Work · alternatives · 2026

24 alternatives to Semi-index - Speed up JSON parsing in MapReduce-like tasks

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

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Semi-index - Speed up JSON parsing in MapReduce-like tasks launched in 2011; newer entries below may have overtaken it.

1. 1
   JSON For You – Visualize JSON in graph or table views▲211

   After two years of improvement, I think it's time to share it with you all. Here’s a quick overview: - Common features include validation, formatting, minification, and more. - Visualize JSON in a graph or table view. - Structured comparison with fallback to text comparison. - Navigate though JSON using JSON pointer. - Supports jq. Would love to hear the community's questions, thoughts and comments!

   2024 · github.com · its alternatives →

2. 2
   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 →

3. 3
   A lightweight JSON Parser without memory allocation in ~250 LOC▲9

   2014 · github.com · its alternatives →

4. 4
   Jsong: faster than light streaming JSON parser and writer in C▲9

   2017 · github.com · its alternatives →

5. 5
   A Fast, Malloc-Free C++14 Json Parser and Encoder▲98

   Meta programming utilities for C++14. Merged in matt-42/lithium - matt-42/iod

   2014 · github.com · its alternatives →

6. 6
   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 →

7. 7
   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 →

8. 8
   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 →

9. 9
   A JSON database on the filesystem with indexes▲12

   :man: a simple, git diffable JSON database on yer filesystem. By the power of NodeJS - DO-SAY-GO/sirdb

   2020 · github.com · its alternatives →

10. 10
    Tantivy▲68

    A full-text, horse-speed search engine library in Rust

    2022 · github.com · its alternatives →

11. 11
    I created a lightweight JavaScript library to visualize JSON as a graph▲62

    Effortlessly visualize JSON structures as dynamic tree diagrams - The-01-Company/jsontr.ee

    2024 · github.com · its alternatives →

12. 12
    SPath is a Rust lib for query JSONPath over any semi-structured data▲35

    Query expressions for semi-structured data. Contribute to cratesland/spath development by creating an account on GitHub.

    2025 · github.com · its alternatives →

13. 13JA
    jq, a lightweight commandline JSON processor▲5

    2012 · stedolan.github.com · its alternatives →

14. 14
    Bulk set properties recursively in complex JSON string trees▲8

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

    2022 · github.com · its alternatives →

15. 15
    fastjson - Fast JSON Parsing for Go▲20

    Fast JSON parser and validator for Go. No custom structs, no code generation, no reflection - valyala/fastjson

    2018 · github.com · its alternatives →

16. 16
    JSON-to-JSON mapping done easily▲14

    2019 · github.com · its alternatives →

17. 17BJ
    Bitwise JSON Parser written in C▲6

    2014 · web.cs.dal.ca · its alternatives →

18. 18AT
    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 →

19. 19
    The fastest JSON parser for Go▲7

    THE fastest alternative JSON parser for Go that does not require schema - buger/jsonparser

    Jul 2026 · github.com · its alternatives →

20. 20
    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 →

21. 21IM
    Incremental MapReduce and the Model-View Problem▲10

    2017 · medium.com · its alternatives →

22. 22
    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 →

23. 23
    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.

    2025 · aha.io · its alternatives →

24. 24AS
    A Super Simple JSON CMS▲8

    2018 · medium.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 →