Format, minify, and validate JSON locally.
Clean up payloads, config files, and API responses without sending them to a server.
Workspace
Paste JSON and choose an action.
Output
Formatted JSON will appear here.
Tree view
root
name: "Dev Atlas"
tools
0: "json"
1: "jwt"
2: "timestamp"
localOnly: true
About this JSON formatter
Use this JSON formatter when you need to validate a payload, make minified API output readable, or compress formatted JSON before pasting it into another tool.
Common use cases
- Inspect API responses while debugging frontend or backend integrations.
- Validate configuration files before committing or sharing them.
- Minify JSON samples for docs, tickets, and test fixtures.
How to use this tool
- Paste JSON into the input editor.
- Choose Format, Minify, or Sort keys depending on the output you need.
- Check the status message for validation feedback, then copy the output.
Example
Input
{"name":"Dev Atlas","localOnly":true}Output
{
"name": "Dev Atlas",
"localOnly": true
}Common errors
- Trailing commas, comments, and unquoted keys are JavaScript object syntax, not valid JSON.
- Parser position errors usually mean a missing quote, comma, bracket, or brace near that character index.
- Empty input cannot be formatted because there is no JSON value to parse.
Privacy note
Dev Atlas keeps this tool local in your browser. Your input is not intentionally uploaded to a Dev Atlas server for processing.
FAQ
Does this JSON formatter upload my data?
No. Formatting, minifying, and validation run in your browser.
Can it fix invalid JSON automatically?
It reports parse errors, but it does not rewrite invalid JSON into a guessed valid form.
What JSON features are supported?
It uses the browser JSON parser, so it supports standard JSON syntax.