About JSON Formatter
What Does a JSON Formatter Do?
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 and Parse both rebuild the value from parsed data so the output is clean, valid JSON. 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 compare different JSON payloads side by side. Your tabs auto-save to the browser, so they'll still be there when you come back. If you need to compare two JSON objects structurally, try our JSON Diff tool instead.
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.