DOC-6842 Add redis-rb (Ruby) JSON docs

[andy-stark-redis]

Adds Ruby (redis-rb) coverage for the JSON data type.

What's here

• Example: local_examples/tmp/datatypes/json/dt_json.rb — a Ruby port of the shared json_tutorial doctest set (all 18 steps), using redis-rb's json_* methods. This also demonstrates redis-rb's raw: option (pass an already-encoded JSON string / get the unparsed JSON string back) on the set_get, arr, arr2, and obj steps.
• Command mappings: redis_rb method signatures added to the 22 JSON.* command-api-mapping files (descriptions from redis-rb's YARD docs), with data/command-api-mapping.json regenerated via build/merge-command-api-mapping.sh.

Notes for reviewers

• The Ruby tab on the JSON data-type page is generated from dt_json.rb at build time via build/local_examples.py (.rb → the Ruby tab). data/examples.json is git-ignored/generated, so it is intentionally not in this diff — nothing to hand-add there.
• The raw: lines are Ruby-only by design (it's a redis-rb-specific kwarg); the other clients on these shared json_tutorial steps have no equivalent, so they're deliberately not mirrored to their tabs.
• Foundation for the redis-rb Query Engine docs (DOC-6843 Add redis-rb (Ruby) Query Engine docs: queryjson #3641), which index JSON documents.

Verification

dt_json.rb runs green against the released redis-rb 6.0.0 gem (published to rubygems.org 2026-07-31) on Redis 8.8 with the JSON module — exit 0, all 18 assert_equal blocks pass. redis-rb 6.0.0 is a breaking major (RESP3 by default); it changed none of the json_* return shapes.

[github-actions]

DOC-6842

[github-actions]

🧠 Redis Memory

Found 5 related items from repository history:

• PR — DOC-6843 Add redis-rb (Ruby) Query Engine docs: queryjson [PARKED]

  Preemptive docs for redis-rb's Query Engine (RediSearch / FT.*): a new "Index and query documents" page for Ruby (`content/develop/cli

• PR — DOC-6829 Add preemptive Spring Data Redis JSON docs [PARKED]

  Summary

• PR — DOC-6854 Add redis-rb (Ruby) vector search docs: vecsearch page + ruby_home_query_vec [PARKED]

  Preemptive docs for redis-rb's Query Engine vector search: a new "Index and query vectors" page for Ruby (`content/develop/clients/ruby/

• Commit — DOC-6887 Fix hash field expiration examples after harness verification

  DOC-6887 Fix hash field expiration examples after harness verification

• PR — DEV/OP: docs for Redis 8.10

  This is the final PR for Redis Open Source 8.10. Each individual commit has been reviewed by PM and peers; it just needs a rubber stamp so I

Memory updated at 6c69e3f

[andy-stark-redis]

Unpark reflection (predicted vs actual) — 2026-07-31

redis-rb 6.0.0 was published to rubygems.org on 2026-07-31 (07:14 UTC), the first release later than v5.4.1 to carry lib/redis/commands/modules/json.rb. Trigger fired.

• Predicted at park: possible signature/return-shape drift in json.rb between fork master (fa90f44) and the eventual release.
• Actual: zero drift — v6.0.0's json.rb is the identical commit fa90f44; the compare fa90f44...v6.0.0 touches no module file (only adds an unrelated upstream example).
• Runtime re-verify: dt_json.rb ran green against the released 6.0.0 gem on Redis 8.8 (ReJSON) — exit 0, all 18 assert_equal blocks. The 6.0.0 RESP3-as-default change did not alter any json_* return shape.
• Reconciliation: none needed — this PR adds no .md page (example + 23 JSON.* mappings only); data/examples.json stays git-ignored/generated.

Branch merged up to date with main (109 commits, no conflicts); hugo --gc builds clean (the two pre-existing REF_NOT_FOUND warnings are in operate/rs/8.0/flex/_index.md, unrelated). Ready for /finalize.