JSON Formatter
Upload JSON File
Formatted JSON Text
Formatted JSON will appear here
About JSON Formatter
The JSON Formatter was created to help folks with debugging. As JSON data is often output without line breaks to save space, it can be extremely difficult to read and make sense of it. This JSON Formatter solves that by beautifying and validating your JSON so it is easier for humans to scan and debug.
To expand debugging capabilities, the JSON Formatter includes advanced validation following the description set out by Douglas Crockford of json.org in RFC 4627. It has since been updated to allow validation of multiple JSON standards, including current specifications RFC 8259 and ECMA-404.
The JSON Formatter can also fix common JSON errors. If enabled, it will replace incorrect quotes, add missing quotes, correct numeric keys, lowercase literals, escape unescaped characters, and remove comments and trailing commas.
Learn About JSON
JSON or JavaScript Object Notation is a language-independent open data format that uses human-readable text to express objects consisting of attribute–value pairs. Our JSON Formatter helps you explore and validate JSON faster in your browser.
Although originally derived from JavaScript, JSON data can be generated and parsed with many languages including JavaScript, PHP, Python, Ruby, and Java. A browser-based JSON Formatter is often the quickest way to inspect and pretty‑print JSON.
To learn more about JSON check out some of the following links.
FAQ
Can I pass my JSON data in the URL?
Yes. You can send data directly to the JSON Formatter and have it pre‑populate and process automatically. This is useful for sharing reproducible examples and linking from CI logs or documentation.
- dataJSON Data or a URL
- templatefourspace, threespace, twospace, compact, or onetab
- specrfc8259, rfc7159, rfc4627, ecma404, or skip
- fixtrue or false
- processtrue or false
Prefer POST for very large payloads. For GET links, keep in mind browser URL length limits and always URL‑encode your data. If the payload is sensitive, avoid placing it in the URL and instead paste it directly into the JSON Formatter.
Which JSON specification should I choose?
When in doubt, choose RFC 8259 in the JSON Formatter for the broadest compatibility across modern ecosystems. RFC 8259 refines earlier drafts and is effectively the interoperable standard.
ECMA‑404 defines the JSON data interchange format without prescribing all parsing details; use it when you need a very minimal check. Older RFCs (7159/4627) exist for legacy reasons. If you are inspecting third‑party payloads with mixed conventions, try RFC 8259 first, then loosen as needed.
Is any of my JSON data recorded or saved?
No. The JSON Formatter runs entirely in your browser; data stays on your device and does not get uploaded for processing. We do not store, index, or log your JSON content.
If you choose to share a link on social platforms, only the page URL is shared unless you explicitly include data via the query parameters. Avoid sharing confidential information and prefer pasting redacted samples into the JSON Formatter.
Is the JSON Formatter & Validator available offline?
We focus on providing the best online experience for the JSON Formatter and do not currently ship an offline installer. If you need offline formatting, consider using a local CLI such as jq or Node.js scripts for pretty‑printing and validation.
A common workflow is to validate large files locally, then use the JSON Formatter in the browser to quickly review smaller excerpts or to share examples with teammates.
Can I donate to the project?
Definitely. Community support helps us improve the JSON Formatter’s performance, keep the validator up to date with evolving specs, and add new quality‑of‑life features. Thank you for your generosity.
Does the JSON Formatter handle large files?
The JSON Formatter runs in your browser and can comfortably format typical files. Extremely large inputs may be constrained by available memory and the cost of rendering large trees.
Tips: load a smaller slice of the JSON for quick inspection, remove very large arrays you do not need to view, or preprocess with a CLI tool (e.g., jq) before pasting the relevant section into the JSON Formatter.
Can the JSON Formatter fix errors automatically?
Yes. When enabled, the JSON Formatter can fix common issues such as incorrect or curly quotes, missing quotes around keys, unescaped control characters, numeric key normalization, and trailing commas so your JSON validates against the selected specification.
Limits: automatic fixes target syntax problems; they do not infer domain semantics. Review the output and re‑validate against RFC 8259 in the JSON Formatter before using the data in production.
How do I copy or share results from the JSON Formatter?
Use Copy to Clipboard in the Formatted JSON panel to copy the prettified output. For sharing, open Share and choose a platform; the JSON Formatter prepares a clean, shareable link that you can paste anywhere.
For privacy, verify that the link does not embed sensitive content. If needed, remove query parameters and ask recipients to paste their own data into the JSON Formatter.
Is the JSON Formatter free to use?
Yes. The JSON Formatter is free for personal and educational use. You can format, validate, and share JSON as often as you need. Attribution is appreciated when you link to the tool in articles or tutorials.