Format API responses during debugging
JSON Tool Collection
Online JSON Tools Hub
Format, minify, validate, convert, generate types and query JSON from one focused entry page.
A practical JSON toolkit for frontend, backend, QA and DevOps work: JSON formatter, minifier, viewer, diff, converters for YAML/XML/TOML/CSV/TypeScript/Go, JSON Schema generation and JSONPath extraction. Everything runs locally in your browser with no data uploaded.
16Curated tools
3Workflows
3FAQ answers
Built for these intents
Convert configuration data across JSON, YAML, TOML, XML and CSV
Generate TypeScript, Go or JSON Schema from sample JSON
Compare JSON documents and extract values with JSONPath
Tools in this hub
JSON Formatter
Beautify, minify and validate JSON data with syntax error detection. Supports JSON formatter, JSON beautify. Bidirectional, instant preview, one-click copy. Free at oltool.net.
JSON Minify
Compact JSON by stripping whitespace and newlines for smaller file size. Supports JSON minify, JSON compress. Bidirectional, instant preview, one-click copy. Free at oltool.net.
JSON Tree Viewer
Browse a JSON document as a collapsible tree with search and path copy. Supports JSON viewer, JSON tree. Built for developers, no signup, works offline. Free at oltool.net.
JSON Diff
Compare two JSON documents and highlight deep differences with inline view. Supports JSON diff, JSON compare. Bidirectional, instant preview, one-click copy. Free at oltool.net.
JSON to YAML
Convert JSON data to YAML format with custom indentation and nested objects. Supports JSON to YAML, JSON converter. Bidirectional, instant preview, copy. Free at oltool.net.
YAML to JSON
Convert YAML data to formatted JSON with nested structure support. Supports YAML to JSON, YAML converter. Bidirectional, instant preview, one-click copy. Free at oltool.net.
JSON to XML
Convert a JSON document to an XML document with custom root element and attributes. Supports JSON to XML, JSON XML. Bidirectional, one-click copy. Free at oltool.net.
XML to JSON
Convert an XML document to JSON via DOMParser with attribute and namespace support. Supports XML to JSON, XML JSON. Bidirectional, one-click copy. Free at oltool.net.
JSON to TOML
Convert JSON to TOML config format with nested tables, arrays and typed values. Supports JSON to TOML, TOML converter. Bidirectional, one-click copy. Free at oltool.net.
TOML to JSON
Parse a TOML document into JSON with tables, arrays, dates and multiline strings. Supports TOML to JSON, TOML parser. Bidirectional, one-click copy. Free at oltool.net.
JSON to CSV
Convert JSON array of objects to CSV with custom delimiters and headers. Supports JSON to CSV, JSON CSV. Bidirectional, instant preview, one-click copy. Free at oltool.net.
JSON to TypeScript
Generate TypeScript interfaces from sample JSON with nested types, arrays and optional fields. Supports JSON to TypeScript, JSON to interface. Runs locally — no data uploaded. Free at oltool.net.
JSON to JSON Schema
Generate a JSON Schema (Draft-07) from sample JSON with properties, required fields and array items. Supports JSON Schema generator. Runs locally — no data uploaded. Free at oltool.net.
JSON to Go Struct
Convert sample JSON to Go structs with json tags, nested types and omitempty option. Supports JSON to Go, golang struct generator. Runs locally — no data uploaded. Free at oltool.net.
JSONPath Finder
Test and extract data from JSON with JSONPath expressions in real time, with examples and match count. Supports JSONPath tester, jq-like query. Runs locally — no data uploaded. Free at oltool.net.
Data Format Converter
Convert between JSON, YAML, TOML, XML and CSV in one place with a single paste and instant preview. Supports data format converter, JSON YAML TOML XML CSV. Runs locally — no data uploaded. Free at oltool.net.
Suggested workflows
API debugging
Format a response, extract fields with JSONPath, then generate typed interfaces.
Config migration
Move data between JSON, YAML, TOML and XML for docs, services and deployment files.
Data handoff
Validate JSON, compact it for transport or convert arrays to CSV for spreadsheets.
Why this JSON hub exists
High-frequency developer entry
JSON appears in API debugging, config files, logs and data exchange, so a dedicated hub creates a stable workflow entry.
Less context switching
Formatting, conversion, type generation and schema checks often happen together; this page keeps the chain visible.
Local-first processing
Pasted responses, configs and test payloads stay in the browser instead of being sent to a server.
JSON tools FAQ
Do these JSON tools upload my data?
No. The tools run in your browser and your input is not uploaded to OLTool servers.
Can I process very large JSON files?
Large documents depend on browser memory and device performance. Format or minify first, then split when needed.
Can JSON to TypeScript output be used directly?
It is a strong starting point for API types; review optional fields and business-specific naming before committing.