JSON Pretty Print Tool & Viewer

How to Use

  1. 1Paste your JSON in the input panel on the left, or click "Upload" to load a JSON file.
  2. 2Choose an input mode such as Strict JSON, Lenient Repair, JSON5-like, or JSON Lines based on the source data.
  3. 3Tune indentation, sorting, unicode handling, tree collapse depth, and optional cleanup transforms in the formatter options.
  4. 4Review the Output Integrity strip to confirm whether normalization happened and whether duplicate key warnings were found.
  5. 5Search in code or tree view, then copy JSONPath, JSON Pointer, or a safe dot path from the selected node.
  6. 6Copy the strict JSON output or download it as JSON, then use the Workbench drawer for alternate exports like JS, YAML, or TypeScript.

Key Features

Strict Output Integrity

Every run reports parse mode, normalization, duplicate key warnings, cleanup status, size delta, and processing mode.

Lenient Input Modes

Normalize broken JSON, JSON5-like config files, or JSON Lines while still exporting strict-valid JSON.

Tree Review + Path Copy

Inspect nested structure in tree view, search matching branches, and copy JSONPath, JSON Pointer, or dot paths.

Formatter Profiles

Use targeted presets for API responses, config files, logs/JSON Lines, cleanup, and large-file review.

Large JSON Guardrails

The tool falls back to worker or simplified rendering modes for larger payloads to keep the UI responsive.

Privacy First

All processing happens in your browser. Your data never leaves your device.

Common Use Cases

API Response Debugging

Pretty-print minified payloads, sort top-level keys, inspect nested objects in tree view, and copy paths for downstream tools.

Configuration Files

Normalize JSON5-like config with comments and trailing commas into strict JSON before shipping or committing.

LLM Output Repair

Repair malformed JSON from AI, logs, or manual edits, then verify what changed in the integrity strip.

Audit / Documentation

Search payloads, copy JSONPath or JSON Pointer references, and export clean JSON for tickets, runbooks, or docs.

Frequently Asked Questions

What does this JSON Pretty Print Tool do?

It formats raw, minified, or messy JSON into strict-valid output that is easier to read, copy, review, and debug. You can switch between pretty, minified, and tree views while keeping the same parsed document.

Does it support broken JSON or JSON5-like input?

Yes. Strict JSON is the default, but you can switch to lenient repair or JSON5-like input modes to normalize comments, single quotes, trailing commas, and other common non-standard patterns before exporting strict JSON.

Does the tool warn about duplicate keys?

Yes. The formatter checks the raw input text for duplicate object keys and surfaces warnings in the integrity strip so you know when an object may be ambiguous before you rely on the output.

Can I search and inspect the JSON as a tree?

Yes. The tool includes a tree view with collapse depth controls, match-only browsing, search scopes for keys or values, and path-copy actions for JSONPath, JSON Pointer, and safe dot paths.

Is my JSON secure here?

Yes. All processing stays in your browser. There are no server uploads or payload storage, so your JSON remains local to your device while you format, inspect, and export it.

Related Tools

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JSON Path Finder

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Related Guides

Introduction to JSON

Learn what JSON is, why it matters, and how it became the universal data format.

Debugging JSON — DevTools, Postman & CLI

Master JSON debugging workflows: inspect API responses, test endpoints, and process JSON with jq.

Mastering jq — Command-Line JSON Processing

Filter, transform, and aggregate JSON on the command line with jq.

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