JSON Tools Online

Everything you need to work with JSON: format and explore it, find every error, compare two versions, and convert it to and from CSV, YAML, XML and TypeScript. Every tool runs in your browser, so the data you paste never leaves your device.

Open the JSON formatter Validate JSON

Format & View

Make JSON readable, explore it, or shrink it.

JSON Formatter & Beautifier new Beautify or minify JSON with exact error line and column, a tree view, sort keys and one-click repair. Opens files up to 50 MB, all in your browser. JSON Viewer new Explore JSON as a collapsible tree with search, type badges and child counts. Click any node to copy its JSONPath. Nothing is uploaded. JSON Minifier new Minify JSON by removing every optional space and line break, and see exactly how many bytes you saved. Runs locally, even on large files. JSON Escape & Unescape new Escape text or JSON into a JSON string literal, or unescape a stringified JSON value back into readable JSON.

Validate

Find every problem, or generate a schema that checks it.

JSON Validator new Validate JSON and list every problem with its line and column: trailing commas, missing commas, single quotes, comments and duplicate keys. JSON to Zod Paste any JSON object and infer a complete Zod validation schema with nested types, optionals, and arrays. No server round-trips — 100% in-browser. JSON Schema to Zod Convert JSON Schema definitions into type-safe Zod validation schemas. Supports nested objects, arrays, and complex constraints with zero data transmission.

Convert

Move data between JSON, spreadsheets, configs and types.

JSON to CSV Converter new Convert a JSON array to CSV or an Excel-ready file. Nested objects flatten into dot-path columns, with a live table preview. CSV to JSON Converter new Turn CSV or TSV into a JSON array. Detects the delimiter, uses the header row as keys, and infers numbers and booleans. JSON to YAML Converter new Convert JSON to clean, readable YAML for Kubernetes, Docker Compose and CI configs, with 2 or 4 space indentation. YAML to JSON Converter new Convert YAML to JSON with plain-English error messages that point to the line, including tabs and bad indentation. JSON to XML Converter new Convert JSON to well-formed XML with your own root element name, attributes from prefixed keys, and repeated elements for arrays. XML to JSON Converter new Convert XML to JSON with attributes kept under a prefix you choose. Validates the XML first and shows the line of any error. JSON to TypeScript new Paste a JSON response and get clean TypeScript interfaces or type aliases, with nested types named for you. Nothing is uploaded. JSON Schema to TypeScript Convert JSON Schema definitions into clean TypeScript interfaces. Handles objects, arrays, enums, and $ref. 100% client-side.

Compare

See what changed between two versions.

JSON Compare new Compare two JSON documents and list every added, removed and changed path. Key order is ignored, so only real changes show. Diff Viewer Compare code snippets, configuration files, or plain text side-by-side with syntax-highlighted inline and unified diffs. Nothing leaves your browser.

One engine, no uploads

All of these tools share the same JSON engine. It reports errors with the exact line and column, accepts JSON with comments when you ask it to, repairs the almost-JSON that LLMs and config files produce, and moves files over 1 MB to a background thread so the page never freezes. Files are read from your disk with the browser's FileReader, and the URL loader fetches straight from your browser to the address you type. Nothing passes through a SyntaxSnap server.

Most tools hand their result to the next one. Format an API response, send it to JSON to TypeScript or JSON to Zod, or turn it into a spreadsheet with JSON to CSV, without copying and pasting between tabs.