.json [0e+-1]
fail32.json {"Comma instead if closing bra ...
fail33.json ["mismatch"}
fail4.json ["extra comma",]
fail5.json ["double extra comma",,]
fail6.json [ , "<-- missing value"]
fail7.json ["Comma after the close"],
fail9.json {"Extra comma": true,}