JSON Converter Online — XML, CSV, YAML, TOML & Code

JSONLab JSON Converter is a free, browser-based JSON converter online for developers, analysts and anyone working with structured data. It converts JSON to or from YAML, XML, CSV and TOML, generates typed source-code models, and queries large documents without sending their contents to an application server. Paste text directly or select a supported local file, choose the direction, and copy the converted result when it is ready.

Convert JSON, XML, CSV, YAML and TOML both ways

The converter works in both directions. Use the XML to JSON converter to turn elements and attributes into a JSON structure, or send JSON back to XML for systems that require markup. The CSV to JSON converter maps a header row to object keys, making tabular exports easier to use in APIs. The YAML to JSON converter handles configuration data, while TOML support is useful for application and package settings. You can also reverse each workflow to create YAML, XML, CSV or TOML from valid JSON.

How to use this JSON converter online

  1. Select YAML, XML, CSV or TOML from the format controls.
  2. Use the direction button to choose JSON as the source or destination.
  3. Paste content into the source pane or upload a matching local file.
  4. Review the automatic result, then copy it or load JSON into the editor.

A conversion error leaves the source unchanged and, when possible, points to the affected line or data path. That makes it easier to correct a malformed document without losing the original input. For formatting and syntax repair before conversion, open the JSON Viewer and Validator.

Generate typed code and query JSON data

Converter mode is only one part of the page. Code mode examines a sample JSON document and generates TypeScript interfaces, Java classes, Go structs, Python dataclasses or Dart classes. Query mode evaluates JSONPath or JMESPath expressions and returns the matching data as formatted JSON. These options help when moving from an API example to an application model, or when you need to extract a small result from a much larger payload before converting it.

Text, TXT and string to JSON conversion

JSON itself is text, but unstructured prose cannot be converted reliably until you decide which words should become keys and values. A string to JSON converter can parse a string only when it already contains valid JSON syntax. Likewise, a generic text to JSON converter or TXT to JSON converter needs rules for the source format. If a text file contains CSV, YAML, XML, TOML or JSON, choose that real format here. Otherwise, organize the text into a schema first and then validate the resulting JSON.

PDF, Excel and Word conversion options

JSONLab does not claim to be a direct PDF to JSON converter, because PDF pages require table extraction, OCR and field-mapping rules. Extract the structured content first, then bring CSV or JSON into this tool. For an Excel to JSON converter workflow, save the worksheet as CSV and convert that CSV to JSON. In the other direction, a practical JSON converter to Excel workflow is JSON to CSV followed by opening the CSV in Excel; native XLSX files are not generated. A JSON converter to Word is also not included, since Word output requires a document template and layout rather than only a data transformation.

Private conversion in your browser

Supported conversions and queries run locally, and uploaded files are read by browser APIs. This keeps API responses, configuration values and test data away from an application server. Smaller shared JSON documents may remain in session storage so you can move between JSONLab tools; clear the editor or close the browser session when you are finished. No account is required, and the converter is free to use.

Frequently asked questions about the JSON converter

How to use a JSON converter in C#?

In C#, use System.Text.Json: call JsonSerializer.Deserialize<T>(json) to turn JSON into a typed object and JsonSerializer.Serialize(value) to create JSON. JSONLab can prepare or inspect the JSON and convert it to XML, CSV, YAML or TOML, but its code generator currently targets TypeScript, Java, Go, Python and Dart rather than C#.

How to open a .JSON file online?

Open JSONLab, select the Converter, and use Upload to choose a local .json file, or paste its contents into the source editor. To inspect and format the file instead of converting it, use the JSON Viewer. The file is read locally by your browser rather than uploaded to an application server.

How do I convert to JSON?

Choose YAML, XML, CSV or TOML, switch the direction so the selected format points to JSON, then paste or upload the source file. The converter updates the JSON output automatically. Copy the result or select Load into editor to continue validating, formatting or using it in another JSONLab tool.

Can I convert JSON to text?

JSON is already a plain-text data format. You can copy formatted JSON and save it as a .txt file, or convert it to another text-based format such as YAML, XML, CSV or TOML. JSONLab does not have a separate generic TXT target because unstructured text needs a defined schema before it can become structured JSON.

What is the best way to open a JSON?

Use a dedicated JSON viewer when you need to read the structure, search values and validate syntax. JSONLab’s JSON Viewer and Formatter displays a collapsible tree and catches errors. Use this Converter when your goal is to change the document into another data format or generate typed source code.

How to convert JSON to human-readable?

Open the JSON Viewer, paste or upload the document, and format it with indentation. A formatted tree is usually the clearest human-readable representation. You can also use this converter to create YAML, which is often easier to scan for configuration data, while preserving the original hierarchy.

Which formats does the JSON converter support?

The Convert mode supports JSON to and from YAML, XML, CSV and TOML. Code mode generates TypeScript, Java, Go, Python and Dart models. Query mode supports JSONPath and JMESPath. PDF, DOCX, native Excel files and arbitrary TXT documents are not direct input or output formats.

How does the XML to JSON converter work?

Select XML, switch the direction to XML → JSON, then paste XML or upload a local .xml file. Valid elements, attributes and text are transformed into JSON and conversion errors include location details when available. Review the output before using it because XML and JSON represent repeated elements and attributes differently.

Can I convert CSV or YAML to JSON online?

Yes. Select CSV or YAML, switch the arrow toward JSON, and paste or upload the source. The CSV to JSON converter uses the header row as object keys, while the YAML to JSON converter preserves supported mappings, lists and scalar values. You can copy the generated JSON or load it into the shared editor.

Does JSONLab convert PDF files to JSON?

No. A PDF stores page layout rather than a consistent data schema, so JSONLab is not a direct PDF to JSON converter. First extract the PDF’s tables or fields with an OCR or document-processing tool, export that structured result as CSV or JSON, and then use JSONLab to validate or convert it.

Can I convert JSON to Excel or Word?

JSONLab does not create native .xlsx or .docx files. For Excel, convert a flat JSON array to CSV and open the CSV in Excel. There is no direct JSON converter to Word because a Word document requires layout and document-template decisions that are not present in JSON.

Is my data private when I use the online converter?

Conversion, code generation and queries run in your browser, and source files are read with the browser FileReader API. JSONLab does not send the document to an application server. The shared JSON editor may retain smaller documents in session storage for continuity between tools; clear the editor or close the session when finished with sensitive data.