100% client-side — your JSON never leaves your browser
Free online JSON tools, that respect your privacy
Compare, validate, beautify, format, and minify JSON — plus converters and code generators for CSV, Excel, YAML, XML, SQL, TypeScript, Python, and more.
- Total tools
- 30
- Free tools
- Server uploads
- 0
- Server uploads
- Offline support
- Yes
- Works offline
{
"name": "JSON Toolbox",
"private": true,
"uploadsToServer": 0
}JSON Tools
Format, validate, compare, and clean up JSON
10 tools
JSON Compare
Side-by-side semantic JSON diff by path.
Open toolJSON Validator
Catch invalid JSON with exact line and column.
Open toolJSON Beautifier
Pretty-print JSON with indent control and optional key sorting.
Open toolJSON Formatter
Format messy JSON with 2-space, 4-space, or tabs.
Open toolJSON Minifier
Strip whitespace.
Open toolJSON Stringify
Turn JSON into an escaped string literal ready for code or config.
Open toolJSON Unescape
Decode escaped JSON strings — or flip to escape mode.
Open toolJSON Escape
Escape quotes, backslashes, tabs, and newlines into valid JSON strings.
Open toolJSON Path Finder
Query JSON with JSONPath.
Open toolJSON Schema Validator
Validate JSON against a schema.
Open tool
Code Generators
Generate type definitions and classes from JSON
9 tools
JSON to TypeScript
Paste JSON.
Open toolJSON to Python
JSON in.
Open toolJSON to Java
Turn JSON into Java POJOs with typed fields and getters.
Open toolJSON to C#
JSON to typed C# classes with properties.
Open toolJSON to Go
JSON to Go structs with json tags.
Open toolJSON to Kotlin
JSON to Kotlin data classes with nullable-aware types.
Open toolJSON to Swift
JSON to Swift Codable structs.
Open toolJSON to Rust
JSON to Rust structs with serde derives.
Open toolJSON to PHP
JSON to PHP classes with typed properties and a constructor.
Open tool
Data Converters
Convert between JSON and other formats
11 tools
JSON to CSV
JSON array to CSV.
Open toolCSV to JSON
CSV to a JSON array of objects.
Open toolJSON to Excel
JSON array to Excel (.xlsx).
Open toolExcel to JSON
Excel (.xlsx/.xls) to a JSON array.
Open toolJSON to YAML
JSON to clean, readable YAML.
Open toolYAML to JSON
YAML 1.2 to JSON.
Open toolJSON to XML
JSON to XML with configurable indent.
Open toolXML to JSON
XML to JSON.
Open toolJSON to SQL
JSON array to SQL INSERT statements.
Open toolSQL to JSON
SQL INSERT statements to a JSON array.
Open toolJSON to Markdown
JSON array to a Markdown table.
Open tool
Built for developers who care about privacy
Fast, focused, and trustworthy — the way online developer tools should be.
Private by design
Every tool runs entirely in your browser. Your JSON is never uploaded, stored, or logged — safe for API keys, customer data, and internal payloads.
Instant results
Paste your JSON and get results immediately — no sign-up, no waiting on servers, even on large documents.
Works offline
Because nothing depends on a server, the tools keep working after the page loads — even with no internet connection.
One toolbox for every JSON task
A growing collection of privacy-first tools — from diffing and validation to conversion and code generation.
Learn moreJSON Toolbox is a growing collection of focused, privacy-first tools for working with JSON. Alongside the core utilities — a JSON compare tool, a JSON validator, and a JSON formatter — you can convert JSON to CSV, YAML, XML, and SQL, or generate TypeScript and other language types directly from a sample payload.
Unlike most online JSON tools, nothing here is sent to a server. Parsing, converting, and generating all happen locally in your browser, which makes every tool fast and safe to use with sensitive data.