01
Nested structure restored
Turn explicit paths back into objects and contiguous arrays with original scalar types.
Start typing to search 227 tools.
AI Token Cost CalculatorCalculatorCalculate estimated LLM input and output cost for one request or a batch using editable prices per million tokens and manual or text-estimated usage.→AI Token CounterDeveloperEstimate AI prompt tokens with a transparent English, code, or multilingual heuristic, including a planning range, characters, UTF-8 bytes, words, and detected content profile.→API Key GeneratorGeneratorGenerate secure API keys with configurable length, prefix, quantity, and URL-safe, hexadecimal, Base32, or alphanumeric formats.→Alternating Case ConverterTextConvert ordinary text into alternating uppercase and lowercase letters while preserving spaces, punctuation, numbers, and line breaks.→Article Schema GeneratorSeoGenerate Article JSON-LD with headline, author, publisher, dates, image, and canonical URL.→BCrypt Hash GeneratorGeneratorGenerate a salted 60-character BCrypt password hash, choose cost 4–15, inspect its parts, measure runtime, and verify it immediately.→BCrypt 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DecoderEncode DecodeDecode one X.509 PEM certificate and inspect subject, issuer, validity, SAN entries, fingerprints, serial number, signature, and key usage.→Character CounterTextMeasure characters with and without spaces, plus words and lines, for social posts, forms, metadata, and editing→Checksum CalculatorEncode DecodeCalculate CRC32, MD5, SHA-1, SHA-256, SHA-384, or SHA-512 checksums from exact text and compare deterministic outputs across systems.→Collapse SpacesTextCollapse repeated horizontal spaces into one space while preserving line breaks, paragraph structure, and the order of your text.→Comma List to LinesTextConvert comma-separated values into one trimmed item per line, omit empty entries, and prepare a clean vertical list for spreadsheets or imports.→Content-Type ParserDeveloperParse a Content-Type header into its media type, charset, boundary, and other parameters.→Cookie ParserDeveloperParse a Cookie request header into readable cookie names and values.→Cron 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security headers for a public URL.→HTTP Request BuilderGeneratorBuild a complete HTTP request and matching cURL command from structured fields.→HTTP Status CheckerNetworkCheck the live HTTP status of a public URL, follow redirects, and review the final response and request path.→HTTP Status Code LookupNetworkLook up common HTTP response codes and use detailed guides for 301, 302, 401, 403, 404, 429, 500, 502, and 503 errors.→Hash GeneratorGeneratorUse this free Hash Generator to create MD5, SHA-1, SHA-256, and SHA-512 hashes from text, verify exact input, and copy results online.→Hashtag ExtractorTextExtract unique hashtags from captions, notes, and campaign text in their original first-seen order.→Hreflang GeneratorSeoGenerate a reciprocal hreflang cluster as HTML link tags and a complete same-site XML sitemap, with normalized locales and optional x-default.→IP Address LookupNetworkInspect a public IPv4 or IPv6 address, reverse hostname, address version, canonical form, and forward-confirmed DNS context.→ISO 8601 Date ConverterConverterConvert ISO 8601 timestamps between UTC, Unix time, and readable date formats.→JSON CompareCompareCompare two JSON documents online, validate their syntax, normalize formatting, and highlight added, removed, changed, and unchanged lines.→JSON Diff ViewerCompareCompare two JSON documents online, validate their syntax, normalize formatting, and inspect added, removed, or changed values in a clear diff.→JSON EscapeEncode DecodeEscape quotes, backslashes, line breaks, tabs and Unicode-safe text for use inside JSON string values, API payloads and configuration files.→JSON FlattenConverterFlatten nested JSON objects and arrays into reversible $-rooted path-value pairs while preserving empty objects, empty arrays, scalar types, and array indexes.→JSON FormatterDeveloperFormat, beautify or minify JSON online with 2-space, 4-space or tab indentation, optional recursive key sorting, validation, and copy-ready output.→JSON Lines 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decimal values from mixed text while preserving their original order.→Open Graph GeneratorSeoGenerate Open Graph meta tags for rich social media previews.→OpenAPI GeneratorGeneratorGenerate an OpenAPI 3.1 document from endpoint settings and JSON request or response samples.→OpenAPI ValidatorValidatorValidate the required structure of OpenAPI 3.0 and 3.1 documents supplied as JSON or YAML.→Organization Schema GeneratorSeoGenerate Organization JSON-LD with identity, logo, contact and social profiles.→PEM FormatterEncode DecodeFormat PEM certificates and keys, validate matching boundary labels, and wrap Base64 content into standard 64-character lines.→Paragraph CounterTextCount non-empty text paragraphs separated by one or more blank lines.→Password Generator AdvancedGeneratorGenerate 1–100 secure random passwords with 8–256 characters, selectable character sets, similar-character removal, and custom exclusions.→Password Strength CheckerValidatorCheck password strength using length, character variety, repetition, sequences, and common-pattern signals while keeping the result easy to understand.→Phone Number ExtractorTextExtract likely phone numbers from mixed text while preserving their original appearance and order.→Ping TestNetworkSend ICMP echo requests to a public hostname or IP address and review packet loss and round-trip timing.→Port CheckerNetworkTest whether a TCP port on a public hostname or IP address accepts a connection and review connection timing and resolved destination.→Prefix LinesTextAdd the same prefix to every following line while preserving line order and line breaks.→Product Schema GeneratorSeoGenerate Product and Offer JSON-LD for visible product details.→Query String ParserNetworkParse a complete URL or raw query string into structured, readable JSON without changing the original input.→Quote LinesTextWrap every source line in quotation marks while preserving line order and line breaks.→RSA Key GeneratorGeneratorGenerate RSA public and 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copyable segments without manually editing repeated delimiters.→Regex Tester PRODeveloperTest regular expressions with detailed matches, named groups, offsets, line and column positions, execution timing, and highlighted previews.→Remove All SpacesTextRemove every whitespace character, including spaces, tabs, and line breaks, to create one uninterrupted string.→Remove Duplicate LinesTextKeep the first occurrence of each exact line, remove later duplicates, and preserve the original line order.→Remove Duplicate WordsTextRemove repeated words case-insensitively while keeping each first spelling and the original first-seen order.→Remove Empty LinesTextDelete blank and whitespace-only lines while preserving every populated line in its original order.→Remove Line NumbersTextRemove leading line numbers from text while preserving the remaining line content and order.→Remove NumbersTextRemove numeric digits from text while keeping letters, punctuation, spacing, and line order available for 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hexadecimal, and Base64 tokens from cryptographically secure random bytes.→TracerouteNetworkTrace the network path to a public hostname or IP address and review each responding hop and latency.→Trim WhitespaceTextRemove unwanted spaces around every line without changing the meaningful text inside each line.→Twitter Card GeneratorSeoGenerate Twitter Card metadata for link previews on X and compatible platforms.→URL DecoderEncode DecodeDecode valid percent-encoded UTF-8 text while preserving literal plus signs for accurate URL-component inspection.→URL EncoderEncode DecodePercent-encode UTF-8 text for use as one URL component while preserving JavaScript encodeURIComponent-safe characters.→URL ExtractorTextExtract web addresses from text, HTML, logs, exports, and documents for audits, migration, outreach, and review→URL ParserNetworkSplit an absolute URL into scheme, host, port, user information, path, query parameters, and fragment.→URL Query BuilderGeneratorURL Query Builder creates RFC 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Converter
Ready
JSON Unflatten
Rebuild nested JSON objects and arrays from a reversible $-rooted flat path map with collision checks, escaped property names, and strict contiguous array indexes.
Reconstruct objects from dot or slash paths Create arrays from bracket indexes Restore escaped property names Preserve typed leaf values and empty containers
Conflicting paths, mixed object/array containers, and sparse array indexes are rejected instead of being silently overwritten.
Private browser processing. Your input is processed on this device and is not sent to the Trexmi server.
INPUT Flattened JSON path map *
Paste an object produced by JSON Flatten. Paths must start with $, object segments use the selected separator, and arrays use [index]. Example: Trexmi developer sample
Reconstructed nested JSON
Inspect the restored object/array tree and copy the validated JSON.
→
Result ready
READY
Processed result
Raw output
About the tool
What JSON Unflatten does
JSON Unflatten reverses the path map generated by Trexmi JSON Flatten. A path begins with $, uses a dot or slash for object properties, and uses brackets for array indexes. The values in the flat object become leaves in the reconstructed tree.
The processor refuses ambiguous input instead of silently replacing data. A property cannot be both a scalar leaf and the parent of another path. Object properties cannot conflict with array indexes, and an array must contain every index from zero without gaps. Empty objects and arrays can be restored directly from leaf values.
How to use
- Paste the flat map. The outer document must be a JSON object, not an array.
- Match the separator. Select dot for paths such as
$.user.nameor slash for$/user/name. - Run JSON Unflatten. The tool parses escaped property segments and array indexes.
- Resolve errors. Fix ancestor conflicts, object-versus-array conflicts, invalid indexes, or missing array positions.
- Verify the result. Compare it with the expected schema and use JSON Validator before production import.
Built for the task
Why use JSON Unflatten?
Focused controls, predictable output, and a workflow designed around this exact transformation.
02
Collision protection
Stop when one path would overwrite another path or change a container type.
03
Escaped keys decoded
Restore property names that contain separators, brackets, or backslashes.
04
Valid JSON output
Serialize the completed tree as readable JSON only after all paths pass structural checks.
Useful answers
Questions about JSON Unflatten
Practical details about input, output, privacy, limits, and the best way to use this tool.
01 What input does JSON Unflatten require?
The input must be a JSON object whose property names follow the Trexmi $-rooted flat-path grammar and whose property values are the leaves to restore.
02 Must I use the same separator as JSON Flatten?
Yes. Selecting slash for dot paths or dot for slash paths changes how object-property boundaries are parsed.
03 How does JSON Unflatten know an array from an object?
Bracket tokens such as [0] create arrays. Separator-prefixed segments such as .0 create object properties, even when the property name contains digits.
04 Why are sparse arrays rejected?
JSON arrays are ordered sequences. Rejecting a map that begins at index 2 avoids silently adding null values or serializing the structure as an object.
05 Can a flat map contain only the $ path?
Yes. This is how a root scalar, null, empty array, or empty object is represented. The root path cannot be combined with child paths.
06 What is a path collision?
A collision occurs when one path is an ancestor of another leaf or when the same container must be both an object and an array. The operation stops before overwriting either value.
07 Is the path syntax JSON Pointer?
No. Trexmi uses its own reversible dot-or-slash grammar with bracketed array indexes. JSON Pointer uses a different slash syntax and different escaping rules.
08 Does successful reconstruction prove the data is valid for my API?
No. The result is syntactically valid JSON, but required fields, value formats, allowed enums, and business rules still need schema or application validation.
Learn JSON
Read the complete JSON Guide
Learn JSON objects, arrays, value types, validation, formatting, parsing, API workflows, and common syntax errors.
- Objects, arrays, and values
- Validation and formatting
- API and parsing workflows
Read guide
Practical explanations and examples
Examples
Rebuild a customer object
All paths share the same object parent and scalar types remain intact.
Input
{"$.customer.id":42,"$.customer.name":"Lin","$.customer.active":true}
Output
{"customer":{"id":42,"name":"Lin","active":true}}
Rebuild an array
Contiguous zero-based indexes become a JSON array in the specified order.
Input
{"$.tags[0]":"json","$.tags[1]":"tools","$.tags[2]":"api"}
Output
{"tags":["json","tools","api"]}
Restore an escaped key
The doubled JSON backslash decodes to one path escape, so the first dot belongs to the property name.
Input
{"$.release\\.version.major":2}
Output
{"release.version":{"major":2}}
Reject an ancestor conflict
The same location cannot be both a string and an object containing another property.
Input
{"$.user":"Ada","$.user.name":"Ada Lovelace"}
Output
Error: Path conflict: an existing leaf is also an ancestor of $.user.name.
Reading $-rooted paths
Every path starts at $. The selected separator introduces an object property, and [number] introduces an array position. A backslash escapes the next character inside a property segment. The parser requires the complete path to follow this grammar; unexpected text after a root, property, or array index is reported as an error.
The safest source is output copied directly from JSON Flatten. Hand-written maps are supported, but escaping and separator choices must be consistent.
Why conflicting paths are blocked
Consider $.account with the value false and $.account.id with the value 7. Reconstructing both would require replacing the boolean with an object. Older unflatten implementations often do this silently. Trexmi detects ancestor, descendant, and container-type conflicts before returning output.
When a conflict appears, decide which source field is authoritative. Renaming paths or changing a scalar to an object is a data-model decision, not a formatting fix.
Contiguous array indexes
An array must begin at index zero and continue without gaps. A map containing [0] and [2] but no [1] is rejected. This avoids inventing a missing value. If the numeric labels are identifiers rather than positions, encode them as object properties using the selected separator.
Use JSON Pointer Tester to resolve a standardized pointer against the reconstructed output, and JSON Formatter to inspect the final document.
Limitations and validation
The tool does not infer a business schema, merge duplicate records, coerce dates, normalize numbers, or verify that a path map came from the same version of another application. Duplicate property names already collapsed by a JSON parser cannot be recovered. Input size, depth, and array-index limits protect the server from pathological documents.
Review JSON RFC 8259 for JSON syntax and interoperability. Review JSON Pointer RFC 6901 when another system explicitly requires standard pointer syntax instead of this flat-map convention.
Final checks
Run the reconstructed document through JSON Validator, then validate it against the receiving API or database schema.