AbstractPrisma
Developer Tools

JSON Validator & Converter

Validate, format and convert JSON to TypeScript, Zod and CSV/Excel instantly.

Input JSON
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What is JSON and how to validate it?

JSON (JavaScript Object Notation) is the most common format for exchanging data between systems and APIs. Valid JSON follows simple rules: keys in double quotes, values separated by commas, no trailing comma. This tool points to the exact error (line and column), formats the code, and even converts it to TypeScript types.

Most common JSON errors

  • Trailing comma before } or ]
  • Single quotes instead of double
  • Unquoted key
  • Comments (// or /* */) are not allowed in JSON

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How to validate and format JSON

  1. 1

    Paste your JSON

    Drop the content into the editor. Syntax errors are flagged with the offending line.

  2. 2

    Format or minify

    Use the buttons to pretty-print or minify the JSON in one click.

  3. 3

    Convert to TypeScript

    Generate TypeScript types, a Zod schema or CSV from the validated JSON.

Frequently asked questions

Is my JSON sent to a server?

No. All validation and conversion runs in your browser — your data never leaves your machine.

Which conversions are available?

You can convert JSON to TypeScript interfaces, Zod schemas and CSV right in the tool.

Is there a size limit?

There is no fixed limit, but very large files depend on your browser's memory to be processed.

Compare with alternatives

Validate and format JSON online — with privacy

Validate and format JSON directly in your browser. Processing is done locally: your code is not sent to any server, ideal for sensitive data or development debug. Besides validating syntax, you can format, minify, and convert to TypeScript or Zod for use in projects.

Why use this tool

  • Validate JSON online — detects syntax errors and points to the line
  • Format and minify JSON for readability or production
  • Local processing — nothing is sent to the server (full privacy)
  • Conversion to TypeScript (interfaces) and Zod (schemas)
  • Export to CSV for use in spreadsheets

How to use

  1. Paste the JSON in the input area or use the sample provided
  2. Click validate to check for errors; the message shows where to fix
  3. Use format to beautify or minify the result
  4. In the Conversions tab, choose TypeScript, Zod, or CSV and copy the result
  5. All processing happens on your device — data never leaves it

Frequently asked questions

Is my JSON sent to any server?
No. Validation, formatting, and conversions are done entirely in your browser. Your code and data stay on your computer, which is ideal for sensitive or confidential data.
What is converting JSON to TypeScript or Zod for?
TypeScript generates interfaces to type your code; Zod generates runtime validation schemas. Both help keep APIs and data consistent in front-end or Node.js projects.
Does the tool support JSON with comments?
Standard JSON does not allow comments. If your file has comments (e.g. JSONC), remove them before pasting here or use a preprocessor to strip them. The tool follows strict JSON specification.