Miller columns for nested JSON
Browse parent, current, and child levels side by side.
JSON Viewer, Formatter, and InspectorBuilt for Deep JSON
jsonview.dev is a browser-based JSON workspace for viewing, formatting, repairing, converting, escaping, comparing, and inspecting JSON. Its Miller columns JSON Inspector keeps parent, current, and child context visible in deep payloads.
rootdatausers[0]addresscity
Miller columns for nested JSONdata
users
pagination
users [0]
id
name
email
active
address
roles
address
street
city
zipcode
geo
city
"Tokyo"
Built for Deeply Nested JSON
Miller columns show each level of a nested object or array in its own column, so parent, current, and child context stay visible while you move through complex JSON.
Path-aware inspection
See the exact path, type, and value of any selected field.
Built-in JSON tools
Format, repair, compare, convert, and escape JSON in one place.
JSON is defined by RFC 8259 and ECMA-404; jsonview.dev uses those standards as the reference point for JSON parsing, validation, and repair language.
FAQ
What is jsonview.dev?
jsonview.dev is a browser-based JSON workspace for inspecting deeply nested JSON, formatting and validating payloads, repairing malformed snippets, converting formats, escaping strings, and comparing documents.
What makes jsonview.dev different from a normal JSON viewer?
Most JSON viewers focus on tree views or pretty printing. jsonview.dev is inspector-first, with Miller columns, linked editor selection, path-aware navigation, and companion tools for repair, formatting, conversion, escaping, and diff work.
What are Miller columns in a JSON viewer?
Miller columns show each level of a nested object or array in its own column, so parent, current, and child context stay visible as you move through complex JSON.
Can I format and validate JSON online?
Yes. The JSON Formatter can beautify, minify, and validate JSON with inline parsing feedback.
Can jsonview.dev repair invalid JSON?
Yes. The JSON Repair tool can help fix common issues such as trailing commas, comments, single quotes, unquoted object keys, missing brackets, markdown code blocks, and extra prose around AI-generated JSON snippets.
Can I convert JSON to YAML, XML, CSV, or TOML?
Yes. The JSON Converter exports JSON into YAML, XML, CSV, and TOML in a live split workspace.
Can I compare two JSON files?
Yes. The JSON Diff tool compares two documents side by side, highlights changes, and can hide unchanged sections.
Can I escape and unescape JSON strings?
Yes. The Escape workspace converts raw text into JSON escaped strings and decodes escaped JSON string content back into readable text.
Does jsonview.dev support large JSON files?
Yes. jsonview.dev includes a large-file mode for cases where full structural rendering would be too heavy.