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JSON Viewer

Browse JSON as a collapsible tree with syntax colors

How to Use JSON Viewer

  1. Open JSON Viewer above — it loads instantly, no signup or download required.
  2. Provide your input (paste text, drop a file, or type directly into the tool).
  3. Get your result instantly — everything is processed locally in your browser and nothing is uploaded.
  4. Copy or download the output. Refresh the page to clear all data from memory.

About JSON Viewer

What this page solves

Reading raw JSON in a text editor means counting brackets and scrolling past noise. JSON Viewer renders any JSON as a colour-coded, collapsible tree directly in your browser so you can drill into nested objects without uploading the data or installing a desktop client.

JSON Viewer turns any JSON payload into a colour-coded, collapsible tree in your browser — strings in green, numbers in blue, booleans in orange, `null` greyed out, with one-click expand/collapse on every object and array — so a 500 KB Stripe webhook or a deeply nested Firebase export becomes navigable in seconds without scrolling through walls of brackets. Paste JSON, upload a `.json` file, or fetch a public URL, and the tree opens with the first two levels expanded so you immediately see the shape of the data. Each branch shows its child count when collapsed (`12 items`, `8 keys`), so you can decide what to drill into without opening everything. It exists for the people who do not want to paste production JSON into jsonformatter.org or json-viewer.com just to see the structure: backend engineers exploring an unfamiliar API, mobile developers reading a remote-config blob, QA engineers spot-checking response payloads, and product managers reviewing exported analytics data on a locked-down work machine. Switch to the text tab for a flat formatted view, sort keys alphabetically for predictable navigation, or jump to the JSON Formatter when you need to copy a pretty-printed string, the JSONPath Tester to query specific fields, or the JSON to TypeScript tool to generate interfaces from the same payload. Runs entirely in your browser — no upload, no signup, no logs.

Common Use Cases

  • Browse a deeply nested Stripe, GitHub, or Slack API response through a collapsible tree
  • Explore a Firebase Realtime Database or Firestore export without loading it into an editor
  • Review a `package-lock.json` or `pnpm-lock.yaml`-derived JSON without scrolling thousands of lines
  • Hand a non-developer teammate a readable structural view of a complex JSON payload
  • Inspect a Postman or Insomnia export to find a saved request inside a large workspace dump
  • Read an OpenAI / Anthropic streaming response after concatenation, without uploading prompts

Related tools in Developer Tools

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Frequently asked questions

How to use JSON Viewer?

1) Open the tool. 2) Enter or upload your input. 3) Get your result instantly. Everything happens locally — nothing is uploaded.

When should I use JSON Viewer?

Use it when you need to browse the structure of a large API response, explore a Firebase or MongoDB export, or hand a non-developer teammate a readable view of a complex JSON payload.

Is JSON Viewer safe?

Yes. JSON Viewer runs 100% in your browser. Inputs are never uploaded, stored, or logged — safe for confidential content.

Will quality be affected by JSON Viewer?

JSON Viewer performs lossless operations — your content is not re-encoded or downgraded.

What formats does JSON Viewer support?

JSON Viewer supports JSON, YAML, XML, CSV, TOML and other developer-friendly text formats

Is JSON Viewer free?

Yes — JSON Viewer is completely free, with no registration, no watermarks, and no usage limits.

Is JSON Viewer different from JSON Formatter?

Same engine, different default view. JSON Formatter opens in the indented text view, JSON Viewer opens in the tree view. Both run locally in your browser and both let you switch between text and tree with a single click — pick the URL that matches the task you came for.

How are values colour-coded?

Strings render green, numbers blue, booleans orange, `null` grey-italic, object/array keys teal. The colour scheme is the same one VS Code and JetBrains IDEs use, so the visual cues transfer cleanly.

Can I copy a single nested value out of the tree?

For the full document, use Copy in the text view. For one branch, collapse the parent, switch to text view, and the formatted output reflects the same data — copy the relevant lines. A right-click "copy this branch" is coming in a future update.

Does it handle JSON Lines (NDJSON)?

Not directly — NDJSON is one JSON object per line, not a single document. Wrap the lines in `[` ... `]` separated by commas first, then paste. For log-style streams, the [LINK:JSON Formatter|/tool/json-formatter] is the right tool to validate each line individually.