Data formats tools
Is it valid, where exactly is it wrong, and what does it become.
The answer that matters is which line and column is wrong and why, in words. These tools parse JSON, YAML, Avro and protobuf with their own linters rather than reporting whatever the runtime happened to say, because a JSON error message that changes between Node versions and never mentions a trailing comma is not good enough for a tool whose whole job is naming the broken line.
Free, with no sign-up. Every one runs entirely in your browser: nothing you paste is uploaded, and there is no server to send it to.
JSON Validator & Formatter
Valid? And where exactly is it wrong?
Validate and format JSON with the exact line and column of any error, named for what it actually is: trailing comma, single quotes, unquoted key, comment.
YAML Validator
The line, the column, and the reason
Validate any YAML and get the exact position of a syntax error in plain language.
YAML to JSON Converter
Either direction, and what it costs
Convert YAML to JSON or back, with the direction detected automatically and key order preserved.
jq Filter Tester
A filter is a stream, not a value
Run a jq filter against JSON in your browser. Verified against real jq, with anything outside the supported subset reported rather than ignored.