{ } jsonbloom
JSON visualizer · browser-based

JSON Visualizer — paste, view & edit instantly

{ } jsonbloom renders your data as an interactive graph — pan, zoom, edit values, add keys. No install, no account, your data never leaves the browser.

Live preview Edit in graph 100% client-side

JSON visualization, simple and fast

{ } jsonbloom is built to render even large JSON files smoothly. Collapse and expand nodes, pan and zoom, and grasp the whole structure at a glance. No data is ever sent to a server — everything runs in your browser.

Before · After

From a wall of brackets to a graph you can read at a glance.

Raw JSON
{
  "user": {
    "name": "Ada",
    "age": 30
  },
  "tags": ["json", "viz"]
}
Visualized

Features

Instant Visualization

The moment you paste JSON, it's drawn as a graph in the right pane. Objects, arrays, and primitive values are split into color-coded nodes.

Editor Tools

Format, minify, and copy with one click. Syntax highlighting and line numbers make writing JSON comfortable.

Runs in Your Browser

No data is sent to a server. Paste sensitive JSON safely — everything is processed on the client side.

What is a JSON Visualizer?

JSON (JavaScript Object Notation) is a human-readable data format widely used in APIs and configuration files. Following complex, deeply nested JSON structures as plain text gets hard fast. A JSON visualizer turns that structure into a graph of nodes and connections, so you can see at a glance which field connects where, how many elements an array contains, and how objects nest into each other. { } jsonbloom is a browser-based JSON viewer built for developers, API-focused engineers, and data analysts.

When developers reach for a JSON visualizer

API responses

Inspect a 200‑line REST or GraphQL response without scrolling — see which arrays are empty, which fields are null, and how nested resources connect at a glance.

Config files

Make sense of tsconfig.json, package.json, app.json, or any deeply nested settings file. Edit values inline and copy the formatted result back into your project.

Webhook & log payloads

Stripe events, GitHub webhooks, Sentry payloads — paste them in to find the exact field you need without grepping through raw text.

Schema design

Sketch a new JSON shape live in the graph. Add keys, nest objects, and watch the structure form before you write a single line of code.

How to read deeply nested JSON

Reading deeply nested JSON as plain text is hard because every level adds vertical distance between a key and its value. Following response.data.user.profile.address.city in a 400‑line response means scrolling, counting brackets, and losing your place. { } jsonbloom flattens that mental cost: each object or array becomes a node, primitive values stay inline, and edges show how things connect. You read the structure the way you'd read a small diagram on a whiteboard.

  • Scan top‑down. The root node tells you the overall shape — object or array, and how many top‑level keys.
  • Follow the edges. Each edge is one level deeper. Click any node to collapse or expand its subtree.
  • Edit in place. Click a value to change it; click a key to rename it; the editor on the left stays in sync.
  • Use the toolbar. Format pretty‑prints, Minify strips whitespace, Copy grabs the current state, Full Screen hides the page chrome for focused work.

Common JSON validation errors (and quick fixes)

  • Trailing comma — {"a": 1,} is not valid JSON. Remove the comma after the last value.
  • Single quotes — JSON requires double quotes around keys and strings. Replace 'foo' with "foo".
  • Unquoted keys — { a: 1 } is JavaScript, not JSON. Wrap keys in double quotes.
  • Missing closing bracket — count opens vs closes. The status bar shows the line and column where the parser gave up.
  • Comments — JSON does not support // or /* */ comments. Use JSON5 or strip them first.
  • NaN, Infinity, undefined — not valid JSON values. Use null or a string.

Frequently Asked Questions

Does jsonbloom send my data to a server?

No. All JSON parsing and visualization happens entirely in your browser. Your data never leaves your device.

How large a JSON file is supported?

JSON up to a few megabytes renders smoothly. For very large files, nodes start collapsed by default and you can expand only the parts you need.

Is jsonbloom free?

Yes — jsonbloom is completely free to use. The site is supported by display ads.

Can I edit values directly in the graph?

Yes. Click any value, key, object, or array in the graph to edit it inline. You can also add and delete keys or array items, and the underlying JSON in the editor updates instantly.

Does it work offline?

After the first visit the page is cached by your browser, so basic editing works without a connection. Full offline support (PWA install) is on the roadmap.

What input formats are supported?

Standard JSON only (RFC 8259). JSON5, JSONC (with comments), and YAML are not supported.