JSON
Format, inspect, and query JSON with configurable indentation, key sorting, validation, and JSONPath selection.
Open JSONDeveloper tool category
JSON & Data Tools
Use this collection when a payload needs to be inspected, validated, repaired, compared, or converted between common developer data formats. Start with the source format, confirm the structure is valid, then move to the transformation or export step you actually need.
Common workflow
Where to start
4 recommended starting points
JSON Validator
Check JSON syntax, locate errors, and format valid data without uploading it.
Open JSON ValidatorJSON Repair
Repair common JSON syntax problems locally, review every change, and compare the fixed output before you use it.
Open JSON RepairJSON to CSV
Convert JSON objects and arrays to CSV, flatten nested fields, and download the result locally.
Open JSON to CSVPrimary utilities
Core tools
9 core tools
JSON Formatter Online – Format & Beautify JSON
Format, inspect, and query JSON with configurable indentation, key sorting, validation, and JSONPath selection.
YAML Tools Online – Format, Validate & Convert YAML
Format, validate, and convert YAML and JSON locally with YAML 1.2 parsing.
XML Tools Online – Format, Validate & Convert XML
Format and validate XML, convert XML to JSON, or create XML from JSON entirely in your browser.
CSV Tools Online – Format, Validate & Convert CSV
Format and validate CSV, convert CSV to JSON, or turn JSON into spreadsheet-ready CSV locally.
JSON to CSV Converter Online
Convert JSON objects and arrays to CSV, flatten nested fields, and download the result locally.
JSON Diff Online – Compare JSON Files
Compare two JSON documents and review added, removed, and changed paths.
JSONL Formatter & Validator Online
Validate newline-delimited JSON, preview it as an array, normalize one record per line, or convert a JSON array to JSONL.
Query String Parser & Builder Online
Parse query parameters into JSON, build encoded query strings, clean and sort parameters in one pass, or run focused sorting and cleanup operations.
SQL Formatter & Minifier Online
Expand dense queries into readable SQL with selectable dialect and keyword casing, or compress them again.
Task-specific entry points
Focused tasks
23 focused pages
JSON
JSON tasks
Format, inspect, and query JSON with configurable indentation, key sorting, validation, and JSONPath selection.
JSON Repair Online – Fix Invalid JSON
Repair common JSON syntax problems locally, review every change, and compare the fixed output before you use it.
JSON Schema Generator Online – Generate Schema from JSON
Generate and configure a reviewable JSON Schema from one value or multiple representative samples, including optional-field and type merging.
JSON Schema Validator Online – Validate JSON Data
Validate JSON data against a reviewable schema subset and locate contract failures without uploading either document.
JSON to TypeScript Online – Generate Interfaces from JSON
Generate exported TypeScript interfaces and type aliases from one valid JSON sample without uploading it.
JSON to Go Struct Converter Online
Generate reviewable Go struct declarations from one valid JSON sample, including nested objects, arrays, and JSON field tags.
JSON Validator Online – Check JSON Syntax
Check JSON syntax, locate errors, and format valid data without uploading it.
JSON Minifier Online – Compress JSON
Remove unnecessary whitespace and line breaks from valid JSON without uploading it.
JSON Tree Viewer Online – Explore JSON Data
Browse nested JSON objects and arrays, expand branches, and search keys or string values without uploading data.
JSON Error Checker Online – Find Syntax Errors
Find JSON syntax errors with line, column, character position, and nearby context without uploading data.
JSON Sort Keys Online – Alphabetize JSON
Sort JSON object keys alphabetically at every level while preserving values and array order.
JSON File Viewer Online – Open JSON Files
Open a local JSON file, validate its contents, and view formatted data without uploading it.
JSON Unescape Online – Decode Escaped JSON
Decode escaped JSON strings and backslash sequences into readable text or formatted JSON without uploading data.
YAML
YAML tasks
Format, validate, and convert YAML and JSON locally with YAML 1.2 parsing.
YAML Formatter Online – Format & Beautify YAML
Format YAML configuration into readable, consistently indented output without uploading it.
YAML Validator Online – Check YAML Syntax
Check YAML syntax with a real parser and readable error feedback without uploading configuration data.
YAML to JSON Converter Online
Parse YAML and convert its data model to two-space JSON locally in your browser.
JSON to YAML Converter Online
Parse JSON and serialize the same values as readable YAML without sending the document to a backend.
XML
XML tasks
Format and validate XML, convert XML to JSON, or create XML from JSON entirely in your browser.
XML Formatter Online – Format & Beautify XML
Parse compact XML and rewrite it with readable indentation without sending the document to a backend.
XML Validator Online – Check XML Syntax
Check whether XML is well-formed with browser parser feedback without uploading the document.
XML to JSON Converter Online
Parse XML and map its element structure into readable JSON with explicit attribute and text keys.
JSON to XML Converter Online
Parse JSON and create readable XML with deterministic element, array, attribute, and text mapping rules.
CSV
CSV tasks
Format and validate CSV, convert CSV to JSON, or turn JSON into spreadsheet-ready CSV locally.
CSV Formatter Online – Clean Up CSV
Normalize CSV quoting and record line endings while keeping table values intact.
CSV Validator Online – Check CSV Syntax
Check CSV quoting, delimiter structure, and consistent record widths in your browser.
CSV to JSON Converter Online
Convert a delimited table into an array of JSON objects using its header row as keys.
Diagnose specific failures
Troubleshooting
5 topic hubs
JSON troubleshooting
Diagnose JSON parser errors, malformed payloads, escaping mistakes, truncated responses, and JavaScript values that are not valid JSON.
YAML troubleshooting
Trace YAML indentation, mapping, sequence, quoting, directive, anchor, alias, and flow-style errors with parser-focused examples.
XML troubleshooting
Find XML well-formedness problems involving tags, attributes, entities, namespaces, declarations, CDATA, comments, and root structure.
CSV troubleshooting
Debug CSV delimiter, quoting, header, row-width, empty-cell, multiline-field, and type-preservation issues before importing tabular data.
Query String troubleshooting
Resolve query-string parsing and building errors involving percent encoding, repeated parameters, empty values, fragments, arrays, and JSON inputs.
Understand the concepts
Related guides
9 guides
How to Fix Invalid JSON Errors
Learn how to find and fix missing commas, unquoted keys, trailing commas, invalid escapes, hidden characters, and other common JSON errors.
JSON vs JSONL: Differences and Examples
Compare JSON and JSONL structure, examples, streaming behavior, error handling, and the situations where each format is the better choice.
Unix Timestamp Seconds vs Milliseconds
Learn how to identify 10-digit and 13-digit Unix timestamps, convert between seconds and milliseconds, and avoid timezone mistakes.
JSON Escaping Explained: Quotes, Backslashes, Newlines & Unicode
Learn how JSON escaping works for quotes, backslashes, control characters, newlines, Unicode escapes, and double-encoded JSON with practical examples.
YAML Indentation Explained: Spaces, Sequences & Mapping Errors
Learn how YAML indentation defines mappings, sequences, nested blocks, and multiline scalars, with examples for tabs, spacing, and common parser errors.
XML Parsing and Validation Errors Explained
Understand XML parsing and well-formedness errors, how to read parser messages, and how tags, entities, attributes, namespaces, and document structure cause validation failures.
CSV Quoting, Delimiters, and Column Rules Explained
Understand CSV quoting, comma, semicolon, and tab delimiters, consistent column counts, header rules, multiline fields, and safe CSV-to-JSON conversion.
Query String Encoding and Repeated Parameters Explained
Understand query string percent encoding, plus signs, repeated parameters, empty values, fragments, and how JSON arrays map to repeated query keys.
SQL Formatting vs Validation: What a Formatter Can and Cannot Check
Learn the difference between formatting SQL and validating it, including dialect syntax, schema checks, execution errors, query safety, and a practical review workflow.