JSON Formatter & Converter
Compare two JSON documents
About JSON Formatter & Converter
Format, validate, and convert JSON in one workspace
JSON (JavaScript Object Notation) is everywhere — API responses, config files, database exports, package manifests. But raw JSON from an API or a minified file is nearly impossible to read. A formatter takes that dense blob of text and adds proper indentation and line breaks so you can actually see the structure.
This tool parses your JSON, checks that it's valid, and outputs standard prettified JSON (indentation and quoted keys). Format rebuilds the value into clean JSON; Sort keys makes large payloads easier to compare. If something's wrong — a missing comma, an extra bracket, an unquoted key — you'll get a clear error pointing to the problem.
When You'd Use This
- Debugging API responses — Paste the raw response and see nested objects clearly
- Editing config files — Format
package.json,tsconfig.json, or any config before making changes - Validating data — Quickly check if a JSON string is well-formed before sending it somewhere
- Minifying for production — Strip whitespace to reduce payload size
Tips
Use multiple tabs to keep different payloads available. Your tabs auto-save to the browser, so they'll still be there when you come back. Use Compare JSON when you need to inspect structural differences between two payloads.
Frequently asked questions
Is this JSON formatter safe to use with sensitive data?
Yes. Everything runs locally in your browser — your JSON is never uploaded to any server, so you can safely paste API responses or config files.
What's the difference between Format and Minify?
Format adds indentation and line breaks so JSON is easy to read, while Minify strips all whitespace to produce the smallest valid JSON for production.
Why does it say my JSON is invalid?
The parser reports the first syntax error it finds — usually a missing comma, an extra trailing comma, unquoted keys, or single quotes instead of double quotes.
Can I convert JSON to CSV, JavaScript, or TypeScript?
Yes. Open Convert above the workspace. JSON to CSV accepts one object or an array of objects; JavaScript and TypeScript exports are useful for fixtures, constants, and typed API models.
How do I rename a tab?
Click the active tab name, enter its new name, and press OK. Your tabs are saved locally in your browser.