This is an IBM i port of YAJL, a very fast JSON parser/generator created by Lloyd Hilaiel of Mozilla fame.

Using the tool from RPG is described in the following blog post:

You may also be interested in the handout (PDF of Powerpoint slides) for the talk I give on using YAJL from RPG:

For instructions on how to install YAJL, please download the main YAJL file (YAJL.zip, below) and see the README.txt file inside the ZIP file.

Updates:

• March 27, 2014 to fix bugs with un-escaping of escaped strings, and pointer error in yajl_get_number.
• April 4, 2014 to fix bug interpreting true/false values.
• October 31, 2015 to enable support for escaping solidus and fix bug with yajl_tree_free.
• February 24, 2017 to add yajl_stringify() routine.
• March 31, 2017 to workaround problems in QtmhWrStout with large JSON buffers.
• September 29, 2017 to add yajl_stringifyStr, yajl_copyBufStr and yajl_string_load_tree routines.
• March 9, 2018 to add yajl_genFromNode routine.
• April 17, 2018 to add support for RPG's DATA-INTO opcode.
• May 17, 2018 added additional options to YAJLINTO.
• Oct 1, 2018 added *STDIN support to YAJLINTO.
• July 29, 2019 added YAJLGEN utility, and ability to write *STDIN data to IFS.
• November 25, 2019 added YAJLDTAGEN (DATA-GEN interface), and yajl_addPreformattedPtr routine.
• June 8, 2020 added new option "include empty arrays" to YAJLDTAGEN.
• Oct 14, 2020 added yajl_clearBuf routine to clear generator buffer, and yajl_addNumF to help format numbers.
• Jan 21, 2022 added YAJL_MEMORY_STATUS environment variable. Set it to an IFS path, and YAJLINTO will write a report showing how many objects are allocated in memory when YAJLINTO finishes parsing a document.
• July 16, 2022 added new option "skip_nulls" to YAJLINTO. If set to true, it will skip elements that are set to null (as if they are not in the JSON document.)
• October 19, 2022 added new subprocedure YAJL_get_bignumber() to return numbers at packed(63:20). This addresses concerns that yajl_get_number() is limited to packed(30:9).
• August 16, 2023 Eliminate problems with yajl_get_number/yajl_get_bignumber when number is in floating point notation.
• September 9, 2023 YAJLINTO now copies document buffer into teraspace to eliminate 16mb limit.
• September 18, 2023 YAJLINTO now detects numeric json elements in floating point notation and converts them to decimal notation to avoid limitations in DATA-INTO.
• April 9, 2024 make yajl_get_number and yajl_get_bignumber operate independently of the user's locale when interpreting numbers in floating point notation. Also added YAJL_addPreformattedUTF8Ptr.
• April 11, 2024 Added support for ISO 8601 timestamps in YAJLR4 via YAJL_addTimestamp and YAJL_get_timestamp. Also added some stuff for compatibility with MDREST4i's YAJL support.
• May 2, 2024 Added support for adding new values to a tree node via the YAJL_object_insert and YAJL_array_add routines.
• May 3, 2024 Added an addditional parameter to the YAJL_addXXXX procedures to allow you to set the value to NULL (easier than calling YAJL_addNull manually)
• Jun 6, 2024 Fix regression of yajl_addnumf(*omit:val) since null support added in May
• Sep 6, 2024 Clear cached element name for null elements when skip_null: true
• Sep 30, 2024 Add routines YAJL_getPathComp, YAJL_urlDecode