`JSONViewer`¶

Pretty-print bounded JSON-like data with recursive secret redaction.


Import	`from hedron import JSONViewer`
Distribution	`hedron`
Backend activity	No
Normal render mode	`RenderMode.FRAGMENT`

Live demo¶

{
  "job": 42,
  "status": "complete",
  "token": "***"
}

The preview is a local docs simulation (not a running Hedron server). Interactive demos show a “Simulated HTMX” trace when applicable.

Basic use¶

from hedron import JSONViewer

component = JSONViewer({'job': 42, 'status': 'complete', 'token': 'redacted automatically'})

Compose under Page for full documents, or return from a fragment route for HTMX swaps.

How it works¶

JSONViewer recursively redacts Secret instances and keys containing common secret, password, or token terms, limits list breadth and recursion depth, formats with indentation, and truncates final text.

This component's core behavior is server-rendered HTML and does not require a browser runtime. The preview is ordinary semantic HTML, so keyboard, form, link, and disclosure behavior comes from the platform.

Constructor and parameters¶

JSONViewer(value, *, max_chars=100_000)

Parameter	Type	Meaning
`value`	`Any`	JSON-like value.
`max_chars`	`int`	Hard text bound.

Composition and backend behavior¶

Keep JSONViewer at the smallest semantic boundary. Fragment routes should return only the replaced region and preserve stable target IDs across success, validation, empty, loading, and error responses.

This component is primarily presentational; keep any mutation on an explicit action or component route.

Accessibility¶

Introduce complex payloads and avoid forcing users to navigate huge trees in the primary task flow.

Security¶

Escaping and SafeUrl / TrustedHtml are framework concerns; authorization and data exposure remain application code. Redact secrets before rendering.

Common mistakes¶

Key-name redaction is defense in depth, not a complete data-loss-prevention system.
Do not copy docs-preview JavaScript into an application server.

Testing¶

from hedron import RenderMode, render

result = render(component, mode=RenderMode.FRAGMENT)
assert result.html
assert not result.diagnostics

All component demos · Built-in API · Testing

JSONViewer¶