JSON Tools
JSON is the default payload format for REST APIs, configuration files, logs and NoSQL documents. When a response arrives as one long line, or a config file refuses to load, you need to see its structure quickly and find the exact character that breaks it.
7 free tools
JSON Tools
7 tools shown
JSON Formatter
Format, validate and beautify JSON.
JSON Validator
Check JSON syntax and find errors.
JSON Minifier
Remove whitespace to shrink JSON.
JSON to CSV
Convert JSON arrays to CSV files.
JSON Diff
Compare two JSON documents.
JSON Schema Validator
Validate JSON against a JSON Schema.
JSON to YAML
Convert between JSON and YAML.
About these json tools
These tools cover the full JSON workflow: pretty-print a payload to read it, validate it to locate syntax errors by line and column, minify it before shipping, compare two versions to see what changed, check it against a JSON Schema contract, and convert it to CSV or YAML for spreadsheets and infrastructure files. Everything is parsed locally with your browser's native JSON engine.
Why use them
Exact error locations
Syntax errors are reported with a line and column so you can jump straight to the missing comma or stray quote.
Structural comparison
JSON Diff compares parsed values rather than raw text, so key order and whitespace changes don't create noise.
Contract checks
Validate payloads against JSON Schema drafts 4, 7, 2019-09 and 2020-12 before they reach production.
Frequently asked questions
What is the difference between formatting and validating JSON?
Formatting re-indents valid JSON so it is readable. Validation checks whether the text is syntactically valid JSON at all, and reports where parsing failed. The formatter validates as a side effect, while the dedicated validator also reports structure statistics and duplicate keys.
Do these tools support JSON with comments (JSONC) or trailing commas?
No. They follow the strict JSON specification (RFC 8259), which is what APIs and JSON.parse expect. Comments and trailing commas are reported as errors so you can remove them before the data reaches a strict parser.
How large a JSON document can I process?
Inputs up to a few megabytes are handled comfortably. To keep the page responsive on low-powered devices, each tool enforces an input size limit and tells you when it is exceeded.