Free Online JSON Tools in Your Browser
This toolkit covers the data-wrangling jobs that come up when you are working with an API or a config file: formatting a minified response so you can read it, checking whether a payload is valid JSON before you ship it, comparing two versions to find what changed, and converting between JSON, YAML, CSV and XML.
Every tool here runs entirely in your browser. Your data is parsed by JavaScript on the page you are already looking at, so nothing is sent to a server. That matters when the payload is a production API response, a credentials file or anything else you would not paste into a stranger's website.
Why These JSON Tools
Your Data Never Leaves the Tab
Parsing and conversion happen in the page itself. There is no upload step and no server round trip, so a production payload stays on your machine.
No Account Needed
Open a tool and paste. No signup, no email confirmation, no API key and no quota to watch.
Precise Error Positions
When a document will not parse, the validator reports where it broke rather than only that it failed, which is usually the difference between a one-minute fix and a hunt.
Instant on Typical Payloads
Because there is no upload, the result appears as fast as your browser can parse the text. Very large documents are limited by your own machine, not by a queue.
Common JSON Tasks
These are the jobs most people come here for:
- Formatting a minified API response so the structure is readable before you debug it.
- Checking that a config file or payload is valid JSON, and finding the exact position of a syntax error.
- Comparing two versions of a response or config to see precisely which fields changed.
- Turning an API response into a CSV you can open in a spreadsheet, or the other way round.
- Converting between JSON and YAML when moving configuration between tools that expect different formats.
How to Use the JSON Tools
Every tool on this page follows the same three steps:
- Pick a tool. Choose the formatter, validator, diff, tree viewer or the converter you need from the cards above.
- Paste your data. Paste the JSON, YAML, CSV or XML straight into the input. Nothing is uploaded, so there is no wait.
- Copy the result. Read the formatted output, the validation message or the converted document, then copy it back out.
