Create a JSON object for an e-commerce product with name, price, SKU, inventory...Try sample →
JSON Tools for AI Developers · Runs locally
Natural language generation · Schema · Zod · OpenAPI · Function Calling · MCP · 30+ tools
A JSON formatter grown into a toolkit for AI developers — click a tool name to open it in the Workbench
Natural language generation · Smart repair · Function Calling · MCP · NL Query
Format · Minify · Validate · Sort · Escape · Unicode · Clean
YAML · XML · TOML · CSV · Query string · Properties · Python Dict
JSON Diff · Structured Diff · Merge · JSONPath · Table
JSON Schema · Validate · Zod · OpenAPI · Structured Output · Mock
JSON → TS / Python / Go / Rust / Java · JWT
Three steps to start — pick a category and open a tool
Under the title, pick a tool by category: Basics, Convert, Analyze, or developer tools.
Paste JSON or matching text in the input, or click Load sample on the toolbar to try it. Format also supports Ctrl + Enterkeyboard shortcuts.
When you're done, click Copy result. Everything is processed in your browser and never uploaded.
Every tool ships with a sample. Click Try sample to load it into the Workbench
Create a JSON object for an e-commerce product with name, price, SKU, inventory...Try sample →
{
"name": "John",
"age": 25,
"email": "john@example.com"
}
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{
"id": 123,
"name": "John",
"active": true
}
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{
"name": "张三",
"age": 18,
"tags": ["json", "工具箱"]
}
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{
"name": "张三",
"tags": ["json", "yaml"]
}
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<user> <name>张三</name> <age>18</age> </user>Try sample →
A: { "age": 18 }
B: { "age": 20 }
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$.users[*].name → 提取所有用户名Try sample →
eyJhbGciOiJIUzI1NiIs... → Header + PayloadTry sample →
Search products by keyword and price range → OpenAI SchemaTry sample →
{
"skills": ["Python",
"JavaScript",
}
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{
"id": 0,
"title": "示例标题"
}
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For every other tool, click Load sample on that page's toolbar.
More than a formatter or validator — built for LLMs, Structured Output, and Agent work
All JSON processing happens locally. Nothing hits a server, so API keys and sensitive payloads stay safer.
Pure HTML + CSS + JavaScript. No npm install — open the page and start.
AI generate, Schema chain, Zod, OpenAPI, Function Calling, MCP, and more — the full AI-dev loop.
Generate OpenAI / Gemini / Claude / MCP Structured Output Schema in one click and get ahead on AI apps.
Switch themes for long JSON editing sessions. Your preference is saved locally.
Every tool can copy its output. Pair that with sample JSON and API debugging gets faster.
When developers reach for JSON Toolbox
The backend returned minified JSON. Paste it into the formatter and read nested fields and types fast.
Format →K8s and Docker Compose speak YAML; your app layer speaks JSON. Convert to move configs without rewriting them.
Convert →Compare two versions of an API response and spot added, removed, or changed fields.
Compare →Paste a Bearer Token, inspect the Header and Payload, and check expiry and permission claims.
Decode →Generate interface types from a sample API response so you write fewer types by hand.
Generate →Describe a data shape or API response. The AI generator returns valid JSON for prototypes and mocks.
Generate →Generate OpenAI / Claude / Gemini Structured Output Schema from a JSON sample.
Generate →Describe a tool in natural language and generate a Function Calling or MCP Tool Schema.
Generate →What people usually ask before they start
No. Every tool runs in your browser. Your JSON never leaves your device.
It depends on browser memory. A few MB usually feels smooth. For huge files, use a CLI tool.
Common syntax is covered. For deep nesting or unusual constructs, spot-check the important fields.
No. AI JSON generate, repair, and Function Calling use a local rules engine. Nothing is uploaded. You can later plug in OpenAI or similar APIs for extra power.
TypeScript, JavaScript, Python, Go, Rust, Java, Kotlin, Swift, C#, and PHP. Types are inferred from the JSON shape.
JSON → Schema → validate → Mock is the full loop. You can also convert to Zod, OpenAPI, or each platform's Structured Output Schema in one click.
Click a category chip on the home page or a tool page to open that standalone page. Tool names in the feature section jump there too.
Jump back to the top, pick a tool, paste your content, and start.
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