Messy JSON from logs
API logs and copied payloads often arrive on one line. Turn dense text into readable nested structure.
Free Developer Tool
JSON Formatter Format, Minify and Validate
Paste messy JSON, pretty-print it with readable indentation, compress it into one line, see syntax error location with repair suggestions, and keep data in your browser.
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JSON Formatter Problems This Tool Solves
A browser formatter is fastest when it catches real editing mistakes and keeps private payloads local.
Silent syntax mistakes
A missing comma, quote, or brace can block a request. Validate JSON and see error location, reason, and repair guidance.
Sensitive payloads
Tokens, internal IDs, and draft API responses should not be uploaded just to format JSON. Processing runs in your browser.
JSON Formatter Features for Daily Debugging
Format, minify, validate, inspect size, copy both JSON outputs, and download a .json file without switching tools.
Pretty JSON formatting
Choose 2 spaces, 4 spaces, or tabs so the output matches your codebase and review style.
JSON minify mode
Compress JSON into a single compact string for fixtures, config values, curl commands, or storage fields.
Error location and advice
Invalid JSON shows line and column when available, the parser reason, and a practical suggestion for the likely fix.
Copy formatted or minified JSON
Use separate buttons to copy the formatted JSON result or the compressed JSON result immediately after validation succeeds.
Download .json file
Save the current formatted or minified JSON output as a .json file for fixtures, bug reports, and documentation.
Private browser processing
The parser and serializer run locally with JSON.parse and JSON.stringify, so your pasted JSON stays on your device.
How to Use the JSON Formatter
The workflow is intentionally short: paste, choose output, fix errors, copy or download.
01
Paste JSON into the editor
Add a raw API response, config snippet, package metadata, or copied log payload to the input editor.
- Use the Sample button if you want to test the formatter before pasting your own data.
02
Choose Format or Minify
Format creates readable indentation. Minify removes whitespace so the output is compact for production use.
- Switch indentation between 2 spaces, 4 spaces, and tabs before copying formatted JSON.
03
Fix errors, then export
If validation reports invalid JSON, repair the shown issue, then copy formatted JSON, copy minified JSON, or download a .json file.
- The copy and download buttons stay disabled until the JSON is valid.
JSON Formatter Workflows
Use this page for debugging, cleanup, and safe handoff of structured data.
Pretty-print API responses
Paste a compressed API response and expand it into readable indentation for debugging nested fields.
Compress JSON for production
Switch to Minify when you need a compact JSON string for environment values, test fixtures, or request bodies.
Validate before sharing
Check syntax errors, location, reason, and likely repair before sending JSON to a teammate, support ticket, or deployment script.
JSON Formatter Use Cases
This page fits the small but constant JSON chores developers hit every day.
API debugging
Format responses from REST, GraphQL, webhooks, and browser network panels.
Config cleanup
Validate package snippets, app settings, localization files, and JSON fixtures before committing.
Support handoff
Minify or pretty-print JSON examples before sharing them in tickets, docs, or chat.
JSON Formatter FAQ
Common questions about formatting, compressing, validating, copying, and downloading JSON.
What does this JSON Formatter do?
It parses pasted JSON, reports syntax errors with location and suggestions, pretty-prints valid JSON, minifies JSON, copies either result, and downloads a .json file.
Does the JSON Formatter upload my JSON?
No. Processing runs in your browser with JSON.parse and JSON.stringify. Your pasted JSON is not sent to a server by this tool.
Can it fix broken JSON automatically?
Repair suggestions are shown, but invalid data is not rewritten automatically. Fix the reported issue, then format again.
What indentation can I use?
The JSON Formatter supports 2 spaces, 4 spaces, and tabs for pretty output. Minify mode removes unnecessary whitespace.
Start Using the JSON Formatter
Paste JSON, validate errors, format or compress it, copy either result, and download a .json file in seconds.
Free forever - browser-only JSON tool.