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CLUSTER JSON-CONVERTER-ENCODING · 46 ENTRIES · EARLIEST ENTRY 2026-03-28

JSON formatting and validation tools

This cluster comprises web-based utilities for developers to format, validate, explore, and manipulate JSON data, often featuring syntax highlighting, tree views, and validation tools. The dated entry history before the index start is sparse and irregular, with entries appearing intermittently from February 2019 to June 2026. In terms of traction, nd-viewer leads with 5 stars, followed by ittools with 1 star and edge-json-formatter with 0 stars.

Entry timeline

ENTRY TIMELINE

FEB 2019: 1DEC 2019: 1MAR 2021: 1JAN 2022: 1SEP 2022: 1NOV 2022: 1JUL 2024: 1FEB 2025: 1AUG 2025: 1DEC 2025: 1FEB 2026: 1MAR 2026: 1JUN 2026: 1AUG 2026: 18SEP 2026: 13OCT 2026: 2
FEB 2019OCT 2026

Each bar is the month a member carries, which is a creation date where the source published one and a crawl date otherwise. Nothing in the index was found before 11 August 2026, and coverage broadened sharply on 14–15 August, so a bar from then on reports how much we found that month, not how much was built; an earlier bar reports how far back a member's own source dated it — not how long we have been watching.

Members by activity

Activity signals, not revenue.

Build origin · 1 ai-built · 2 hand-coded · 17 unlabelled

Operator · 11 hobby · 1 indie · 1 commercial · 1 open source · 6 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 20 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01daykit1★13 dayslivehobbySelf-hosted web toolbox offering utilities for JSON formatting, timestamp conversion, encoding, diffing, regex testing, JWT parsing, and config conversion.
  2. 02nd-viewer5★1 mo—hobbyDesktop app that opens huge newline-delimited JSON files quickly and lets users search, navigate, and fold nested records in a collapsible tree.
  3. 03edge-json-formatter0★19 days—hobbyBrowser extension that formats JSON from web responses into a collapsible syntax-highlighted tree and includes a paste-based JSON formatter.
  4. 04vy-bin0★25 daysliveopen sourceCommand-line tool for exploring and querying JSON and YAML data.
  5. 05format-lab0★15 dayslivehobbyWeb tool that converts, formats, and validates JSON, YAML, TOML, XML, CSV, and SQL files locally in the browser without uploading data.
  6. 06json-tools0★23 days—Desktop workbench for formatting, converting, comparing, and validating JSON data, including schema checks, type generation, and code screenshot export.
  7. 07web0★24 days—hobbyWeb app that translates JSON translation files into many languages using the user's own DeepL API key entirely in the browser.
  8. 08BroadcastViewer0★17 dayslivehobbyWeb app that ingests JSON and XML broadcast payloads and lets users inspect, search, and explore the data in real time.
  9. 09preact-dev-log-explorer0★2 dayslivehobbyWeb app that lets developers explore JSONL log files with fuzzy search, faceted filters, timelines, trace correlation, saved queries, notes, and filtered export.
  10. 10dev-tools0★5 days—indieCollection of free client-side web tools for JSON formatting, hashing, JWT decoding, image compression, and invoicing.
  11. 11nn_viewer0★24 days—hobbyWeb app that formats, validates, and browses JSON documents with expandable tree and raw views.
  12. 12Jayson0★1 molivecommercialJSON viewer and editor for iPhone and iPad that browses structured data, edits values, and saves to files.
  13. 13featured-working-tools0★27 daysliveWeb workbench hosting practical tools for JSON contracts, interviews, email preflight, and a working commerce storefront.
  14. 14Nexus-Ecosystem0★1 mo—Unified full-stack web platform combining a landing page, interactive algorithm visualizer, and developer utilities for JSON and regex work.
  15. 15gradio-langchain-json-rag0★1 mo—An interactive Q&A application that allows users to query custom JSON datasets using semantic search.
  16. 16synthetic-canvas-pro0★1 moliveai-builthobbyWeb tool that converts JSON/JSONL files into Excel spreadsheets, with data editing and visualization features.
  17. 17json-editor0★1 mo—hobbyWeb-based JSON editor and toolbox for formatting, validating, converting, diffing, and generating code types from JSON, with shareable links.
  18. 18devtoolyard0★1 mo—hand-codedhobbyFree browser-based suite of developer and text tools for JSON, conversions, encoding, and counting, with no sign-up required.
  19. 19JSON Utilities0★1 yrabandonedliveJSON editor that validates, formats, minifies, and escapes data with a distraction-free interface.
  20. 20Power JSON Editor Mobile0★4 yrabandonedlivehand-codedJSON editor for iPhone and iPad that lets developers browse, validate, and edit JSON files with a tree view and a text editor.

Ranked by traction, highest first, and paged 20 at a time — this is a window on the cluster, never the whole of it. Ties are broken by a stable id so a product cannot appear on two pages or fall between them. Browse every cluster.