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Developer JSON Workbench

Format, validate, fix, explore paths, generate TypeScript & SQL — all in one

100% in-browserNo signupFree forever

Developer JSON Workbench

Format, validate, fix, explore paths, generate TypeScript & SQL — all in one

Compare two JSONsMask JSON before sending to AI

Latest: AI Safety & Data Masking

How to Safely Mask Table & Column Names Before Sending Queries to AI

Hide database schema from AI, anonymize identifiers, and restore AI output. Client-side, reversible masking—no data leaves your device.

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How to Mask JSON Payloads Before Sending Data to AI (Without Breaking Structure)

Anonymize API payloads and JSON for AI. Keys and string values masked; numbers unchanged. Preserve structure, restore exactly—client-side only.

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How to Use AI for MySQL Without Exposing Your Database Schema

Anonymize MySQL table and column names before ChatGPT or any AI. Reversible, client-side schema abstraction—compliance and security first.

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JSON Beautifier & Viewer — Format, Fix & Explore JSON Online

A JSON beautifier (also called a JSON formatter, JSON viewer, or JSON pretty-printer) adds indentation and line breaks to minified JSON, turning a compressed single-line string into readable, structured output. APIs and config files often deliver JSON without whitespace to save bytes — beautifying it is the first step in debugging any JSON payload.

Before (minified){"name":"Alice","roles":["admin","editor"],"active":true}
After (beautified){
"name": "Alice",
"roles": ["admin", "editor"],
"active": true
}

This tool goes beyond basic formatting: it validates syntax, highlights errors inline, auto-fixes common mistakes, explores structure via interactive tree view and JSONPath, and generates TypeScript interfaces or SQL INSERT statements from JSON — all without leaving your browser. Nothing is ever uploaded to a server.

💡

Press ⌘+Enter (Mac) or Ctrl+Enter (Windows) to format instantly — no mouse needed.

How it works

Format, Fix, and Explore JSON in Seconds

01

Paste or upload JSON

Type, paste, or drop a .json file. The tool accepts minified, pretty-printed, or partially broken JSON.

02

Beautify or minify

Click Beautify for indented output (2-space, 4-space, or tabs), or Minify for compact single-line JSON. Errors are highlighted inline.

03

Fix, explore, or transform

Auto-fix errors. Switch to Tree view to navigate. Run JSONPath queries. Generate TypeScript interfaces or SQL INSERTs.

04

Copy or download

One-click copy to clipboard or download as a .json file. Nothing sent to any server.

How we compare

JSON Beautifier vs Other Online JSON Tools

Most popular JSON formatters — jsonformatter.org, jsonbeautifier.org, curiousconcept.com — focus on basic formatting. Here is what makes this tool different:

100% client-side privacy — Your JSON never leaves your browser. Competitors process data on their servers, meaning your API responses, config files, and sensitive payloads are transmitted to a third party. This tool has no server — all processing happens locally with JavaScript.

Interactive tree view — Navigate deeply nested JSON structures by collapsing and expanding nodes, not just reading text. Most basic formatters only show pretty-printed text.

JSONPath query — Extract specific values from large JSON documents using standard JSONPath expressions (e.g. $.users[*].email). Run queries live as you type. Most formatters don’t support this.

TypeScript & SQL generation — Go from JSON to typed TypeScript interfaces or SQL INSERT statements in one click. No other free online JSON beautifier offers this combination.

Auto-fix — Automatically repair trailing commas, single quotes, and unquoted keys — common issues when pasting JSON from JavaScript code or log files.

Use cases

When Developers Use a JSON Beautifier

🐛

Debug API Responses

Paste a minified API response and instantly see its structure. Use tree view to navigate nested objects without eye strain.

🔧

Fix Invalid JSON

Auto-fix trailing commas, single quotes, unquoted keys, and other common JSON syntax errors with one click.

🌲

Explore Nested Data

Use tree view or JSONPath (e.g. $.users[*].email) to navigate and query deeply nested structures interactively.

📐

Generate TypeScript

Instantly generate TypeScript interface definitions from any JSON object to type API responses or data models.

🗄️

Generate SQL Inserts

Convert a JSON array of objects into SQL INSERT statements for seeding databases or testing.

🔒

Safe AI Debugging

Format JSON before pasting into ChatGPT or Claude. Use AI Schema Masker to strip sensitive fields before sharing.

JSON Syntax Quick Reference

TypeExampleCommon mistake
String"hello world"Single quotes are invalid JSON
Number42 / 3.14 / -1e10NaN and Infinity not allowed
Booleantrue / falseTrue / False (capital) are invalid
NullnullNull or NULL are invalid
Array["a", 1, true]Trailing comma after last element
Object{"key": "value"}Unquoted keys or single-quoted keys
Privacy

Your JSON Never Leaves Your Browser

Unlike most online JSON tools, this beautifier processes everything 100% client-side in your browser. There is no server receiving your data, no upload endpoint, and no logging. When you paste JSON containing API keys, user data, database credentials, or internal business logic, none of it is transmitted anywhere.

This matters for teams with data governance policies, regulated industries (healthcare, finance, legal), and anyone who takes security seriously. Use it freely with production data — the only system that sees your JSON is your own browser.

FAQ

Frequently Asked Questions

1What is the difference between JSON beautifier and JSON formatter?
They are exactly the same thing. Both terms describe pretty-printing JSON — adding indentation and line breaks to make it human-readable. "Beautifier", "formatter", "pretty-printer", and "viewer" are all used interchangeably for the same operation.
2What is a JSON tree view?
A JSON tree view displays your JSON as a collapsible hierarchy — objects and arrays you can expand and collapse with a click. It is much easier to navigate large or deeply nested JSON than reading formatted text.
3How do I fix trailing commas in JSON?
Click the Auto-Fix button. It automatically removes trailing commas after the last element in arrays and objects — one of the most common JSON errors when copying from JavaScript code.
4Can I generate TypeScript interfaces from JSON?
Yes. Paste any JSON object and switch to the TypeScript tab. The tool infers types and generates a complete, named TypeScript interface tree — useful for typing REST API responses.
5What is JSONPath?
JSONPath is a query language for JSON, similar to XPath for XML. For example, $.users[*].email extracts email from every user in the array. This tool runs JSONPath live as you type.
6How does this compare to jsonformatter.org or jsonbeautifier.org?
Those tools do basic formatting. This tool adds: interactive tree view, JSONPath queries, TypeScript generation, SQL export, auto-fix, and — the key differentiator — 100% client-side processing so your JSON never leaves your browser.
7Is my JSON safe to paste here?
Yes. Everything runs in your browser. Your JSON — even if it contains credentials or user data — is never uploaded or sent anywhere.
8Can I minify JSON here too?
Yes. Click Minify to compress your JSON to a single line with no whitespace — the format used in production APIs to minimise payload size.
9How do I convert JSON to a SQL INSERT statement?
Paste a JSON array of objects and switch to the SQL tab. Column names are inferred from the keys and INSERT statements are generated for every row — ready to paste into a database migration or seed script.
10How do I auto-fix JSON with trailing commas or single quotes?
Click Auto-Fix. The tool removes trailing commas, replaces single quotes with double quotes, adds missing quotes around unquoted keys, and repairs other common errors — turning invalid JSON into valid JSON without manual editing.
Learn more

Developer Guides

📖Top 10 JSON Errors📖Why JSON Breaks in Real APIs📖JSON Best Practices📖25 Broken JSON Examples & Fixes📖JSON.stringify vs JSON.parse📖Fix JSON Errors — Complete Guide

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