jsonyo — JSON Toolkit
jsonyo is a lightweight JSON toolkit that lives in wp-admin. Open it from Tools → JSON Toolkit and you get a clean code-editor-style workbench for everything JSON.
It is especially useful when you are working with:
- REST API responses and endpoints
- ACF exports and nested custom field payloads
- theme.json, block editor config, and site settings
- webhook payloads and internal JSON on staging sites
Six modes, one panel:
- Format — paste raw JSON, get a properly indented tree with syntax highlighting
- Validate — instant pass/fail with line + column for syntax errors
- Query — JSONPath ($.users[0].name, items[*].id, recursive ..key) over the parsed tree
- Diff — paste two JSON blocks, see added/removed/changed paths side-by-side
- Stats — counts of objects, arrays, strings, numbers, booleans, nulls + max depth
- Minify — strip whitespace, get one-line output ready to paste
Zero data leaves your browser
Every operation runs entirely in your browser via JavaScript. No external API call, no analytics, no upload. We never see your JSON. This means jsonyo works on private/internal JSON, on disconnected staging sites, on WordPress installs behind firewalls.
Why a wp-admin plugin and not just a website?
If you live in wp-admin (debugging REST API responses, inspecting block editor JSON, working with custom field exports, tracing webhook payloads), having a JSON workbench one click away beats opening a tab to an external tool. Same engine, same Surgical aesthetic, same monospace clarity — but it’s already there when you need it.
Free forever
This plugin has no paid tier, no upsell, no “Pro” upgrade. It’s free, GPLv2, and stays that way. The goal is simple: give WordPress developers a fast, private JSON workbench where they already work.
If you are deciding whether to install, start with the comparison page: https://voiddo.com/wordpress/jsonyo/compare/
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