Paste your data, pick a format, and convert instantly — no file upload, no sign-up, and nothing ever leaves your browser.
Whether you’re a developer moving data between a CSV export and a JSON API, a no-code builder turning a spreadsheet into something your app can read, or just trying to make sense of a messy data file, this page gives you one place to convert between the formats you actually work with: JSON, CSV, Excel, XML, YAML, SQL, and more. Pick what you’re starting with and what you need, and the tool below handles the rest.
[Interactive converter widget goes here — format dropdown, paste/upload box, live preview, download/copy button]
How it works
Every converter on this site runs entirely client-side, meaning the conversion happens inside your own browser using JavaScript — your data is never uploaded to a server, stored, or seen by anyone but you. This matters if you’re working with anything sensitive: customer records, internal configs, API keys embedded in test data, or anything else you wouldn’t want sitting on a third-party server, even briefly. Close the tab, and there’s no trace left anywhere but your own machine.
It also means there’s no file size cap tied to upload limits, and no waiting on a server round-trip — conversions happen instantly as you type or paste.
Explore every converter
Looking for something specific? Every tool below works the same way: paste or upload, convert, copy or download. Browse by category, or use the search box above to jump straight to what you need.
Tabular data (CSV, Excel)
- CSV to JSON Converter
- JSON to CSV Converter
- Excel to JSON Converter
- JSON to Excel Converter
- JSON to Excel Table Viewer
Markup & config formats (XML, YAML, HTML)
- XML to JSON Converter
- JSON to XML Converter
- YAML to JSON Converter
- JSON to YAML Converter
- JSON to HTML Table Generator
- HTML Table to JSON Converter
JSON to code (generate model classes)
- JSON to Dart / Flutter Model Generator
- JSON to TypeScript Interface Generator
- JSON Schema Generator
- JSON to Python Dataclass Converter
- JSON to PHP Array Converter
- JSON to Java POJO Generator
- JSON to C# Class Generator
- JSON to Kotlin Data Class Generator
- JSON to Swift Codable Generator
- JSON to Go Struct Generator
Databases & documents
- JSON to SQL INSERT Generator
- SQL to JSON Converter
- BSON to JSON Converter (MongoDB)
- PDF to JSON Extractor
- JSON to PDF Report Generator
- JSON to Markdown Table Generator
Developer utilities
- JSON Formatter & Validator
- JSON Beautifier
- JSON Minifier
- JSON String Escape / Unescape Tool
- JSON Diff / Compare Tool
- JSONPath Tester
- JQ Query Playground
- Base64 ⇄ JSON Converter
- Nested JSON Array Flattener
APIs, schemas & spreadsheets
- Avro Schema to JSON Converter
- Swagger / OpenAPI JSON ⇄ YAML Converter
- JSON to Postman Collection Converter
- Google Sheets ⇄ JSON Converter
(Note: link each item above to its live page as it launches. Items without a published page yet can be shown grayed out or simply omitted until ready — update this list weekly as new tools go live.)
Common ways people use this
Debugging an API response. You’ve got a raw JSON payload from an API and need it in a spreadsheet to actually look at it, or you need to generate a model class in your app’s language so you’re not hand-writing types.
Migrating data between systems. An old system exports CSV, a new one expects JSON — or vice versa. Rather than writing a one-off script, convert it here in seconds.
Building or documenting an API. Generate a JSON Schema from a sample payload, convert between Swagger/OpenAPI formats, or turn a JSON example into a ready-to-import Postman collection.
Working with config files. YAML and JSON show up interchangeably in DevOps tooling (Kubernetes, CI/CD configs, etc.) — convert between them without breaking indentation by hand.
Frequently asked questions
Is it safe to paste sensitive data into this tool? Yes — all conversion happens locally in your browser using JavaScript. Nothing is uploaded, transmitted, or stored on any server. You can verify this yourself by checking your browser’s network activity while using the tool.
Is there a file size limit? Because everything runs in your browser rather than on a server, the practical limit is your device’s available memory rather than an artificial cap — though very large files (tens of megabytes) may run slower depending on your browser and device.
Do I need to create an account? No. None of the tools on this site require sign-up, and there’s no usage limit.
What’s the difference between JSON and CSV? JSON is a structured, nested format that can represent complex relationships (objects within objects, arrays of objects); CSV is flat, row-and-column data best suited for simple tabular records. Converting from JSON to CSV works cleanly for flat data, but deeply nested JSON needs to be flattened first — see the Nested JSON Array Flattener tool above if you run into this.
Can I convert multiple files at once? Currently each tool handles one file or pasted block at a time. If batch conversion would be useful to you, let us know — [contact link].
Why are there so many separate tools instead of one universal converter? Each format pair has its own quirks (data types, nesting rules, escaping), so dedicated tools handle edge cases more reliably than a single generic converter. This hub page exists so you can find the right one quickly without bookmarking 40 different URLs.
Need a format combination you don’t see here? [Suggest a tool] — new converters are added regularly.