Raw JSON Input

Waiting for JSON content

Start typing on the left or load one of the sample payloads to inspect it instantly.

RFC 8259 Compliant & 100% Client-Side

JSON Formatter Online — Free Beautifier, Validator & Viewer

PrettyJSON is a free set of online JSON tools that run entirely in your browser. Use it to format JSON, beautify minified payloads, validate syntax, minify JSON, auto-repair broken JSON, and inspect nested data in a tree view — with nothing uploaded to a server, even offline once the page has loaded.

Explore Specialized JSON Tools

JSON Formatter

Format & beautify raw JSON with 2-space or 4-space indentation.

JSON Beautifier

Beautify & indent minified JSON with customizable 2-space or 4-space formatting.

JSON Minifier

Compress JSON payloads onto 1 line & calculate bandwidth savings.

JSON Validator

Real-time RFC 8259 syntax checker with exact line & column error pinpointing.

JSON Tree Viewer

Inspect nested API responses with interactive node expansion & key search.

JSON Repair

Auto-Fix

Auto-fix single quotes, trailing commas, unquoted keys, and JS comments.

JSON Sorter

Sort JSON object keys alphabetically (A–Z or Z–A) recursively across all nested levels.

JSON Compare

Diff

Side-by-side semantic diff with LCS array alignment. Detect added, removed, and modified keys instantly.

JSON to CSV

Convert a JSON array of objects to CSV. Nested keys flattened to dot-notation columns.

CSV to JSON

Convert CSV to a JSON array of objects with automatic number & boolean type inference.

JSON to YAML

Convert JSON to clean, readable YAML for Kubernetes, CI pipelines, and config files.

YAML to JSON

Convert YAML manifests and configs into formatted, indented JSON.

Private & Offline Ready

Every tool runs in your browser, so the JSON you paste never leaves your device.

Works Instantly, Even Offline

Formatting, minifying, repairing, and the tree view all run on your device, so there are no uploads to wait on.

Exact Error Line & Column

Syntax errors like unescaped quotes and trailing commas are flagged with their exact line and column.

How PrettyJSON Compares to Server-Based JSON Tools

The main difference is where your data is processed — in your browser, or on someone else's server.

Feature	PrettyJSON.in	Server-Based Tools
Privacy & Security	Runs entirely in your browser	Your data is sent to a server
Speed & Performance	Processes instantly on your device	Depends on a network round-trip
View Modes	Text editor and interactive tree view	Varies by tool
JSON Auto-Repair	Built-in one-click repair	Varies by tool
Error Handling	Exact line and column highlighting	Varies by tool

Programmatic JSON Pretty Printing Examples

How to format and beautify JSON programmatically across languages and command line tools.

JavaScript (Browser / Node.js)

const data = { name: "PrettyJSON", rating: 5, active: true };
// Pretty print with 2-space indentation
const formatted = JSON.stringify(data, null, 2);
console.log(formatted);

Python

import json

data = {"name": "PrettyJSON", "rating": 5, "active": True}
# Pretty print with 2-space indentation
formatted = json.dumps(data, indent=2)
print(formatted)

cURL & jq (Command Line)

# Fetch API response and beautify instantly with jq
curl -s https://api.example.com/data | jq '.'

# Compact / Minify JSON output
curl -s https://api.example.com/data | jq -c '.'

Frequently Asked Questions

Common questions and expert answers regarding this tool.

What is PrettyJSON.in?

PrettyJSON.in is a free set of browser-based JSON tools — a formatter, beautifier, validator, minifier, tree viewer, auto-repair, compare, and sorter, plus converters for CSV and YAML. Everything runs locally in your browser.

Is my JSON data safe on PrettyJSON.in?

Yes. Every tool runs in your browser, so the JSON you paste is never uploaded, logged, or stored on a server.

Does PrettyJSON work offline?

Yes. Once the page has loaded, the tools keep working without an internet connection, since all the processing happens on your device.