# loggerhead/json4u

Repository: https://github.com/loggerhead/json4u
Canonical: https://ross.abutalabs.com/products/json4u
Homepage: https://json4u.com
Language: TypeScript
License: Apache-2.0
License Family: permissive
Last push: 2026-07-28T22:39:46+00:00

## Health v2 (maintenance only)
Score: 75/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 94, release rhythm 35, longevity 100
- inputs: {"age_days": 1676, "days_push": 36, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3228, forks 235 (observed 2026-08-28T04:07:50.053695+00:00)

## What it is
JSON For You (json4u) is an open-source web application for visualizing, editing, formatting, validating, and comparing JSON data. It offers graph and table views, structured/text diffing, jq command support, and CSV import/export through a polished browser UI.

## Use cases
- visualize json as a graph or table
- compare two json files and find differences
- format and validate json with error context
- run jq queries on json data
- convert json to csv and back
- debug large json api responses
- preview urls, timestamps, and images inside json values

## When to choose
- you need an interactive visual tool to explore or diff JSON in a browser
- you want jq support combined with graph/table views in one UI
- you work with JSON files up to several megabytes and need fast rendering
- you want to self-host a JSON toolkit

## When to avoid
- you need a headless CLI or programmatic JSON processing library
- you need JSONL or JSONC support, which is still on the roadmap
- you need a lightweight editor plugin rather than a full web app

## Facets
- artifact type: application
- maturity: active
- function: json, data-visualization, parser, developer-tools, csv, charts
- domain: developer-tools, web-development, data-visualization, files
- platform: browser
- tags: json-viewer, json-comparison, jq, graph-view, table-view, json-formatter, online-tool, web-server, nodejs, typescript

## Member repositories
- loggerhead/json4u (main) score 75

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:50.053695+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:43:57.570451+00:00, confidence not recorded.
  - readme: https://github.com/loggerhead/json4u (fetched 2026-08-28T04:07:50.053695+00:00, sha 0ed3c4553fb7)
  - homepage: https://json4u.com (fetched 2026-08-29T09:37:53.470638+00:00, sha 68fb72e2f917)
  - site_page: https://json4u.com/changelog (fetched 2026-08-29T09:37:53.479613+00:00, sha 1d531a1805b1)
- Data as of 2026-08-30T08:39:29.467469+00:00.