Free browser-based developer tools
Convert, Validate and Format Data Instantly
Work with JSON, CSV, XML, YAML, SQL and code models directly in your browser. No upload, no account and no waiting.
82 tools · browse them all · open the JSON workspace
Pick where to start
Four categories cover every tool on the site. Validators and formatters cut across them, so those two groups overlap the others rather than adding to them.
- 20 toolsJSON ToolsFormat, repair, inspect and compare JSON.Featured toolJSON Formatter
- 25 toolsConvertersConvert between JSON, CSV, XML, YAML and SQL.Featured toolJSON to CSV
- 9 toolsValidatorsFind syntax, structure and schema errors.Featured toolJSON Validator
- 11 toolsFormattersBeautify and normalise code and structured data.Featured toolJSON Beautifier
- 13 toolsCode GeneratorsTurn JSON samples into typed language models.Featured toolJSON to TypeScript
- 24 toolsDeveloper ToolsEncode, decode, compare and inspect developer data.Featured toolText Diff
How Convert2JSON works
- Runs in Your BrowserParsing, conversion and code generation happen on this device.
- No UploadsWhat you paste and what comes out never reach a server.
- Works OfflineOnce a tool page has loaded, it keeps working with no connection.
- Keyboard FriendlyRun with Ctrl/Cmd + Enter, copy the result without reaching for a mouse.
Developer tools for every data format
Choose a category or search by format, language or task.
Showing 12 of 82 tools
- JSON FormatterJSON ToolsPretty-print messy JSON with your choice of indentation and optional key sorting.JSONJSON
- JSON ValidatorJSON ToolsCheck JSON syntax and get the exact line, column and cause of every failure.JSONReport
- JSON MinifierJSON ToolsStrip whitespace from JSON and see exactly how many bytes you saved.JSONJSON
- JSON ViewerJSON ToolsBrowse JSON as a collapsible tree, search keys and values, and copy JSONPath.JSONTree
- JSON EditorJSON ToolsEdit JSON with line numbers, syntax highlighting and live error markers.JSONJSON
- JSON CompareJSON ToolsDiff two JSON documents structurally and list every added, removed or changed value.JSONDiff
- JSON Path FinderJSON ToolsSearch a JSON document for keys or values and get the JSONPath of every match.JSONJSONPath
- JSON FlattenerJSON ToolsCollapse nested JSON into one level of path keys, or rebuild it again.JSONJSON
- JSON BeautifierJSON ToolsExpand minified JSON into clean, indented, readable output.JSONJSON
- JSON ParserJSON ToolsParse JSON, confirm it is valid, and see it as clean indented output.JSONJSON
- JSON SorterJSON ToolsAlphabetise every object key recursively for stable, comparable JSON.JSONJSON
- JSON to One LineJSON ToolsCollapse a multi-line JSON document onto a single compact line.JSONJSON
One editor for the whole job
Open the workspace →Paste a document once, then switch between format, validate, repair, minify, sort, query, diff, schema, convert and code generation without navigating away or pasting again.
Code view
Highlighting, line numbers, bracket matching, folding, find and replace, undo, and the error line marked where the parser stopped.
Tree view
Collapsible nodes with type, array length and key count. Search steps between matches; copy any node’s path, value or whole subtree.
Table view
An array of objects as sortable, filterable rows with hideable columns, paging and CSV or TSV export.
Browse by format
Start from the file you already have.
Browse by task
Start from what you need to do.
Format and clean
Make an unreadable document readable, or strip it back down for transport.
Validate and repair
Find out why it will not parse, then fix it.
Convert formats
Move the same data between JSON, CSV, XML, YAML and SQL.
Explore and query
Navigate a large document and pull out the parts you need.
Generate code
Turn a captured response into typed models.
Encode and decode
Base64, URL, HTML entities, JWTs and JSON string escaping.
All 82 tools by category
Format, validate, compare and explore JSON documents without leaving the browser tab.
- JSON FormatterPretty-print messy JSON with your choice of indentation and optional key sorting.
- JSON ValidatorCheck JSON syntax and get the exact line, column and cause of every failure.
- JSON MinifierStrip whitespace from JSON and see exactly how many bytes you saved.
- JSON ViewerBrowse JSON as a collapsible tree, search keys and values, and copy JSONPath.
- JSON EditorEdit JSON with line numbers, syntax highlighting and live error markers.
- JSON CompareDiff two JSON documents structurally and list every added, removed or changed value.
Move data between JSON, XML, YAML, CSV, TSV, HTML tables and query strings with the options each format actually needs.
- JSON to Base64Encode a JSON document as Base64 for transport in tokens, URLs or headers.
- Base64 to JSONDecode a Base64 string and format the JSON it contains.
- JSON to SQLGenerate INSERT statements from a JSON array of objects.
- SQL to JSONParse INSERT statements into a JSON array of row objects.
- JSON to XMLTurn JSON objects and arrays into well-formed XML with a configurable root element.
- XML to JSONParse XML into JSON with configurable attribute, text-node and array handling.
Turn a JSON sample into typed models for thirteen languages, with the annotations and naming conventions each ecosystem expects.
- JSON to TypeScriptGenerate TypeScript interfaces, types or classes from a JSON sample.
- JSON to JavaScriptGenerate JavaScript classes or JSDoc typedefs from JSON data.
- JSON to PythonGenerate dataclasses, TypedDicts or Pydantic models from JSON.
- JSON to JavaGenerate Java POJOs or records with Jackson, Gson or Lombok annotations.
- JSON to C#Generate C# classes or records with System.Text.Json or Newtonsoft attributes.
- JSON to GoGenerate Go structs with json tags, omitempty and pointer options.
Encoding, hashing, time, colour, regex and formatting utilities that come up in everyday work.
- Base64 EncodeEncode text or files to Base64, with URL-safe and line-wrap options.
- Base64 DecodeDecode Base64 back to text, with automatic URL-safe and padding handling.
- URL EncodePercent-encode text for safe use in URLs, with component and full-URL modes.
- URL DecodeDecode percent-encoded URLs and parameters back to readable text.
- HTML EncodeEscape HTML special characters so markup and code display as text.
- HTML DecodeConvert HTML entities back into the characters they represent.
Your data stays in your browser
- No upload step — conversions run in JavaScript in this tab.
- No account, and nothing to sign in to.
- Files you open are read by the browser, not sent anywhere.
- What you paste is gone when the tab closes.
- Analytics events carry tool names and size buckets, never content.
- You can confirm all of it: open the network panel and run a conversion.
The one exception is the workspace’s “From URL” button, which fetches the address you type — that request goes from your browser to that server. Full detail in the privacy policy.
Why use Convert2JSON
Processed in your browser
Parsing, conversion and code generation all run in JavaScript on your own device. There is no upload step, so a payload from a private staging environment never leaves your machine.
No account, no limits
Nothing is gated behind a sign-up form, a trial, or a daily quota. Open a tool, paste, convert, close the tab.
Fast on real payloads
Documents up to a few megabytes convert in milliseconds. Larger inputs are handed to a background worker so the page stays responsive and the conversion can be cancelled.
Errors you can act on
A failed parse reports the line, the column, the surrounding text and the most likely cause — not a character offset you have to count to by hand.
Works on a phone
The two-pane layout stacks vertically on small screens, controls meet touch target sizes, and every tool is reachable without a mouse.
Keyboard first
Ctrl or Cmd + Enter runs the conversion, Ctrl or Cmd + Shift + C copies the result, and every control is reachable by tab with a visible focus ring.
Frequently asked questions
Is convert2json really free?
Yes. Every tool is available without an account, a trial or a usage limit. The site is funded by advertising, which is why you may see ad placeholders in the layout, and no feature is held back behind a paywall.
Does my data get uploaded to a server?
No. All parsing, conversion and code generation happen in JavaScript inside your browser tab. There is no backend that receives your content, which you can verify by watching the network panel while you convert, or by disconnecting from the internet after the page loads.
How large a file can I convert?
File uploads are capped at 25 MB, and in practice the real limit is your browser memory rather than a fixed number. Documents up to a few megabytes convert almost instantly; beyond that the work moves to a background worker so the page stays usable and you can cancel it.
Do the tools work offline?
Once a tool page has loaded, yes. The conversion logic is already in your browser, so it keeps working if you lose your connection. Navigating to a page you have not visited yet still requires the network.
Why are there so many code generators?
Because every language expresses the same JSON shape differently — Go needs struct tags, Swift needs CodingKeys, Rust needs serde attributes, Java needs a serialisation annotation per field. A generic generator would produce code you then have to rewrite, so each language gets its own emitter with its own options.
Can I use the generated code commercially?
Yes. Output generated from your own data is yours, with no attribution requirement and no licence attached by us.
Do you store anything in my browser?
Only your light or dark theme preference, in localStorage. Documents you paste are held in memory for the life of the page and are gone when you close the tab.
Newer to JSON, or debugging a specific error? The guides explain the format, the errors and the conversions in more depth, and the examples are copy-paste ready.