JSMN
Jsmn is a world fastest JSON parser/tokenizer. This is the official repo replacing the old one at Bitbucket (by zserge)
ArduinoJson
📟 JSON library for Arduino and embedded C++. Simple and efficient. (by bblanchon)
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JSMN | ArduinoJson | |
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14 | 24 | |
3,547 | 6,548 | |
- | - | |
0.0 | 9.0 | |
about 1 month ago | 2 days ago | |
C | C++ | |
MIT License | MIT License |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
JSMN
Posts with mentions or reviews of JSMN.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-11-05.
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Building a high performance JSON parser
Like how https://github.com/zserge/jsmn works. I thought it would be neat to have such as parser for https://github.com/vshymanskyy/muon
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Flattening ASTs (and Other Compiler Data Structures)
One more JSON implementation using this approach is https://github.com/zserge/jsmn.
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Show HN: WinGPT, AI Assistant for Windows 3.1
Yep! I'm using JSMN (https://github.com/zserge/jsmn), which is a streaming parser that visits each token sequentially, so there's only one copy of each JSON response in memory. I also avoid allocating new intermediate memory whenever possible; for example, to unescape backslashes in the JSON strings, I use a destructive loop that moves the non-backslash characters forward in memory, and truncates the string by moving the null terminator earlier in the string. Not something I'd imagine doing in most environments today, but as you said, it saves a bit of space at the expense of CPU time :)
void DestructivelyUnescapeStr(LPSTR lpInput) {
- A good C library to parse json data
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Lightweight data serialization/deserialization format
After reviewing several options, I’ve settled on plain old JSON. For parsing, I use https://github.com/zserge/jsmn. For serialization I use https://github.com/rdpoor/jems (disclaimer: I wrote the latter, but others use it as well).
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jemi: a compact JSON serializer for embedded systems
As mentioned here, it appears that tiny-json is a parser, not a serializer. If you're looking for parsers, I've been very happy with jsmn.
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What is the proper way to store a RFC3339 date string?
Very small, 4-5 fields but I'm still going to write in binary because I'm trying to reduce dependencies and https://github.com/zserge/jsmn looks like good fit but jsmn only does parsing which I need for parsing some Oauth json data and config.json file. I will be able to dump the state struct in a state.bin file and read it later for comparing it with system time. Not having to write in text fits well for this particular use case. Benefits: Reduced dependencies and almost cost less decoding of the state struct(which the user will never see).
- Jsmn: A minimalistic JSON parser in C
- CJSON – Ultralightweight JSON parser in ANSI C
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A tiny zero-allocation JSON serializer compatible with C89!
This is my very straight-forward implementation that came to be from the lack of JSON encoding in jsmn:
ArduinoJson
Posts with mentions or reviews of ArduinoJson.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2022-12-22.
- How can I obtain weather info?
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Creating Pixel Art with Web Interface using ESP8266
I'm using the library ArduinoJson to storage arts in the ESP8266 memory at JSON format. But, i'm have difficult to storage more than 4 drawings, possibly because i don't know how scale, optimize and manager the memory space.
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Question regarding ArduinoJson.h Connection
/******************************************************************* A sample project for making a HTTP/HTTPS GET request on an ESP32 and parsing it from JSON It will connect to the given request, parse the JSON and print the body to serial monitor Parts: ESP32 Dev Board Aliexpress: * - https://s.click.aliexpress.com/e/_dSi824B Amazon: * - https://amzn.to/3gArkAY * * = Affilate If you find what I do useful and would like to support me, please consider becoming a sponsor on Github https://github.com/sponsors/witnessmenow/ Written by Brian Lough YouTube: https://www.youtube.com/brianlough Tindie: https://www.tindie.com/stores/brianlough/ Twitter: https://twitter.com/witnessmenow *******************************************************************/ // ---------------------------- // Standard Libraries // ---------------------------- #include #include // ---------------------------- // Additional Libraries - each one of these will need to be installed. // ---------------------------- #include // Library used for parsing Json from the API responses // Search for "Arduino Json" in the Arduino Library manager // https://github.com/bblanchon/ArduinoJson //------- Replace the following! ------ char ssid[] = "yourSSID"; // your network SSID (name) char password[] = "yourPassword"; // your network key // For Non-HTTPS requests // WiFiClient client; // For HTTPS requests WiFiClientSecure client; // Just the base of the URL you want to connect to #define TEST_HOST "api.openweathermap.org" // Root cert of server we are connecting to // Baltimore CyberTrust Root - Expires 12 May 2025 // (FYI, from a security point of view you should not trust certs from other people, including me!) /*const char *server_cert = "-----BEGIN CERTIFICATE-----\n" "MIIDdzCCAl+gAwIBAgIEAgAAuTANBgkqhkiG9w0BAQUFADBaMQswCQYDVQQGEwJJ\n" "RTESMBAGA1UEChMJQmFsdGltb3JlMRMwEQYDVQQLEwpDeWJlclRydXN0MSIwIAYD\n" "VQQDExlCYWx0aW1vcmUgQ3liZXJUcnVzdCBSb290MB4XDTAwMDUxMjE4NDYwMFoX\n" "DTI1MDUxMjIzNTkwMFowWjELMAkGA1UEBhMCSUUxEjAQBgNVBAoTCUJhbHRpbW9y\n" "ZTETMBEGA1UECxMKQ3liZXJUcnVzdDEiMCAGA1UEAxMZQmFsdGltb3JlIEN5YmVy\n" "VHJ1c3QgUm9vdDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAKMEuyKr\n" "mD1X6CZymrV51Cni4eiVgLGw41uOKymaZN+hXe2wCQVt2yguzmKiYv60iNoS6zjr\n" "IZ3AQSsBUnuId9Mcj8e6uYi1agnnc+gRQKfRzMpijS3ljwumUNKoUMMo6vWrJYeK\n" "mpYcqWe4PwzV9/lSEy/CG9VwcPCPwBLKBsua4dnKM3p31vjsufFoREJIE9LAwqSu\n" "XmD+tqYF/LTdB1kC1FkYmGP1pWPgkAx9XbIGevOF6uvUA65ehD5f/xXtabz5OTZy\n" "dc93Uk3zyZAsuT3lySNTPx8kmCFcB5kpvcY67Oduhjprl3RjM71oGDHweI12v/ye\n" "jl0qhqdNkNwnGjkCAwEAAaNFMEMwHQYDVR0OBBYEFOWdWTCCR1jMrPoIVDaGezq1\n" "BE3wMBIGA1UdEwEB/wQIMAYBAf8CAQMwDgYDVR0PAQH/BAQDAgEGMA0GCSqGSIb3\n" "DQEBBQUAA4IBAQCFDF2O5G9RaEIFoN27TyclhAO992T9Ldcw46QQF+vaKSm2eT92\n" "9hkTI7gQCvlYpNRhcL0EYWoSihfVCr3FvDB81ukMJY2GQE/szKN+OMY3EU/t3Wgx\n" "jkzSswF07r51XgdIGn9w/xZchMB5hbgF/X++ZRGjD8ACtPhSNzkE1akxehi/oCr0\n" "Epn3o0WC4zxe9Z2etciefC7IpJ5OCBRLbf1wbWsaY71k5h+3zvDyny67G7fyUIhz\n" "ksLi4xaNmjICq44Y3ekQEe5+NauQrz4wlHrQMz2nZQ/1/I6eYs9HRCwBXbsdtTLS\n" "R9I4LtD+gdwyah617jzV/OeBHRnDJELqYzmp\n" "-----END CERTIFICATE-----\n"; */ void setup() { Serial.begin(115200); // Connect to the WiFI WiFi.mode(WIFI_STA); WiFi.begin(ssid, password); Serial.println(""); // Wait for connection while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.print("Connected to "); Serial.println(ssid); Serial.print("IP address: "); Serial.println(WiFi.localIP()); //-------- // Checking the cert is the best way on an ESP32 // This will verify the server is trusted. //client.setCACert(server_cert); // If you don't want to verify the server // Unlike the fingerprint method of the ESP8266 which expires frequently // the cert lasts years, so I don't see much reason to ever // use this on the ESP32 client.setInsecure(); } void makeHTTPRequest() { // Opening connection to server (Use 80 as port if HTTP) if (!client.connect(TEST_HOST, 443)) { Serial.println(F("Connection failed")); return; } // give the esp a breather yield(); // Send HTTP request client.print(F("GET ")); // This is the second half of a request (everything that comes after the base URL) client.print("/data/2.5/weather?q=London, UK&appid=[yourOpenWeatherAPI]&units=metric"); // %2C == , client.println(F(" HTTP/1.1")); //Headers client.print(F("Host: ")); client.println(TEST_HOST); client.println(F("Cache-Control: no-cache")); if (client.println() == 0) { Serial.println(F("Failed to send request")); return; } //delay(100); // Check HTTP status char status[32] = {0}; client.readBytesUntil('\r', status, sizeof(status)); if (strcmp(status, "HTTP/1.1 200 OK") != 0) { Serial.print(F("Unexpected response: ")); Serial.println(status); return; } // Skip HTTP headers char endOfHeaders[] = "\r\n\r\n"; if (!client.find(endOfHeaders)) { Serial.println(F("Invalid response")); return; } // This is probably not needed for most, but I had issues // with the Tindie api where sometimes there were random // characters coming back before the body of the response. // This will cause no hard to leave it in // peek() will look at the character, but not take it off the queue while (client.available() && client.peek() != '{') { char c = 0; client.readBytes(&c, 1); Serial.print(c); Serial.println("BAD"); } // // While the client is still availble read each // // byte and print to the serial monitor // while (client.available()) { // char c = 0; // client.readBytes(&c, 1); // Serial.print(c); // } //Use the ArduinoJson Assistant to calculate this: //StaticJsonDocument<192> doc; DynamicJsonDocument doc(1024); //For ESP32/ESP8266 you'll mainly use dynamic. DeserializationError error = deserializeJson(doc, client); if (!error) { float coord_lon = doc["coord"]["lon"]; float coord_lat = doc["coord"]["lat"]; JsonObject main = doc["main"]; float main_temp = main["temp"]; Serial.print("Temp: "); Serial.println(main_temp); Serial.print("Longitude: "); Serial.println(coord_lon); Serial.print("Latitude: "); Serial.println(coord_lat); } else { Serial.print(F("deserializeJson() failed: ")); Serial.println(error.f_str()); return; } } void loop() { makeHTTPRequest(); delay(1500); }
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Converting an array of byte characters from an API into bytes using ArduinoJSON?
I've logged a github issue, but I'm not convinced I've asked the right questions as I've never had to do anything like this before - am I missing something obvious?
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Sending arrays through serial line between 2 arduinos
https://arduinojson.org
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[looking for help] Config File in SD Card
Also, if you want a nice way to encapsulate data, look at ArduinoJson (https://arduinojson.org/). All your information can be stored as easily identifiable strings in a JSON format. I use it all the time and it removes a lot of the mucking about with figuring out how to parse your data to/from file.
- ESP32 HTML e-Paper
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Gamepad app with analog Joystick mode for your ESP32 projects to control your Robots using Websockets.
The format is simple JSON data and self explanatory, no binary coding, just simple text, which you can decode using https://arduinojson.org/.
- #Beguiner how can i fill my json structure from an online or off life tool
- Easiest method to get somewhat large array of information off an ESP8266
What are some alternatives?
When comparing JSMN and ArduinoJson you can also consider the following projects:
cJSON - Ultralightweight JSON parser in ANSI C
json-c - https://github.com/json-c/json-c is the official code repository for json-c. See the wiki for release tarballs for download. API docs at http://json-c.github.io/json-c/
esp-idf-json - Example of JSON Serialize and Deserialize in ESP-IDF
Jansson - C library for encoding, decoding and manipulating JSON data
yaml-cpp - A YAML parser and emitter in C++
RapidJSON - A fast JSON parser/generator for C++ with both SAX/DOM style API
json - JSON for Modern C++
yyjson - The fastest JSON library in C
FlatBuffers - FlatBuffers: Memory Efficient Serialization Library