Life & fun · alternatives · 2026

24 alternatives to Bulk set properties recursively in complex JSON string trees

An Experimental Regex Engine to Parse and Apply Bulk Changes to a JSON String Without Using 'JSON.parse()' for Deserialization - patternhelloworld/json-knife

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Bulk set properties recursively in complex JSON string trees launched in 2022; newer entries below may have overtaken it.

1. 1
   Json-knife (update huge JSON string recursively with regex)▲6

   An Experimental Regex Engine to Parse and Apply Bulk Changes to a JSON String Without Using 'JSON.parse()' for Deserialization - patternhelloworld/json-knife

   2020 · github.com · its alternatives →

2. 2
   LLMs can generate valid JSON 100% of the time▲854

   Outlines is a Python library that focuses on text generation with large language models. Brandon and I are not LLM experts and started the project a few months ago because we wanted to understand better how the generation process works. Our original background is probabilistic, relational and symbolic programming. Recently we came up with a fast way to generate text that matches a regex (https://blog.normalcomputing.ai/posts/2023-07-27-regex-guide...). The basic idea is simple: regular expressions have an equivalent Deterministic-Finite Automaton (DFA) representation. We…

   2023 · github.com · its alternatives →

3. 3
   JsonTree, a tool for turning JSON data into a collapsible html tree▲9

   A lightweight vanilla Javascript micro-library for making collapsible trees with JSON - MaxLeiter/jsonTree

   2016 · github.com · its alternatives →

4. 4
   The Changelog - #189: JSON API with Yehuda Katz▲66

   Yehuda's start as a programmer and the spec for building API

   2016 · changelog.com · its alternatives →

5. 5JA
   JsonTree, a 3.53kb JavaScript tool for generating html trees from JSON▲78

   a lightweight dependency free javascript micro-library for making collapsable trees with JSON

   2017 · maxleiter.github.io · its alternatives →

6. 6AT
   Anything To JSON – a language model for structured extraction▲18

   Hey HN! Erik here from banana.dev We’ve trained a small(ish) language model on structured extraction, and today we’re launching a playground for it at https://anythingtojson.com. Give it a try! This model continues our work on structured generation, following last week’s launch of Fructose[1], a python client for strongly-typed LLM responses. There seem to be two distinct halves of the problem intended to be solved by Fructose and structured generation: 1. the reasoning ability of the model, such as performing chain of thought, creative acts, and natural language tasks. In a way,…

   2024 · anythingtojson.com · its alternatives →

7. 7
   jsoncompat – a library to detect/fuzz breaking changes in JSON schemas▲7

   jsoncompat: json schema compatibility checker

   Apr 2026 · jsoncompat.com · its alternatives →

8. 8
   Weird JSON superset with BigInt, Infinity, TypedArray etc▲67

   the JS/Node.JS library for encoding complex and unconventional data structures. Support for BigInts, TypedArrays, null, undefined, and Symbol. Multiple flavors available. - DO-SAY-GO/WeirdJSON

   2020 · github.com · its alternatives →

9. 9
   Semi-index - Speed up JSON parsing in MapReduce-like tasks▲9

   Implementation of the JSON semi-index described in the paper "Semi-Indexing Semi-Structured Data in Tiny Space" - ot/semi_index

   2011 · github.com · its alternatives →

10. 10
    Jsong: faster than light streaming JSON parser and writer in C▲9

    2017 · github.com · its alternatives →

11. 11RW
    Regexly – WYSIWYG Regex Playground for JavaScripters▲7

    2017 · regexly.chipto.io · its alternatives →

12. 12
    A lightweight JSON Parser without memory allocation in ~250 LOC▲9

    2014 · github.com · its alternatives →

13. 13
    JSONPlus: a json parser with self reference and templating▲7

    JSON parser that supports self reference and comments - serkanyersen/jsonplus

    2015 · github.com · its alternatives →

14. 14
    See – searchable JSON compression (offline 10-min demo)▲5

    Hi HN, I’m building SEE (Semantic Entropy Encoding): a searchable compression format for JSON/NDJSON. Goal: reduce the “data tax” (storage/egress) and “CPU tax” (decompress/parse) by keeping JSON searchable while compressed, with page-level random access. I just published a proof-first evaluation release: Offline DEMO ZIP (~10 min): prints compression ratios + skip rates + lookup latency (p50/p95/p99) DD pack: audit/repro evidence (decode mismatch=0, extended mismatch=0, audit PASS) Latest release:…

    Feb 2026 · gitlab.com · its alternatives →

15. 15
    Incremental JSON parser for streaming LLM tool calls in Ruby▲13

    Built this for streaming AI tool calls. LLMs stream function arguments as JSON character-by-character. Most parsers reparse from scratch each time - O(n²) behavior that causes UI lag. This maintains parsing state, processing only new characters. True O(n) performance that stays imperceptible throughout the entire response. Ruby gem, MIT licensed. Would love feedback.

    Oct 2025 · aha.io · its alternatives →

16. 16
    bote - A fast, modern and low-memory approach to processing a big JSON▲5

    A fast, modern and low-memory approach to processing a big JSON - jankdc/bote

    Jun 2026 · github.com · its alternatives →

17. 17AS
    A Super Simple JSON CMS▲8

    2018 · medium.com · its alternatives →

18. 18
    Searchable compression for JSON – ~99% page skip and sub-ms lookups▲15

    Problem JSON/NDJSON is everywhere in data platforms, but compression usually breaks searchability. You either keep queryable raw stores (high I/O/egress) or compress into gz/zstd blobs (cheap to store, painful to probe). The “cloud tax” shows up as wasted reads. What I built (SEE — Semantic Entropy Encoding) A schema-aware, searchable compression codec for JSON that keeps exists/pos lookups fast while still compressing. Internals: structure-aware delta + dictionaries, a PageDir + mini-index to jump to relevant pages, and a tuned Bloom filter that skips ~99% of pages.…

    2025 · github.com · its alternatives →

19. 19
    JSONBason▲15

    I've been at it again, just sharing my simple JSON data inspection tool, love webdev and single page apps, this one took 4 days and was a lot of fun. The code is not obfuscated so you can inspect it and see how it works (very simple, server side is even more simple) Pretty much just do a POST of your JSON data from within your code and it will convert it into a basic table for instant search and sort. Made with love for the fun of it, no ads, no paid anything, it's totally free. Please only send in sanitized/test data only, this is meant to help make webdev a bit easier and more fun.…

    2025 · jsonbason.com · its alternatives →

20. 20
    JSON Scout▲9

    Get Structured Data from Unstructured Content.

    2024 · jsonscout.com · its alternatives →

21. 21
    JSON-to-JSON mapping done easily▲14

    2019 · github.com · its alternatives →

22. 22JA
    jq, a lightweight commandline JSON processor▲5

    2012 · stedolan.github.com · its alternatives →

23. 23AO
    an order-preserving JSON encoding (so byte-order == value-order)▲7

    2010 · keyjson.org · its alternatives →

24. 24OP
    Object Playground - The definitive guide to object-oriented JavaScript▲5

    2013 · objectplayground.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →