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Online JSON Converter

Convert and clean up JSON in your browser: format (pretty), minify, validate, turn JSON into CSV or a URL query string, and escape/unescape JSON string literals. Runs locally—no network requests.

Category: Developer · URL: /tools/online-json-converter.html
 
 
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Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Paste your JSON, pick an action, then copy the result.

  1. Paste JSON into the input box.
  2. Choose an action (Pretty, Minify, Validate, JSON→CSV, JSON→Query, Escape/Unescape).
  3. Optionally enable “Lenient parse” to remove comments and trailing commas.
  4. Click Convert, then Copy Output.
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Secondary intents covered: Pretty-print JSON for readability, Minify JSON for storage or transport, Validate JSON and pinpoint parse errors, Convert an array of objects JSON into CSV, Convert a flat JSON object into a URL query string, Escape JSON into a JSON string literal for embedding, Unescape a JSON string literal back into JSON, Fix common issues like comments or trailing commas before parsing, Copy converted output quickly for use in code

FAQ

Is this JSON converter private?

Yes. Everything runs in your browser and the tool does not send your input anywhere.

What’s the difference between Pretty and Minify?

Pretty adds indentation and line breaks for readability; Minify removes unnecessary whitespace to make JSON smaller.

What does “Lenient parse” do?

It tries to strip comments and trailing commas before parsing. If your input is already valid JSON, you can leave it off.

Can this convert any JSON to CSV?

It supports arrays of objects (one object per row). Nested objects/arrays are JSON-stringified inside cells.

How do Escape and Unescape work?

Escape outputs a JSON string literal (with backslashes) for embedding in code; Unescape reverses that and parses the embedded JSON.

Why am I getting a JSON parse error?

Common causes are trailing commas, comments, or using single quotes. Try enabling Lenient parse (and single-quote fix if applicable).

Does this preserve key order?

JSON objects are unordered by spec, but most engines keep insertion order; formatting uses the parsed object’s iteration order.